v3.26.1
Shareholder Report
6 Months Ended
Apr. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Transamerica Funds
Entity Central Index Key 0000787623
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000093288  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Cap Value
Class Name Class A
Trading Symbol TWQAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$49
0.94%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.94% [1]
AssetsNet $ 2,479,048,036
Holdings Count | Holding 46
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$2,479,048,036
Number of Portfolio Holdings
46
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
19.2%
 
Financials
17.7
 
Health Care
11.5
 
Communication Services
10.6
 
Consumer Discretionary
9.4
 
Information Technology
8.0
 
Materials
6.0
 
Energy
5.7
 
Consumer Staples
3.4
 
Real Estate
2.8
 
Utilities
1.7
Repurchase Agreements
2.3
Net Other Assets (Liabilities)Footnote Reference^
1.7
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
4.9%
Micron Technology, Inc.
3.8
Exxon Mobil Corp.
3.7
JPMorgan Chase & Co.
3.6
Amazon.com, Inc.
3.3
Quanta Services, Inc.
3.0
Wells Fargo & Co.
2.7
Blackrock, Inc.
2.6
RTX Corp.
2.6
Linde PLC
2.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000093289  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Cap Value
Class Name Class C
Trading Symbol TWQCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$89
1.69%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 89
Expense Ratio, Percent 1.69% [2]
AssetsNet $ 2,479,048,036
Holdings Count | Holding 46
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$2,479,048,036
Number of Portfolio Holdings
46
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
19.2%
 
Financials
17.7
 
Health Care
11.5
 
Communication Services
10.6
 
Consumer Discretionary
9.4
 
Information Technology
8.0
 
Materials
6.0
 
Energy
5.7
 
Consumer Staples
3.4
 
Real Estate
2.8
 
Utilities
1.7
Repurchase Agreements
2.3
Net Other Assets (Liabilities)Footnote Reference^
1.7
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
4.9%
Micron Technology, Inc.
3.8
Exxon Mobil Corp.
3.7
JPMorgan Chase & Co.
3.6
Amazon.com, Inc.
3.3
Quanta Services, Inc.
3.0
Wells Fargo & Co.
2.7
Blackrock, Inc.
2.6
RTX Corp.
2.6
Linde PLC
2.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000093290  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Cap Value
Class Name Class I
Trading Symbol TWQIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$33
0.63%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.63% [3]
AssetsNet $ 2,479,048,036
Holdings Count | Holding 46
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$2,479,048,036
Number of Portfolio Holdings
46
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
19.2%
 
Financials
17.7
 
Health Care
11.5
 
Communication Services
10.6
 
Consumer Discretionary
9.4
 
Information Technology
8.0
 
Materials
6.0
 
Energy
5.7
 
Consumer Staples
3.4
 
Real Estate
2.8
 
Utilities
1.7
Repurchase Agreements
2.3
Net Other Assets (Liabilities)Footnote Reference^
1.7
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
4.9%
Micron Technology, Inc.
3.8
Exxon Mobil Corp.
3.7
JPMorgan Chase & Co.
3.6
Amazon.com, Inc.
3.3
Quanta Services, Inc.
3.0
Wells Fargo & Co.
2.7
Blackrock, Inc.
2.6
RTX Corp.
2.6
Linde PLC
2.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000093291  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Cap Value
Class Name Class I2
Trading Symbol TWQZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$33
0.62%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.62% [4]
AssetsNet $ 2,479,048,036
Holdings Count | Holding 46
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$2,479,048,036
Number of Portfolio Holdings
46
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
19.2%
 
Financials
17.7
 
Health Care
11.5
 
Communication Services
10.6
 
Consumer Discretionary
9.4
 
Information Technology
8.0
 
Materials
6.0
 
Energy
5.7
 
Consumer Staples
3.4
 
Real Estate
2.8
 
Utilities
1.7
Repurchase Agreements
2.3
Net Other Assets (Liabilities)Footnote Reference^
1.7
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
4.9%
Micron Technology, Inc.
3.8
Exxon Mobil Corp.
3.7
JPMorgan Chase & Co.
3.6
Amazon.com, Inc.
3.3
Quanta Services, Inc.
3.0
Wells Fargo & Co.
2.7
Blackrock, Inc.
2.6
RTX Corp.
2.6
Linde PLC
2.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000156757  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Cap Value
Class Name Class R6
Trading Symbol TALCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$33
0.62%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.62% [5]
AssetsNet $ 2,479,048,036
Holdings Count | Holding 46
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$2,479,048,036
Number of Portfolio Holdings
46
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
19.2%
 
Financials
17.7
 
Health Care
11.5
 
Communication Services
10.6
 
Consumer Discretionary
9.4
 
Information Technology
8.0
 
Materials
6.0
 
Energy
5.7
 
Consumer Staples
3.4
 
Real Estate
2.8
 
Utilities
1.7
Repurchase Agreements
2.3
Net Other Assets (Liabilities)Footnote Reference^
1.7
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
4.9%
Micron Technology, Inc.
3.8
Exxon Mobil Corp.
3.7
JPMorgan Chase & Co.
3.6
Amazon.com, Inc.
3.3
Quanta Services, Inc.
3.0
Wells Fargo & Co.
2.7
Blackrock, Inc.
2.6
RTX Corp.
2.6
Linde PLC
2.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000241382  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Core ESG
Class Name Class A
Trading Symbol TLACX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$49
0.96%Footnote Reference*Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.96% [6],[7]
AssetsNet $ 172,684,818
Holdings Count | Holding 127
InvestmentCompanyPortfolioTurnover 53.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$172,684,818
Number of Portfolio Holdings
127
Portfolio Turnover Rate
53%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
35.6%
 
Financials
12.9
 
Communication Services
10.0
 
Industrials
9.9
 
Consumer Discretionary
8.7
 
Health Care
8.4
 
Energy
4.0
 
Consumer Staples
3.9
 
Materials
2.5
 
Utilities
2.3
 
Real Estate
0.9
Exchange-Traded Funds
0.7
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.0)Footnote Reference*
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
8.8%
Microsoft Corp.
5.9
Apple, Inc.
5.3
Broadcom, Inc.
3.8
Alphabet, Inc., Class A
3.1
Amazon.com, Inc.
3.0
JPMorgan Chase & Co.
2.3
Alphabet, Inc., Class C
2.2
Eli Lilly & Co.
1.9
Visa, Inc., Class A
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171801  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Core ESG
Class Name Class I3
Trading Symbol TLATX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I3
$28
0.55%Footnote Reference*Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.55% [8],[9]
AssetsNet $ 172,684,818
Holdings Count | Holding 127
InvestmentCompanyPortfolioTurnover 53.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$172,684,818
Number of Portfolio Holdings
127
Portfolio Turnover Rate
53%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
35.6%
 
Financials
12.9
 
Communication Services
10.0
 
Industrials
9.9
 
Consumer Discretionary
8.7
 
Health Care
8.4
 
Energy
4.0
 
Consumer Staples
3.9
 
Materials
2.5
 
Utilities
2.3
 
Real Estate
0.9
Exchange-Traded Funds
0.7
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.0)Footnote Reference*
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
8.8%
Microsoft Corp.
5.9
Apple, Inc.
5.3
Broadcom, Inc.
3.8
Alphabet, Inc., Class A
3.1
Amazon.com, Inc.
3.0
JPMorgan Chase & Co.
2.3
Alphabet, Inc., Class C
2.2
Eli Lilly & Co.
1.9
Visa, Inc., Class A
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171799  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Core ESG
Class Name Class R
Trading Symbol TLARX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R
$53
1.05%Footnote Reference*Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 53
Expense Ratio, Percent 1.05% [10],[11]
AssetsNet $ 172,684,818
Holdings Count | Holding 127
InvestmentCompanyPortfolioTurnover 53.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$172,684,818
Number of Portfolio Holdings
127
Portfolio Turnover Rate
53%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
35.6%
 
Financials
12.9
 
Communication Services
10.0
 
Industrials
9.9
 
Consumer Discretionary
8.7
 
Health Care
8.4
 
Energy
4.0
 
Consumer Staples
3.9
 
Materials
2.5
 
Utilities
2.3
 
Real Estate
0.9
Exchange-Traded Funds
0.7
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.0)Footnote Reference*
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
8.8%
Microsoft Corp.
5.9
Apple, Inc.
5.3
Broadcom, Inc.
3.8
Alphabet, Inc., Class A
3.1
Amazon.com, Inc.
3.0
JPMorgan Chase & Co.
2.3
Alphabet, Inc., Class C
2.2
Eli Lilly & Co.
1.9
Visa, Inc., Class A
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171800  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Core ESG
Class Name Class R4
Trading Symbol TLAFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R4
$41
0.81%Footnote Reference*Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.81% [12],[13]
AssetsNet $ 172,684,818
Holdings Count | Holding 127
InvestmentCompanyPortfolioTurnover 53.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$172,684,818
Number of Portfolio Holdings
127
Portfolio Turnover Rate
53%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
35.6%
 
Financials
12.9
 
Communication Services
10.0
 
Industrials
9.9
 
Consumer Discretionary
8.7
 
Health Care
8.4
 
Energy
4.0
 
Consumer Staples
3.9
 
Materials
2.5
 
Utilities
2.3
 
Real Estate
0.9
Exchange-Traded Funds
0.7
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.0)Footnote Reference*
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
8.8%
Microsoft Corp.
5.9
Apple, Inc.
5.3
Broadcom, Inc.
3.8
Alphabet, Inc., Class A
3.1
Amazon.com, Inc.
3.0
JPMorgan Chase & Co.
2.3
Alphabet, Inc., Class C
2.2
Eli Lilly & Co.
1.9
Visa, Inc., Class A
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000241383  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Core ESG
Class Name Class R6
Trading Symbol TLASX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$28
0.55%Footnote Reference*Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.55% [14],[15]
AssetsNet $ 172,684,818
Holdings Count | Holding 127
InvestmentCompanyPortfolioTurnover 53.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$172,684,818
Number of Portfolio Holdings
127
Portfolio Turnover Rate
53%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
35.6%
 
Financials
12.9
 
Communication Services
10.0
 
Industrials
9.9
 
Consumer Discretionary
8.7
 
Health Care
8.4
 
Energy
4.0
 
Consumer Staples
3.9
 
Materials
2.5
 
Utilities
2.3
 
Real Estate
0.9
Exchange-Traded Funds
0.7
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.0)Footnote Reference*
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
8.8%
Microsoft Corp.
5.9
Apple, Inc.
5.3
Broadcom, Inc.
3.8
Alphabet, Inc., Class A
3.1
Amazon.com, Inc.
3.0
JPMorgan Chase & Co.
2.3
Alphabet, Inc., Class C
2.2
Eli Lilly & Co.
1.9
Visa, Inc., Class A
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171804  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Growth
Class Name Class I3
Trading Symbol TGWTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I3
$34
0.72%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.72% [16]
AssetsNet $ 343,806,156
Holdings Count | Holding 83
InvestmentCompanyPortfolioTurnover 17.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$343,806,156
Number of Portfolio Holdings
83
Portfolio Turnover Rate
17%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
45.5%
 
Consumer Discretionary
14.5
 
Health Care
10.7
 
Communication Services
10.3
 
Financials
7.5
 
Industrials
5.6
 
Consumer Staples
0.9
 
Materials
0.5
 
Real Estate
0.4
 
Energy
0.1
Repurchase Agreements
4.4
Other Investment Company
1.9
Purchased Options
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
(2.3)
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Cloudflare, Inc., Class A
6.6%
NVIDIA Corp.
6.3
Tesla, Inc.
5.2
Apple, Inc.
4.5
Alphabet, Inc., Class A
4.4
Royalty Pharma PLC, Class A
3.8
Broadcom, Inc.
3.4
Microsoft Corp.
3.2
Amazon.com, Inc.
3.2
AppLovin Corp., Class A
3.0
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171802  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Growth
Class Name Class R
Trading Symbol TGWRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R
$57
1.21%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 57
Expense Ratio, Percent 1.21% [17]
AssetsNet $ 343,806,156
Holdings Count | Holding 83
InvestmentCompanyPortfolioTurnover 17.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$343,806,156
Number of Portfolio Holdings
83
Portfolio Turnover Rate
17%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
45.5%
 
Consumer Discretionary
14.5
 
Health Care
10.7
 
Communication Services
10.3
 
Financials
7.5
 
Industrials
5.6
 
Consumer Staples
0.9
 
Materials
0.5
 
Real Estate
0.4
 
Energy
0.1
Repurchase Agreements
4.4
Other Investment Company
1.9
Purchased Options
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
(2.3)
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Cloudflare, Inc., Class A
6.6%
NVIDIA Corp.
6.3
Tesla, Inc.
5.2
Apple, Inc.
4.5
Alphabet, Inc., Class A
4.4
Royalty Pharma PLC, Class A
3.8
Broadcom, Inc.
3.4
Microsoft Corp.
3.2
Amazon.com, Inc.
3.2
AppLovin Corp., Class A
3.0
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171803  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Growth
Class Name Class R4
Trading Symbol TGWFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R4
$43
0.90%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.90% [18]
AssetsNet $ 343,806,156
Holdings Count | Holding 83
InvestmentCompanyPortfolioTurnover 17.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$343,806,156
Number of Portfolio Holdings
83
Portfolio Turnover Rate
17%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
45.5%
 
Consumer Discretionary
14.5
 
Health Care
10.7
 
Communication Services
10.3
 
Financials
7.5
 
Industrials
5.6
 
Consumer Staples
0.9
 
Materials
0.5
 
Real Estate
0.4
 
Energy
0.1
Repurchase Agreements
4.4
Other Investment Company
1.9
Purchased Options
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
(2.3)
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Cloudflare, Inc., Class A
6.6%
NVIDIA Corp.
6.3
Tesla, Inc.
5.2
Apple, Inc.
4.5
Alphabet, Inc., Class A
4.4
Royalty Pharma PLC, Class A
3.8
Broadcom, Inc.
3.4
Microsoft Corp.
3.2
Amazon.com, Inc.
3.2
AppLovin Corp., Class A
3.0
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000228030  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Growth
Class Name Class R6
Trading Symbol TAGDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$34
0.72%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.72% [19]
AssetsNet $ 343,806,156
Holdings Count | Holding 83
InvestmentCompanyPortfolioTurnover 17.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$343,806,156
Number of Portfolio Holdings
83
Portfolio Turnover Rate
17%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
45.5%
 
Consumer Discretionary
14.5
 
Health Care
10.7
 
Communication Services
10.3
 
Financials
7.5
 
Industrials
5.6
 
Consumer Staples
0.9
 
Materials
0.5
 
Real Estate
0.4
 
Energy
0.1
Repurchase Agreements
4.4
Other Investment Company
1.9
Purchased Options
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
(2.3)
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Cloudflare, Inc., Class A
6.6%
NVIDIA Corp.
6.3
Tesla, Inc.
5.2
Apple, Inc.
4.5
Alphabet, Inc., Class A
4.4
Royalty Pharma PLC, Class A
3.8
Broadcom, Inc.
3.4
Microsoft Corp.
3.2
Amazon.com, Inc.
3.2
AppLovin Corp., Class A
3.0
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171807  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Value Opportunities
Class Name Class I3
Trading Symbol TLOTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I3
$27
0.52%Footnote Reference*Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.52% [20],[21]
AssetsNet $ 226,728,972
Holdings Count | Holding 162
InvestmentCompanyPortfolioTurnover 56.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$226,728,972
Number of Portfolio Holdings
162
Portfolio Turnover Rate
56%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
18.9%
 
Communication Services
15.7
 
Information Technology
14.5
 
Industrials
12.2
 
Health Care
9.8
 
Consumer Staples
9.0
 
Energy
5.9
 
Consumer Discretionary
4.7
 
Utilities
3.8
 
Real Estate
2.3
 
Materials
1.5
Exchange-Traded Funds
1.4
Repurchase Agreements
0.3
Net Other Assets (Liabilities)Footnote Reference^
0.0Footnote Reference*
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
7.3%
Meta Platforms, Inc., Class A
4.4
JPMorgan Chase & Co.
3.6
Exxon Mobil Corp.
2.3
Bank of America Corp.
2.1
Procter & Gamble Co.
1.8
Micron Technology, Inc.
1.8
PepsiCo, Inc.
1.6
Goldman Sachs Group, Inc.
1.6
McDonald's Corp.
1.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171805  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Value Opportunities
Class Name Class R
Trading Symbol TLORX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R
$51
1.00%Footnote Reference*Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 51
Expense Ratio, Percent 1.00% [22],[23]
AssetsNet $ 226,728,972
Holdings Count | Holding 162
InvestmentCompanyPortfolioTurnover 56.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$226,728,972
Number of Portfolio Holdings
162
Portfolio Turnover Rate
56%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
18.9%
 
Communication Services
15.7
 
Information Technology
14.5
 
Industrials
12.2
 
Health Care
9.8
 
Consumer Staples
9.0
 
Energy
5.9
 
Consumer Discretionary
4.7
 
Utilities
3.8
 
Real Estate
2.3
 
Materials
1.5
Exchange-Traded Funds
1.4
Repurchase Agreements
0.3
Net Other Assets (Liabilities)Footnote Reference^
0.0Footnote Reference*
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
7.3%
Meta Platforms, Inc., Class A
4.4
JPMorgan Chase & Co.
3.6
Exxon Mobil Corp.
2.3
Bank of America Corp.
2.1
Procter & Gamble Co.
1.8
Micron Technology, Inc.
1.8
PepsiCo, Inc.
1.6
Goldman Sachs Group, Inc.
1.6
McDonald's Corp.
1.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171806  
Shareholder Report [Line Items]  
Fund Name Transamerica Large Value Opportunities
Class Name Class R4
Trading Symbol TLOFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R4
$39
0.75%Footnote Reference*Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.75% [24],[25]
AssetsNet $ 226,728,972
Holdings Count | Holding 162
InvestmentCompanyPortfolioTurnover 56.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$226,728,972
Number of Portfolio Holdings
162
Portfolio Turnover Rate
56%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
18.9%
 
Communication Services
15.7
 
Information Technology
14.5
 
Industrials
12.2
 
Health Care
9.8
 
Consumer Staples
9.0
 
Energy
5.9
 
Consumer Discretionary
4.7
 
Utilities
3.8
 
Real Estate
2.3
 
Materials
1.5
Exchange-Traded Funds
1.4
Repurchase Agreements
0.3
Net Other Assets (Liabilities)Footnote Reference^
0.0Footnote Reference*
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
7.3%
Meta Platforms, Inc., Class A
4.4
JPMorgan Chase & Co.
3.6
Exxon Mobil Corp.
2.3
Bank of America Corp.
2.1
Procter & Gamble Co.
1.8
Micron Technology, Inc.
1.8
PepsiCo, Inc.
1.6
Goldman Sachs Group, Inc.
1.6
McDonald's Corp.
1.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000241763  
Shareholder Report [Line Items]  
Fund Name Transamerica Long Credit
Class Name Class A
Trading Symbol TLCDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$42
0.86%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.86% [26]
AssetsNet $ 157,396,999
Holdings Count | Holding 282
InvestmentCompanyPortfolioTurnover 18.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$157,396,999
Number of Portfolio Holdings
282
Portfolio Turnover Rate
18%
Average MaturityFootnote Reference§
23.16 years
DurationFootnote Reference
11.88 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
86.7%
U.S. Government Obligations
5.0
Foreign Government Obligations
3.0
Asset-Backed Securities
2.4
Repurchase Agreements
1.1
Other Investment Company
0.7
U.S. Government Agency Obligations
0.5
Municipal Government Obligations
0.3
Net Other Assets (Liabilities)Footnote Reference^
0.3
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
5.5%
AAA
2.6
AA
5.8
A
29.1
BBB
53.0
BB
1.7
B
0.2
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
JG Wentworth XLIII LLC, Series 2019-1A, Class A, 3.82%, 08/17/2071
1.7%
U.S. Treasury Bonds, 4.63%, 11/15/2045
1.4
Charter Communications Operating LLC/Charter Communications Operating Capital, 6.48%, 10/23/2045
1.2
JPMorgan Chase & Co. Fixed until 04/22/2040, 3.11%, 04/22/2041
1.0
U.S. Treasury Inflation-Protected Indexed Bonds, 1.50%, 02/15/2053
1.0
U.S. Treasury Bonds, 1.25%, 05/15/2050
1.0
Oracle Corp., 6.90%, 11/09/2052
1.0
Bank of America Corp. Fixed until 02/06/2036, 5.05%, 02/06/2037
1.0
Virginia Electric & Power Co., 8.88%, 11/15/2038
1.0
AT&T, Inc., 3.55%, 09/15/2055
0.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000241761  
Shareholder Report [Line Items]  
Fund Name Transamerica Long Credit
Class Name Class I
Trading Symbol TLCJX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$32
0.65%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.65% [27]
AssetsNet $ 157,396,999
Holdings Count | Holding 282
InvestmentCompanyPortfolioTurnover 18.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$157,396,999
Number of Portfolio Holdings
282
Portfolio Turnover Rate
18%
Average MaturityFootnote Reference§
23.16 years
DurationFootnote Reference
11.88 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
86.7%
U.S. Government Obligations
5.0
Foreign Government Obligations
3.0
Asset-Backed Securities
2.4
Repurchase Agreements
1.1
Other Investment Company
0.7
U.S. Government Agency Obligations
0.5
Municipal Government Obligations
0.3
Net Other Assets (Liabilities)Footnote Reference^
0.3
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
5.5%
AAA
2.6
AA
5.8
A
29.1
BBB
53.0
BB
1.7
B
0.2
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
JG Wentworth XLIII LLC, Series 2019-1A, Class A, 3.82%, 08/17/2071
1.7%
U.S. Treasury Bonds, 4.63%, 11/15/2045
1.4
Charter Communications Operating LLC/Charter Communications Operating Capital, 6.48%, 10/23/2045
1.2
JPMorgan Chase & Co. Fixed until 04/22/2040, 3.11%, 04/22/2041
1.0
U.S. Treasury Inflation-Protected Indexed Bonds, 1.50%, 02/15/2053
1.0
U.S. Treasury Bonds, 1.25%, 05/15/2050
1.0
Oracle Corp., 6.90%, 11/09/2052
1.0
Bank of America Corp. Fixed until 02/06/2036, 5.05%, 02/06/2037
1.0
Virginia Electric & Power Co., 8.88%, 11/15/2038
1.0
AT&T, Inc., 3.55%, 09/15/2055
0.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000246912  
Shareholder Report [Line Items]  
Fund Name Transamerica Long Credit
Class Name Class I2
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$28
0.56%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.56% [28]
AssetsNet $ 157,396,999
Holdings Count | Holding 282
InvestmentCompanyPortfolioTurnover 18.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$157,396,999
Number of Portfolio Holdings
282
Portfolio Turnover Rate
18%
Average MaturityFootnote Reference§
23.16 years
DurationFootnote Reference
11.88 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
86.7%
U.S. Government Obligations
5.0
Foreign Government Obligations
3.0
Asset-Backed Securities
2.4
Repurchase Agreements
1.1
Other Investment Company
0.7
U.S. Government Agency Obligations
0.5
Municipal Government Obligations
0.3
Net Other Assets (Liabilities)Footnote Reference^
0.3
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
5.5%
AAA
2.6
AA
5.8
A
29.1
BBB
53.0
BB
1.7
B
0.2
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
JG Wentworth XLIII LLC, Series 2019-1A, Class A, 3.82%, 08/17/2071
1.7%
U.S. Treasury Bonds, 4.63%, 11/15/2045
1.4
Charter Communications Operating LLC/Charter Communications Operating Capital, 6.48%, 10/23/2045
1.2
JPMorgan Chase & Co. Fixed until 04/22/2040, 3.11%, 04/22/2041
1.0
U.S. Treasury Inflation-Protected Indexed Bonds, 1.50%, 02/15/2053
1.0
U.S. Treasury Bonds, 1.25%, 05/15/2050
1.0
Oracle Corp., 6.90%, 11/09/2052
1.0
Bank of America Corp. Fixed until 02/06/2036, 5.05%, 02/06/2037
1.0
Virginia Electric & Power Co., 8.88%, 11/15/2038
1.0
AT&T, Inc., 3.55%, 09/15/2055
0.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000132301  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Growth
Class Name Class A
Trading Symbol MCGAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$60
1.22%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 60
Expense Ratio, Percent 1.22% [29]
AssetsNet $ 130,719,547
Holdings Count | Holding 36
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$130,719,547
Number of Portfolio Holdings
36
Portfolio Turnover Rate
25%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
22.5%
 
Industrials
19.9
 
Consumer Discretionary
14.2
 
Health Care
14.0
 
Financials
11.8
 
Communication Services
6.3
 
Energy
5.0
 
Utilities
3.5
 
Materials
1.8
 
Consumer Staples
0.9
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.1)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Hilton Worldwide Holdings, Inc.
7.0%
Howmet Aerospace, Inc.
6.6
Monolithic Power Systems, Inc.
5.5
Targa Resources Corp.
5.0
Clean Harbors, Inc.
4.4
Flex Ltd.
4.0
Datadog, Inc., Class A
3.6
NRG Energy, Inc.
3.4
IDEXX Laboratories, Inc.
3.4
Interactive Brokers Group, Inc., Class A
3.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000132302  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Growth
Class Name Class C
Trading Symbol MGTCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$98
1.99%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 98
Expense Ratio, Percent 1.99% [30]
AssetsNet $ 130,719,547
Holdings Count | Holding 36
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$130,719,547
Number of Portfolio Holdings
36
Portfolio Turnover Rate
25%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
22.5%
 
Industrials
19.9
 
Consumer Discretionary
14.2
 
Health Care
14.0
 
Financials
11.8
 
Communication Services
6.3
 
Energy
5.0
 
Utilities
3.5
 
Materials
1.8
 
Consumer Staples
0.9
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.1)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Hilton Worldwide Holdings, Inc.
7.0%
Howmet Aerospace, Inc.
6.6
Monolithic Power Systems, Inc.
5.5
Targa Resources Corp.
5.0
Clean Harbors, Inc.
4.4
Flex Ltd.
4.0
Datadog, Inc., Class A
3.6
NRG Energy, Inc.
3.4
IDEXX Laboratories, Inc.
3.4
Interactive Brokers Group, Inc., Class A
3.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000132303  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Growth
Class Name Class I
Trading Symbol IMCGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$45
0.92%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.92% [31]
AssetsNet $ 130,719,547
Holdings Count | Holding 36
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$130,719,547
Number of Portfolio Holdings
36
Portfolio Turnover Rate
25%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
22.5%
 
Industrials
19.9
 
Consumer Discretionary
14.2
 
Health Care
14.0
 
Financials
11.8
 
Communication Services
6.3
 
Energy
5.0
 
Utilities
3.5
 
Materials
1.8
 
Consumer Staples
0.9
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.1)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Hilton Worldwide Holdings, Inc.
7.0%
Howmet Aerospace, Inc.
6.6
Monolithic Power Systems, Inc.
5.5
Targa Resources Corp.
5.0
Clean Harbors, Inc.
4.4
Flex Ltd.
4.0
Datadog, Inc., Class A
3.6
NRG Energy, Inc.
3.4
IDEXX Laboratories, Inc.
3.4
Interactive Brokers Group, Inc., Class A
3.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000132304  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Growth
Class Name Class I2
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$41
0.82%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.82% [32]
AssetsNet $ 130,719,547
Holdings Count | Holding 36
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$130,719,547
Number of Portfolio Holdings
36
Portfolio Turnover Rate
25%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
22.5%
 
Industrials
19.9
 
Consumer Discretionary
14.2
 
Health Care
14.0
 
Financials
11.8
 
Communication Services
6.3
 
Energy
5.0
 
Utilities
3.5
 
Materials
1.8
 
Consumer Staples
0.9
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.1)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Hilton Worldwide Holdings, Inc.
7.0%
Howmet Aerospace, Inc.
6.6
Monolithic Power Systems, Inc.
5.5
Targa Resources Corp.
5.0
Clean Harbors, Inc.
4.4
Flex Ltd.
4.0
Datadog, Inc., Class A
3.6
NRG Energy, Inc.
3.4
IDEXX Laboratories, Inc.
3.4
Interactive Brokers Group, Inc., Class A
3.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171825  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Growth
Class Name Class I3
Trading Symbol TMITX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I3
$41
0.82%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.82% [33]
AssetsNet $ 130,719,547
Holdings Count | Holding 36
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$130,719,547
Number of Portfolio Holdings
36
Portfolio Turnover Rate
25%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
22.5%
 
Industrials
19.9
 
Consumer Discretionary
14.2
 
Health Care
14.0
 
Financials
11.8
 
Communication Services
6.3
 
Energy
5.0
 
Utilities
3.5
 
Materials
1.8
 
Consumer Staples
0.9
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.1)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Hilton Worldwide Holdings, Inc.
7.0%
Howmet Aerospace, Inc.
6.6
Monolithic Power Systems, Inc.
5.5
Targa Resources Corp.
5.0
Clean Harbors, Inc.
4.4
Flex Ltd.
4.0
Datadog, Inc., Class A
3.6
NRG Energy, Inc.
3.4
IDEXX Laboratories, Inc.
3.4
Interactive Brokers Group, Inc., Class A
3.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171823  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Growth
Class Name Class R
Trading Symbol TMIRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R
$65
1.32%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 65
Expense Ratio, Percent 1.32% [34]
AssetsNet $ 130,719,547
Holdings Count | Holding 36
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$130,719,547
Number of Portfolio Holdings
36
Portfolio Turnover Rate
25%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
22.5%
 
Industrials
19.9
 
Consumer Discretionary
14.2
 
Health Care
14.0
 
Financials
11.8
 
Communication Services
6.3
 
Energy
5.0
 
Utilities
3.5
 
Materials
1.8
 
Consumer Staples
0.9
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.1)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Hilton Worldwide Holdings, Inc.
7.0%
Howmet Aerospace, Inc.
6.6
Monolithic Power Systems, Inc.
5.5
Targa Resources Corp.
5.0
Clean Harbors, Inc.
4.4
Flex Ltd.
4.0
Datadog, Inc., Class A
3.6
NRG Energy, Inc.
3.4
IDEXX Laboratories, Inc.
3.4
Interactive Brokers Group, Inc., Class A
3.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171824  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Growth
Class Name Class R4
Trading Symbol TMIFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R4
$47
0.95%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.95% [35]
AssetsNet $ 130,719,547
Holdings Count | Holding 36
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$130,719,547
Number of Portfolio Holdings
36
Portfolio Turnover Rate
25%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
22.5%
 
Industrials
19.9
 
Consumer Discretionary
14.2
 
Health Care
14.0
 
Financials
11.8
 
Communication Services
6.3
 
Energy
5.0
 
Utilities
3.5
 
Materials
1.8
 
Consumer Staples
0.9
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.1)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Hilton Worldwide Holdings, Inc.
7.0%
Howmet Aerospace, Inc.
6.6
Monolithic Power Systems, Inc.
5.5
Targa Resources Corp.
5.0
Clean Harbors, Inc.
4.4
Flex Ltd.
4.0
Datadog, Inc., Class A
3.6
NRG Energy, Inc.
3.4
IDEXX Laboratories, Inc.
3.4
Interactive Brokers Group, Inc., Class A
3.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000228028  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Growth
Class Name Class R6
Trading Symbol TAGFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$41
0.82%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.82% [36]
AssetsNet $ 130,719,547
Holdings Count | Holding 36
InvestmentCompanyPortfolioTurnover 25.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$130,719,547
Number of Portfolio Holdings
36
Portfolio Turnover Rate
25%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
22.5%
 
Industrials
19.9
 
Consumer Discretionary
14.2
 
Health Care
14.0
 
Financials
11.8
 
Communication Services
6.3
 
Energy
5.0
 
Utilities
3.5
 
Materials
1.8
 
Consumer Staples
0.9
Repurchase Agreements
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.1)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Hilton Worldwide Holdings, Inc.
7.0%
Howmet Aerospace, Inc.
6.6
Monolithic Power Systems, Inc.
5.5
Targa Resources Corp.
5.0
Clean Harbors, Inc.
4.4
Flex Ltd.
4.0
Datadog, Inc., Class A
3.6
NRG Energy, Inc.
3.4
IDEXX Laboratories, Inc.
3.4
Interactive Brokers Group, Inc., Class A
3.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000140993  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Value Opportunities
Class Name Class A
Trading Symbol MCVAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$62
1.20%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 62
Expense Ratio, Percent 1.20% [37]
AssetsNet $ 807,915,844
Holdings Count | Holding 69
InvestmentCompanyPortfolioTurnover 32.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$807,915,844
Number of Portfolio Holdings
69
Portfolio Turnover Rate
32%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Health Care
15.3%
 
Consumer Staples
13.3
 
Financials
10.9
 
Communication Services
9.0
 
Industrials
7.7
 
Information Technology
7.4
 
Materials
6.6
 
Energy
6.3
 
Consumer Discretionary
6.2
 
Real Estate
5.7
 
Utilities
5.5
Repurchase Agreements
6.3
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
(0.6)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
2.6%
LKQ Corp.
2.6
U-Haul Holding Co.
2.3
Dominion Energy, Inc.
2.3
Evergy, Inc.
2.2
Graphic Packaging Holding Co.
2.2
Crown Castle, Inc.
2.2
First Citizens BancShares, Inc., Class A
2.1
SS&C Technologies Holdings, Inc.
2.1
Centene Corp.
2.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000140994  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Value Opportunities
Class Name Class C
Trading Symbol MCVCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$97
1.90%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 97
Expense Ratio, Percent 1.90% [38]
AssetsNet $ 807,915,844
Holdings Count | Holding 69
InvestmentCompanyPortfolioTurnover 32.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$807,915,844
Number of Portfolio Holdings
69
Portfolio Turnover Rate
32%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Health Care
15.3%
 
Consumer Staples
13.3
 
Financials
10.9
 
Communication Services
9.0
 
Industrials
7.7
 
Information Technology
7.4
 
Materials
6.6
 
Energy
6.3
 
Consumer Discretionary
6.2
 
Real Estate
5.7
 
Utilities
5.5
Repurchase Agreements
6.3
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
(0.6)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
2.6%
LKQ Corp.
2.6
U-Haul Holding Co.
2.3
Dominion Energy, Inc.
2.3
Evergy, Inc.
2.2
Graphic Packaging Holding Co.
2.2
Crown Castle, Inc.
2.2
First Citizens BancShares, Inc., Class A
2.1
SS&C Technologies Holdings, Inc.
2.1
Centene Corp.
2.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000140995  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Value Opportunities
Class Name Class I
Trading Symbol MVTIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$44
0.85%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.85% [39]
AssetsNet $ 807,915,844
Holdings Count | Holding 69
InvestmentCompanyPortfolioTurnover 32.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$807,915,844
Number of Portfolio Holdings
69
Portfolio Turnover Rate
32%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Health Care
15.3%
 
Consumer Staples
13.3
 
Financials
10.9
 
Communication Services
9.0
 
Industrials
7.7
 
Information Technology
7.4
 
Materials
6.6
 
Energy
6.3
 
Consumer Discretionary
6.2
 
Real Estate
5.7
 
Utilities
5.5
Repurchase Agreements
6.3
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
(0.6)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
2.6%
LKQ Corp.
2.6
U-Haul Holding Co.
2.3
Dominion Energy, Inc.
2.3
Evergy, Inc.
2.2
Graphic Packaging Holding Co.
2.2
Crown Castle, Inc.
2.2
First Citizens BancShares, Inc., Class A
2.1
SS&C Technologies Holdings, Inc.
2.1
Centene Corp.
2.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000140996  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Value Opportunities
Class Name Class I2
Trading Symbol IAAEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$39
0.76%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.76% [40]
AssetsNet $ 807,915,844
Holdings Count | Holding 69
InvestmentCompanyPortfolioTurnover 32.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$807,915,844
Number of Portfolio Holdings
69
Portfolio Turnover Rate
32%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Health Care
15.3%
 
Consumer Staples
13.3
 
Financials
10.9
 
Communication Services
9.0
 
Industrials
7.7
 
Information Technology
7.4
 
Materials
6.6
 
Energy
6.3
 
Consumer Discretionary
6.2
 
Real Estate
5.7
 
Utilities
5.5
Repurchase Agreements
6.3
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
(0.6)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
2.6%
LKQ Corp.
2.6
U-Haul Holding Co.
2.3
Dominion Energy, Inc.
2.3
Evergy, Inc.
2.2
Graphic Packaging Holding Co.
2.2
Crown Castle, Inc.
2.2
First Citizens BancShares, Inc., Class A
2.1
SS&C Technologies Holdings, Inc.
2.1
Centene Corp.
2.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171834  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Value Opportunities
Class Name Class I3
Trading Symbol TOTTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I3
$39
0.76%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.76% [41]
AssetsNet $ 807,915,844
Holdings Count | Holding 69
InvestmentCompanyPortfolioTurnover 32.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$807,915,844
Number of Portfolio Holdings
69
Portfolio Turnover Rate
32%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Health Care
15.3%
 
Consumer Staples
13.3
 
Financials
10.9
 
Communication Services
9.0
 
Industrials
7.7
 
Information Technology
7.4
 
Materials
6.6
 
Energy
6.3
 
Consumer Discretionary
6.2
 
Real Estate
5.7
 
Utilities
5.5
Repurchase Agreements
6.3
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
(0.6)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
2.6%
LKQ Corp.
2.6
U-Haul Holding Co.
2.3
Dominion Energy, Inc.
2.3
Evergy, Inc.
2.2
Graphic Packaging Holding Co.
2.2
Crown Castle, Inc.
2.2
First Citizens BancShares, Inc., Class A
2.1
SS&C Technologies Holdings, Inc.
2.1
Centene Corp.
2.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171832  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Value Opportunities
Class Name Class R
Trading Symbol TOTRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R
$64
1.25%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 64
Expense Ratio, Percent 1.25% [42]
AssetsNet $ 807,915,844
Holdings Count | Holding 69
InvestmentCompanyPortfolioTurnover 32.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$807,915,844
Number of Portfolio Holdings
69
Portfolio Turnover Rate
32%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Health Care
15.3%
 
Consumer Staples
13.3
 
Financials
10.9
 
Communication Services
9.0
 
Industrials
7.7
 
Information Technology
7.4
 
Materials
6.6
 
Energy
6.3
 
Consumer Discretionary
6.2
 
Real Estate
5.7
 
Utilities
5.5
Repurchase Agreements
6.3
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
(0.6)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
2.6%
LKQ Corp.
2.6
U-Haul Holding Co.
2.3
Dominion Energy, Inc.
2.3
Evergy, Inc.
2.2
Graphic Packaging Holding Co.
2.2
Crown Castle, Inc.
2.2
First Citizens BancShares, Inc., Class A
2.1
SS&C Technologies Holdings, Inc.
2.1
Centene Corp.
2.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171833  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Value Opportunities
Class Name Class R4
Trading Symbol TOTFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R4
$46
0.90%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.90% [43]
AssetsNet $ 807,915,844
Holdings Count | Holding 69
InvestmentCompanyPortfolioTurnover 32.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$807,915,844
Number of Portfolio Holdings
69
Portfolio Turnover Rate
32%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Health Care
15.3%
 
Consumer Staples
13.3
 
Financials
10.9
 
Communication Services
9.0
 
Industrials
7.7
 
Information Technology
7.4
 
Materials
6.6
 
Energy
6.3
 
Consumer Discretionary
6.2
 
Real Estate
5.7
 
Utilities
5.5
Repurchase Agreements
6.3
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
(0.6)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
2.6%
LKQ Corp.
2.6
U-Haul Holding Co.
2.3
Dominion Energy, Inc.
2.3
Evergy, Inc.
2.2
Graphic Packaging Holding Co.
2.2
Crown Castle, Inc.
2.2
First Citizens BancShares, Inc., Class A
2.1
SS&C Technologies Holdings, Inc.
2.1
Centene Corp.
2.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000172163  
Shareholder Report [Line Items]  
Fund Name Transamerica Mid Cap Value Opportunities
Class Name Class R6
Trading Symbol MVTRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$39
0.76%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.76% [44]
AssetsNet $ 807,915,844
Holdings Count | Holding 69
InvestmentCompanyPortfolioTurnover 32.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$807,915,844
Number of Portfolio Holdings
69
Portfolio Turnover Rate
32%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Health Care
15.3%
 
Consumer Staples
13.3
 
Financials
10.9
 
Communication Services
9.0
 
Industrials
7.7
 
Information Technology
7.4
 
Materials
6.6
 
Energy
6.3
 
Consumer Discretionary
6.2
 
Real Estate
5.7
 
Utilities
5.5
Repurchase Agreements
6.3
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
(0.6)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
2.6%
LKQ Corp.
2.6
U-Haul Holding Co.
2.3
Dominion Energy, Inc.
2.3
Evergy, Inc.
2.2
Graphic Packaging Holding Co.
2.2
Crown Castle, Inc.
2.2
First Citizens BancShares, Inc., Class A
2.1
SS&C Technologies Holdings, Inc.
2.1
Centene Corp.
2.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000137932  
Shareholder Report [Line Items]  
Fund Name Transamerica Multi-Asset Income
Class Name Class A
Trading Symbol TASHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$48
0.95%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.95% [45]
AssetsNet $ 880,492,017
Holdings Count | Holding 195
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$880,492,017
Number of Portfolio Holdings
195
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
58.4%
Corporate Debt Securities
37.1
Preferred Stocks
2.8
Other Investment Company
2.3
Repurchase Agreements
1.6
Net Other Assets (Liabilities)Footnote Reference^
(2.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class C
4.9%
Broadcom, Inc.
2.4
Apple, Inc.
2.3
Microsoft Corp.
2.2
NVIDIA Corp.
1.9
Goldman Sachs Group, Inc.
1.9
Merck & Co., Inc.
1.9
International Business Machines Corp.
1.7
Amazon.com, Inc.
1.5
Arista Networks, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000137933  
Shareholder Report [Line Items]  
Fund Name Transamerica Multi-Asset Income
Class Name Class C
Trading Symbol TCSHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$85
1.68%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 85
Expense Ratio, Percent 1.68% [46]
AssetsNet $ 880,492,017
Holdings Count | Holding 195
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$880,492,017
Number of Portfolio Holdings
195
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
58.4%
Corporate Debt Securities
37.1
Preferred Stocks
2.8
Other Investment Company
2.3
Repurchase Agreements
1.6
Net Other Assets (Liabilities)Footnote Reference^
(2.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class C
4.9%
Broadcom, Inc.
2.4
Apple, Inc.
2.3
Microsoft Corp.
2.2
NVIDIA Corp.
1.9
Goldman Sachs Group, Inc.
1.9
Merck & Co., Inc.
1.9
International Business Machines Corp.
1.7
Amazon.com, Inc.
1.5
Arista Networks, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000137934  
Shareholder Report [Line Items]  
Fund Name Transamerica Multi-Asset Income
Class Name Class I
Trading Symbol TSHIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$37
0.72%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.72% [47]
AssetsNet $ 880,492,017
Holdings Count | Holding 195
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$880,492,017
Number of Portfolio Holdings
195
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
58.4%
Corporate Debt Securities
37.1
Preferred Stocks
2.8
Other Investment Company
2.3
Repurchase Agreements
1.6
Net Other Assets (Liabilities)Footnote Reference^
(2.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class C
4.9%
Broadcom, Inc.
2.4
Apple, Inc.
2.3
Microsoft Corp.
2.2
NVIDIA Corp.
1.9
Goldman Sachs Group, Inc.
1.9
Merck & Co., Inc.
1.9
International Business Machines Corp.
1.7
Amazon.com, Inc.
1.5
Arista Networks, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000137935  
Shareholder Report [Line Items]  
Fund Name Transamerica Multi-Asset Income
Class Name Class I2
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$32
0.62%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.62% [48]
AssetsNet $ 880,492,017
Holdings Count | Holding 195
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$880,492,017
Number of Portfolio Holdings
195
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
58.4%
Corporate Debt Securities
37.1
Preferred Stocks
2.8
Other Investment Company
2.3
Repurchase Agreements
1.6
Net Other Assets (Liabilities)Footnote Reference^
(2.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class C
4.9%
Broadcom, Inc.
2.4
Apple, Inc.
2.3
Microsoft Corp.
2.2
NVIDIA Corp.
1.9
Goldman Sachs Group, Inc.
1.9
Merck & Co., Inc.
1.9
International Business Machines Corp.
1.7
Amazon.com, Inc.
1.5
Arista Networks, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021228  
Shareholder Report [Line Items]  
Fund Name Transamerica Multi-Managed Balanced
Class Name Class A
Trading Symbol IBALX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$47
0.94%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.94% [49]
AssetsNet $ 1,510,743,988
Holdings Count | Holding 672
InvestmentCompanyPortfolioTurnover 22.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,510,743,988
Number of Portfolio Holdings
672
Portfolio Turnover Rate
22%
Average MaturityFootnote Reference§
8.14 years
DurationFootnote Reference
5.74 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
61.1%
Corporate Debt Securities
13.4
U.S. Government Agency Obligations
9.3
U.S. Government Obligations
9.2
Commercial Paper
7.2
Mortgage-Backed Securities
2.8
Asset-Backed Securities
2.1
Short-Term U.S. Government Obligations
1.6
Repurchase Agreements
1.1
Foreign Government Obligations
0.3
Other Investment Company
0.3
Net Other Assets (Liabilities)Footnote Reference^
(8.4)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
18.5%
AAA
4.6
AA
0.4
A
3.4
BBB
8.5
BB
1.6
NR (Not Rated)
0.1
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
5.2%
Apple, Inc.
3.9
Microsoft Corp.
3.3
Amazon.com, Inc.
2.9
Alphabet, Inc., Class A
2.3
Broadcom, Inc.
2.1
Uniform Mortgage-Backed Security, TBA, 2.50%, 05/01/2056
1.6
Alphabet, Inc., Class C
1.5
Meta Platforms, Inc., Class A
1.4
Uniform Mortgage-Backed Security, TBA, 3.00%, 05/01/2056
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021230  
Shareholder Report [Line Items]  
Fund Name Transamerica Multi-Managed Balanced
Class Name Class C
Trading Symbol IBLLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$86
1.70%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 86
Expense Ratio, Percent 1.70% [50]
AssetsNet $ 1,510,743,988
Holdings Count | Holding 672
InvestmentCompanyPortfolioTurnover 22.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,510,743,988
Number of Portfolio Holdings
672
Portfolio Turnover Rate
22%
Average MaturityFootnote Reference§
8.14 years
DurationFootnote Reference
5.74 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
61.1%
Corporate Debt Securities
13.4
U.S. Government Agency Obligations
9.3
U.S. Government Obligations
9.2
Commercial Paper
7.2
Mortgage-Backed Securities
2.8
Asset-Backed Securities
2.1
Short-Term U.S. Government Obligations
1.6
Repurchase Agreements
1.1
Foreign Government Obligations
0.3
Other Investment Company
0.3
Net Other Assets (Liabilities)Footnote Reference^
(8.4)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
18.5%
AAA
4.6
AA
0.4
A
3.4
BBB
8.5
BB
1.6
NR (Not Rated)
0.1
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
5.2%
Apple, Inc.
3.9
Microsoft Corp.
3.3
Amazon.com, Inc.
2.9
Alphabet, Inc., Class A
2.3
Broadcom, Inc.
2.1
Uniform Mortgage-Backed Security, TBA, 2.50%, 05/01/2056
1.6
Alphabet, Inc., Class C
1.5
Meta Platforms, Inc., Class A
1.4
Uniform Mortgage-Backed Security, TBA, 3.00%, 05/01/2056
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000081953  
Shareholder Report [Line Items]  
Fund Name Transamerica Multi-Managed Balanced
Class Name Class I
Trading Symbol TBLIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$37
0.73%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.73% [51]
AssetsNet $ 1,510,743,988
Holdings Count | Holding 672
InvestmentCompanyPortfolioTurnover 22.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,510,743,988
Number of Portfolio Holdings
672
Portfolio Turnover Rate
22%
Average MaturityFootnote Reference§
8.14 years
DurationFootnote Reference
5.74 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
61.1%
Corporate Debt Securities
13.4
U.S. Government Agency Obligations
9.3
U.S. Government Obligations
9.2
Commercial Paper
7.2
Mortgage-Backed Securities
2.8
Asset-Backed Securities
2.1
Short-Term U.S. Government Obligations
1.6
Repurchase Agreements
1.1
Foreign Government Obligations
0.3
Other Investment Company
0.3
Net Other Assets (Liabilities)Footnote Reference^
(8.4)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
18.5%
AAA
4.6
AA
0.4
A
3.4
BBB
8.5
BB
1.6
NR (Not Rated)
0.1
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
5.2%
Apple, Inc.
3.9
Microsoft Corp.
3.3
Amazon.com, Inc.
2.9
Alphabet, Inc., Class A
2.3
Broadcom, Inc.
2.1
Uniform Mortgage-Backed Security, TBA, 2.50%, 05/01/2056
1.6
Alphabet, Inc., Class C
1.5
Meta Platforms, Inc., Class A
1.4
Uniform Mortgage-Backed Security, TBA, 3.00%, 05/01/2056
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000234683  
Shareholder Report [Line Items]  
Fund Name Transamerica Multi-Managed Balanced
Class Name Class R
Trading Symbol TAAHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R
$61
1.21%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 61
Expense Ratio, Percent 1.21% [52]
AssetsNet $ 1,510,743,988
Holdings Count | Holding 672
InvestmentCompanyPortfolioTurnover 22.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,510,743,988
Number of Portfolio Holdings
672
Portfolio Turnover Rate
22%
Average MaturityFootnote Reference§
8.14 years
DurationFootnote Reference
5.74 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
61.1%
Corporate Debt Securities
13.4
U.S. Government Agency Obligations
9.3
U.S. Government Obligations
9.2
Commercial Paper
7.2
Mortgage-Backed Securities
2.8
Asset-Backed Securities
2.1
Short-Term U.S. Government Obligations
1.6
Repurchase Agreements
1.1
Foreign Government Obligations
0.3
Other Investment Company
0.3
Net Other Assets (Liabilities)Footnote Reference^
(8.4)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
18.5%
AAA
4.6
AA
0.4
A
3.4
BBB
8.5
BB
1.6
NR (Not Rated)
0.1
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
5.2%
Apple, Inc.
3.9
Microsoft Corp.
3.3
Amazon.com, Inc.
2.9
Alphabet, Inc., Class A
2.3
Broadcom, Inc.
2.1
Uniform Mortgage-Backed Security, TBA, 2.50%, 05/01/2056
1.6
Alphabet, Inc., Class C
1.5
Meta Platforms, Inc., Class A
1.4
Uniform Mortgage-Backed Security, TBA, 3.00%, 05/01/2056
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000156741  
Shareholder Report [Line Items]  
Fund Name Transamerica Multi-Managed Balanced
Class Name Class R6
Trading Symbol TAMMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$32
0.64%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.64% [53]
AssetsNet $ 1,510,743,988
Holdings Count | Holding 672
InvestmentCompanyPortfolioTurnover 22.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,510,743,988
Number of Portfolio Holdings
672
Portfolio Turnover Rate
22%
Average MaturityFootnote Reference§
8.14 years
DurationFootnote Reference
5.74 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
61.1%
Corporate Debt Securities
13.4
U.S. Government Agency Obligations
9.3
U.S. Government Obligations
9.2
Commercial Paper
7.2
Mortgage-Backed Securities
2.8
Asset-Backed Securities
2.1
Short-Term U.S. Government Obligations
1.6
Repurchase Agreements
1.1
Foreign Government Obligations
0.3
Other Investment Company
0.3
Net Other Assets (Liabilities)Footnote Reference^
(8.4)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
18.5%
AAA
4.6
AA
0.4
A
3.4
BBB
8.5
BB
1.6
NR (Not Rated)
0.1
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
5.2%
Apple, Inc.
3.9
Microsoft Corp.
3.3
Amazon.com, Inc.
2.9
Alphabet, Inc., Class A
2.3
Broadcom, Inc.
2.1
Uniform Mortgage-Backed Security, TBA, 2.50%, 05/01/2056
1.6
Alphabet, Inc., Class C
1.5
Meta Platforms, Inc., Class A
1.4
Uniform Mortgage-Backed Security, TBA, 3.00%, 05/01/2056
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000054268  
Shareholder Report [Line Items]  
Fund Name Transamerica Short-Term Bond
Class Name Class A
Trading Symbol ITAAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$36
0.72%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.72% [54]
AssetsNet $ 3,601,166,453
Holdings Count | Holding 372
InvestmentCompanyPortfolioTurnover 29.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$3,601,166,453
Number of Portfolio Holdings
372
Portfolio Turnover Rate
29%
Average MaturityFootnote Reference§
1.91 years
DurationFootnote Reference
1.98 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
70.2%
Asset-Backed Securities
11.4
Mortgage-Backed Securities
10.4
U.S. Government Obligations
5.4
U.S. Government Agency Obligations
1.2
Repurchase Agreements
0.9
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
0.1
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
6.6%
AAA
16.2
AA
4.2
A
25.9
BBB
42.3
BB
3.1
B
0.1
Below CCC
0.2
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
U.S. Treasury Notes, 3.88%, 03/15/2028
3.3%
U.S. Treasury Notes, 3.63%, 08/31/2029
1.2
U.S. Treasury Notes, 4.25%, 02/28/2029
1.0
Wells Fargo & Co., 3-Month Term SOFR, 3.58%, 05/22/2028
0.9
GXO Logistics, Inc., 6.25%, 05/06/2029
0.8
Citigroup, Inc., 3-Month Term SOFR, 4.08%, 04/23/2029
0.7
Bank of America Corp., 1-Day SOFR, 4.38%, 04/27/2028
0.7
U.S. Bank NA, 1-Day SOFR, 4.73%, 05/15/2028
0.6
Avolon Holdings Funding Ltd., 6.38%, 05/04/2028
0.6
Santander U.K. Group Holdings PLC, 1-Day SOFR Index, 4.32%, 09/22/2029
0.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000054269  
Shareholder Report [Line Items]  
Fund Name Transamerica Short-Term Bond
Class Name Class C
Trading Symbol ITACX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$74
1.48%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 74
Expense Ratio, Percent 1.48% [55]
AssetsNet $ 3,601,166,453
Holdings Count | Holding 372
InvestmentCompanyPortfolioTurnover 29.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$3,601,166,453
Number of Portfolio Holdings
372
Portfolio Turnover Rate
29%
Average MaturityFootnote Reference§
1.91 years
DurationFootnote Reference
1.98 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
70.2%
Asset-Backed Securities
11.4
Mortgage-Backed Securities
10.4
U.S. Government Obligations
5.4
U.S. Government Agency Obligations
1.2
Repurchase Agreements
0.9
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
0.1
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
6.6%
AAA
16.2
AA
4.2
A
25.9
BBB
42.3
BB
3.1
B
0.1
Below CCC
0.2
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
U.S. Treasury Notes, 3.88%, 03/15/2028
3.3%
U.S. Treasury Notes, 3.63%, 08/31/2029
1.2
U.S. Treasury Notes, 4.25%, 02/28/2029
1.0
Wells Fargo & Co., 3-Month Term SOFR, 3.58%, 05/22/2028
0.9
GXO Logistics, Inc., 6.25%, 05/06/2029
0.8
Citigroup, Inc., 3-Month Term SOFR, 4.08%, 04/23/2029
0.7
Bank of America Corp., 1-Day SOFR, 4.38%, 04/27/2028
0.7
U.S. Bank NA, 1-Day SOFR, 4.73%, 05/15/2028
0.6
Avolon Holdings Funding Ltd., 6.38%, 05/04/2028
0.6
Santander U.K. Group Holdings PLC, 1-Day SOFR Index, 4.32%, 09/22/2029
0.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000081831  
Shareholder Report [Line Items]  
Fund Name Transamerica Short-Term Bond
Class Name Class I
Trading Symbol TSTIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$25
0.51%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.51% [56]
AssetsNet $ 3,601,166,453
Holdings Count | Holding 372
InvestmentCompanyPortfolioTurnover 29.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$3,601,166,453
Number of Portfolio Holdings
372
Portfolio Turnover Rate
29%
Average MaturityFootnote Reference§
1.91 years
DurationFootnote Reference
1.98 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
70.2%
Asset-Backed Securities
11.4
Mortgage-Backed Securities
10.4
U.S. Government Obligations
5.4
U.S. Government Agency Obligations
1.2
Repurchase Agreements
0.9
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
0.1
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
6.6%
AAA
16.2
AA
4.2
A
25.9
BBB
42.3
BB
3.1
B
0.1
Below CCC
0.2
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
U.S. Treasury Notes, 3.88%, 03/15/2028
3.3%
U.S. Treasury Notes, 3.63%, 08/31/2029
1.2
U.S. Treasury Notes, 4.25%, 02/28/2029
1.0
Wells Fargo & Co., 3-Month Term SOFR, 3.58%, 05/22/2028
0.9
GXO Logistics, Inc., 6.25%, 05/06/2029
0.8
Citigroup, Inc., 3-Month Term SOFR, 4.08%, 04/23/2029
0.7
Bank of America Corp., 1-Day SOFR, 4.38%, 04/27/2028
0.7
U.S. Bank NA, 1-Day SOFR, 4.73%, 05/15/2028
0.6
Avolon Holdings Funding Ltd., 6.38%, 05/04/2028
0.6
Santander U.K. Group Holdings PLC, 1-Day SOFR Index, 4.32%, 09/22/2029
0.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021256  
Shareholder Report [Line Items]  
Fund Name Transamerica Short-Term Bond
Class Name Class I2
Trading Symbol TSIWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$20
0.41%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.41% [57]
AssetsNet $ 3,601,166,453
Holdings Count | Holding 372
InvestmentCompanyPortfolioTurnover 29.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$3,601,166,453
Number of Portfolio Holdings
372
Portfolio Turnover Rate
29%
Average MaturityFootnote Reference§
1.91 years
DurationFootnote Reference
1.98 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
70.2%
Asset-Backed Securities
11.4
Mortgage-Backed Securities
10.4
U.S. Government Obligations
5.4
U.S. Government Agency Obligations
1.2
Repurchase Agreements
0.9
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
0.1
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
6.6%
AAA
16.2
AA
4.2
A
25.9
BBB
42.3
BB
3.1
B
0.1
Below CCC
0.2
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
U.S. Treasury Notes, 3.88%, 03/15/2028
3.3%
U.S. Treasury Notes, 3.63%, 08/31/2029
1.2
U.S. Treasury Notes, 4.25%, 02/28/2029
1.0
Wells Fargo & Co., 3-Month Term SOFR, 3.58%, 05/22/2028
0.9
GXO Logistics, Inc., 6.25%, 05/06/2029
0.8
Citigroup, Inc., 3-Month Term SOFR, 4.08%, 04/23/2029
0.7
Bank of America Corp., 1-Day SOFR, 4.38%, 04/27/2028
0.7
U.S. Bank NA, 1-Day SOFR, 4.73%, 05/15/2028
0.6
Avolon Holdings Funding Ltd., 6.38%, 05/04/2028
0.6
Santander U.K. Group Holdings PLC, 1-Day SOFR Index, 4.32%, 09/22/2029
0.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000237766  
Shareholder Report [Line Items]  
Fund Name Transamerica Short-Term Bond
Class Name Class I3
Trading Symbol TAAQX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I3
$20
0.41%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.41% [58]
AssetsNet $ 3,601,166,453
Holdings Count | Holding 372
InvestmentCompanyPortfolioTurnover 29.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$3,601,166,453
Number of Portfolio Holdings
372
Portfolio Turnover Rate
29%
Average MaturityFootnote Reference§
1.91 years
DurationFootnote Reference
1.98 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
70.2%
Asset-Backed Securities
11.4
Mortgage-Backed Securities
10.4
U.S. Government Obligations
5.4
U.S. Government Agency Obligations
1.2
Repurchase Agreements
0.9
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
0.1
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
6.6%
AAA
16.2
AA
4.2
A
25.9
BBB
42.3
BB
3.1
B
0.1
Below CCC
0.2
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
U.S. Treasury Notes, 3.88%, 03/15/2028
3.3%
U.S. Treasury Notes, 3.63%, 08/31/2029
1.2
U.S. Treasury Notes, 4.25%, 02/28/2029
1.0
Wells Fargo & Co., 3-Month Term SOFR, 3.58%, 05/22/2028
0.9
GXO Logistics, Inc., 6.25%, 05/06/2029
0.8
Citigroup, Inc., 3-Month Term SOFR, 4.08%, 04/23/2029
0.7
Bank of America Corp., 1-Day SOFR, 4.38%, 04/27/2028
0.7
U.S. Bank NA, 1-Day SOFR, 4.73%, 05/15/2028
0.6
Avolon Holdings Funding Ltd., 6.38%, 05/04/2028
0.6
Santander U.K. Group Holdings PLC, 1-Day SOFR Index, 4.32%, 09/22/2029
0.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000237767  
Shareholder Report [Line Items]  
Fund Name Transamerica Short-Term Bond
Class Name Class R
Trading Symbol TAASX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R
$45
0.90%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.90% [59]
AssetsNet $ 3,601,166,453
Holdings Count | Holding 372
InvestmentCompanyPortfolioTurnover 29.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$3,601,166,453
Number of Portfolio Holdings
372
Portfolio Turnover Rate
29%
Average MaturityFootnote Reference§
1.91 years
DurationFootnote Reference
1.98 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
70.2%
Asset-Backed Securities
11.4
Mortgage-Backed Securities
10.4
U.S. Government Obligations
5.4
U.S. Government Agency Obligations
1.2
Repurchase Agreements
0.9
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
0.1
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
6.6%
AAA
16.2
AA
4.2
A
25.9
BBB
42.3
BB
3.1
B
0.1
Below CCC
0.2
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
U.S. Treasury Notes, 3.88%, 03/15/2028
3.3%
U.S. Treasury Notes, 3.63%, 08/31/2029
1.2
U.S. Treasury Notes, 4.25%, 02/28/2029
1.0
Wells Fargo & Co., 3-Month Term SOFR, 3.58%, 05/22/2028
0.9
GXO Logistics, Inc., 6.25%, 05/06/2029
0.8
Citigroup, Inc., 3-Month Term SOFR, 4.08%, 04/23/2029
0.7
Bank of America Corp., 1-Day SOFR, 4.38%, 04/27/2028
0.7
U.S. Bank NA, 1-Day SOFR, 4.73%, 05/15/2028
0.6
Avolon Holdings Funding Ltd., 6.38%, 05/04/2028
0.6
Santander U.K. Group Holdings PLC, 1-Day SOFR Index, 4.32%, 09/22/2029
0.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000237768  
Shareholder Report [Line Items]  
Fund Name Transamerica Short-Term Bond
Class Name Class R4
Trading Symbol TAAUX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R4
$32
0.65%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.65% [60]
AssetsNet $ 3,601,166,453
Holdings Count | Holding 372
InvestmentCompanyPortfolioTurnover 29.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$3,601,166,453
Number of Portfolio Holdings
372
Portfolio Turnover Rate
29%
Average MaturityFootnote Reference§
1.91 years
DurationFootnote Reference
1.98 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
70.2%
Asset-Backed Securities
11.4
Mortgage-Backed Securities
10.4
U.S. Government Obligations
5.4
U.S. Government Agency Obligations
1.2
Repurchase Agreements
0.9
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
0.1
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
6.6%
AAA
16.2
AA
4.2
A
25.9
BBB
42.3
BB
3.1
B
0.1
Below CCC
0.2
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
U.S. Treasury Notes, 3.88%, 03/15/2028
3.3%
U.S. Treasury Notes, 3.63%, 08/31/2029
1.2
U.S. Treasury Notes, 4.25%, 02/28/2029
1.0
Wells Fargo & Co., 3-Month Term SOFR, 3.58%, 05/22/2028
0.9
GXO Logistics, Inc., 6.25%, 05/06/2029
0.8
Citigroup, Inc., 3-Month Term SOFR, 4.08%, 04/23/2029
0.7
Bank of America Corp., 1-Day SOFR, 4.38%, 04/27/2028
0.7
U.S. Bank NA, 1-Day SOFR, 4.73%, 05/15/2028
0.6
Avolon Holdings Funding Ltd., 6.38%, 05/04/2028
0.6
Santander U.K. Group Holdings PLC, 1-Day SOFR Index, 4.32%, 09/22/2029
0.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000156747  
Shareholder Report [Line Items]  
Fund Name Transamerica Short-Term Bond
Class Name Class R6
Trading Symbol TASTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$20
0.41%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.41% [61]
AssetsNet $ 3,601,166,453
Holdings Count | Holding 372
InvestmentCompanyPortfolioTurnover 29.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$3,601,166,453
Number of Portfolio Holdings
372
Portfolio Turnover Rate
29%
Average MaturityFootnote Reference§
1.91 years
DurationFootnote Reference
1.98 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
70.2%
Asset-Backed Securities
11.4
Mortgage-Backed Securities
10.4
U.S. Government Obligations
5.4
U.S. Government Agency Obligations
1.2
Repurchase Agreements
0.9
Other Investment Company
0.4
Net Other Assets (Liabilities)Footnote Reference^
0.1
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
6.6%
AAA
16.2
AA
4.2
A
25.9
BBB
42.3
BB
3.1
B
0.1
Below CCC
0.2
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
U.S. Treasury Notes, 3.88%, 03/15/2028
3.3%
U.S. Treasury Notes, 3.63%, 08/31/2029
1.2
U.S. Treasury Notes, 4.25%, 02/28/2029
1.0
Wells Fargo & Co., 3-Month Term SOFR, 3.58%, 05/22/2028
0.9
GXO Logistics, Inc., 6.25%, 05/06/2029
0.8
Citigroup, Inc., 3-Month Term SOFR, 4.08%, 04/23/2029
0.7
Bank of America Corp., 1-Day SOFR, 4.38%, 04/27/2028
0.7
U.S. Bank NA, 1-Day SOFR, 4.73%, 05/15/2028
0.6
Avolon Holdings Funding Ltd., 6.38%, 05/04/2028
0.6
Santander U.K. Group Holdings PLC, 1-Day SOFR Index, 4.32%, 09/22/2029
0.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000117711  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Growth
Class Name Class A
Trading Symbol ASGTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$70
1.40%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 70
Expense Ratio, Percent 1.40% [62]
AssetsNet $ 80,246,292
Holdings Count | Holding 55
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$80,246,292
Number of Portfolio Holdings
55
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
29.5%
 
Health Care
16.2
 
Information Technology
14.7
 
Consumer Discretionary
12.6
 
Energy
10.7
 
Financials
8.3
 
Real Estate
1.9
 
Consumer Staples
1.4
 
Utilities
1.2
Repurchase Agreements
2.0
Net Other Assets (Liabilities)Footnote Reference^
1.5
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Ligand Pharmaceuticals, Inc.
3.8%
Saia, Inc.
3.5
MACOM Technology Solutions Holdings, Inc.
3.4
UL Solutions, Inc., Class A
3.3
PDF Solutions, Inc.
3.0
Solaris Energy Infrastructure, Inc.
2.8
Oceaneering International, Inc.
2.4
SharkNinja, Inc.
2.4
Simpson Manufacturing Co., Inc.
2.4
Lazard, Inc.
2.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000117712  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Growth
Class Name Class C
Trading Symbol CSGTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$107
2.13%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 107
Expense Ratio, Percent 2.13% [63]
AssetsNet $ 80,246,292
Holdings Count | Holding 55
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$80,246,292
Number of Portfolio Holdings
55
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
29.5%
 
Health Care
16.2
 
Information Technology
14.7
 
Consumer Discretionary
12.6
 
Energy
10.7
 
Financials
8.3
 
Real Estate
1.9
 
Consumer Staples
1.4
 
Utilities
1.2
Repurchase Agreements
2.0
Net Other Assets (Liabilities)Footnote Reference^
1.5
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Ligand Pharmaceuticals, Inc.
3.8%
Saia, Inc.
3.5
MACOM Technology Solutions Holdings, Inc.
3.4
UL Solutions, Inc., Class A
3.3
PDF Solutions, Inc.
3.0
Solaris Energy Infrastructure, Inc.
2.8
Oceaneering International, Inc.
2.4
SharkNinja, Inc.
2.4
Simpson Manufacturing Co., Inc.
2.4
Lazard, Inc.
2.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000117713  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Growth
Class Name Class I
Trading Symbol ISCGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$55
1.10%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.10% [64]
AssetsNet $ 80,246,292
Holdings Count | Holding 55
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$80,246,292
Number of Portfolio Holdings
55
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
29.5%
 
Health Care
16.2
 
Information Technology
14.7
 
Consumer Discretionary
12.6
 
Energy
10.7
 
Financials
8.3
 
Real Estate
1.9
 
Consumer Staples
1.4
 
Utilities
1.2
Repurchase Agreements
2.0
Net Other Assets (Liabilities)Footnote Reference^
1.5
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Ligand Pharmaceuticals, Inc.
3.8%
Saia, Inc.
3.5
MACOM Technology Solutions Holdings, Inc.
3.4
UL Solutions, Inc., Class A
3.3
PDF Solutions, Inc.
3.0
Solaris Energy Infrastructure, Inc.
2.8
Oceaneering International, Inc.
2.4
SharkNinja, Inc.
2.4
Simpson Manufacturing Co., Inc.
2.4
Lazard, Inc.
2.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000117714  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Growth
Class Name Class I2
Trading Symbol TSPIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$50
1.00%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 50
Expense Ratio, Percent 1.00% [65]
AssetsNet $ 80,246,292
Holdings Count | Holding 55
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$80,246,292
Number of Portfolio Holdings
55
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
29.5%
 
Health Care
16.2
 
Information Technology
14.7
 
Consumer Discretionary
12.6
 
Energy
10.7
 
Financials
8.3
 
Real Estate
1.9
 
Consumer Staples
1.4
 
Utilities
1.2
Repurchase Agreements
2.0
Net Other Assets (Liabilities)Footnote Reference^
1.5
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Ligand Pharmaceuticals, Inc.
3.8%
Saia, Inc.
3.5
MACOM Technology Solutions Holdings, Inc.
3.4
UL Solutions, Inc., Class A
3.3
PDF Solutions, Inc.
3.0
Solaris Energy Infrastructure, Inc.
2.8
Oceaneering International, Inc.
2.4
SharkNinja, Inc.
2.4
Simpson Manufacturing Co., Inc.
2.4
Lazard, Inc.
2.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171822  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Growth
Class Name Class I3
Trading Symbol TSPTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I3
$50
1.00%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 50
Expense Ratio, Percent 1.00% [66]
AssetsNet $ 80,246,292
Holdings Count | Holding 55
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$80,246,292
Number of Portfolio Holdings
55
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
29.5%
 
Health Care
16.2
 
Information Technology
14.7
 
Consumer Discretionary
12.6
 
Energy
10.7
 
Financials
8.3
 
Real Estate
1.9
 
Consumer Staples
1.4
 
Utilities
1.2
Repurchase Agreements
2.0
Net Other Assets (Liabilities)Footnote Reference^
1.5
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Ligand Pharmaceuticals, Inc.
3.8%
Saia, Inc.
3.5
MACOM Technology Solutions Holdings, Inc.
3.4
UL Solutions, Inc., Class A
3.3
PDF Solutions, Inc.
3.0
Solaris Energy Infrastructure, Inc.
2.8
Oceaneering International, Inc.
2.4
SharkNinja, Inc.
2.4
Simpson Manufacturing Co., Inc.
2.4
Lazard, Inc.
2.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171820  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Growth
Class Name Class R
Trading Symbol TSPRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R
$75
1.50%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 75
Expense Ratio, Percent 1.50% [67]
AssetsNet $ 80,246,292
Holdings Count | Holding 55
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$80,246,292
Number of Portfolio Holdings
55
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
29.5%
 
Health Care
16.2
 
Information Technology
14.7
 
Consumer Discretionary
12.6
 
Energy
10.7
 
Financials
8.3
 
Real Estate
1.9
 
Consumer Staples
1.4
 
Utilities
1.2
Repurchase Agreements
2.0
Net Other Assets (Liabilities)Footnote Reference^
1.5
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Ligand Pharmaceuticals, Inc.
3.8%
Saia, Inc.
3.5
MACOM Technology Solutions Holdings, Inc.
3.4
UL Solutions, Inc., Class A
3.3
PDF Solutions, Inc.
3.0
Solaris Energy Infrastructure, Inc.
2.8
Oceaneering International, Inc.
2.4
SharkNinja, Inc.
2.4
Simpson Manufacturing Co., Inc.
2.4
Lazard, Inc.
2.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171821  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Growth
Class Name Class R4
Trading Symbol TSPFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R4
$58
1.15%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 58
Expense Ratio, Percent 1.15% [68]
AssetsNet $ 80,246,292
Holdings Count | Holding 55
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$80,246,292
Number of Portfolio Holdings
55
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
29.5%
 
Health Care
16.2
 
Information Technology
14.7
 
Consumer Discretionary
12.6
 
Energy
10.7
 
Financials
8.3
 
Real Estate
1.9
 
Consumer Staples
1.4
 
Utilities
1.2
Repurchase Agreements
2.0
Net Other Assets (Liabilities)Footnote Reference^
1.5
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Ligand Pharmaceuticals, Inc.
3.8%
Saia, Inc.
3.5
MACOM Technology Solutions Holdings, Inc.
3.4
UL Solutions, Inc., Class A
3.3
PDF Solutions, Inc.
3.0
Solaris Energy Infrastructure, Inc.
2.8
Oceaneering International, Inc.
2.4
SharkNinja, Inc.
2.4
Simpson Manufacturing Co., Inc.
2.4
Lazard, Inc.
2.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000172147  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Growth
Class Name Class R6
Trading Symbol RTSGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$50
1.00%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 50
Expense Ratio, Percent 1.00% [69]
AssetsNet $ 80,246,292
Holdings Count | Holding 55
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$80,246,292
Number of Portfolio Holdings
55
Portfolio Turnover Rate
27%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Industrials
29.5%
 
Health Care
16.2
 
Information Technology
14.7
 
Consumer Discretionary
12.6
 
Energy
10.7
 
Financials
8.3
 
Real Estate
1.9
 
Consumer Staples
1.4
 
Utilities
1.2
Repurchase Agreements
2.0
Net Other Assets (Liabilities)Footnote Reference^
1.5
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Ligand Pharmaceuticals, Inc.
3.8%
Saia, Inc.
3.5
MACOM Technology Solutions Holdings, Inc.
3.4
UL Solutions, Inc., Class A
3.3
PDF Solutions, Inc.
3.0
Solaris Energy Infrastructure, Inc.
2.8
Oceaneering International, Inc.
2.4
SharkNinja, Inc.
2.4
Simpson Manufacturing Co., Inc.
2.4
Lazard, Inc.
2.3
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000112974  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Value
Class Name Class A
Trading Symbol TSLAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$72
1.29%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 72
Expense Ratio, Percent 1.29% [70]
AssetsNet $ 103,678,563
Holdings Count | Holding 163
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$103,678,563
Number of Portfolio Holdings
163
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.8%
 
Industrials
17.0
 
Information Technology
15.9
 
Consumer Discretionary
9.2
 
Health Care
9.0
 
Energy
8.2
 
Real Estate
6.8
 
Materials
3.4
 
Communication Services
3.2
 
Utilities
2.4
 
Consumer Staples
2.2
Repurchase Agreements
2.1
Net Other Assets (Liabilities)Footnote Reference^
(0.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Silicon Motion Technology Corp., ADR
2.3%
Mueller Industries, Inc.
2.3
Tower Semiconductor Ltd.
2.1
EMCOR Group, Inc.
1.9
Magnolia Oil & Gas Corp., Class A
1.9
Jazz Pharmaceuticals PLC
1.7
Northwestern Energy Group, Inc.
1.7
Adeia, Inc.
1.7
Granite Construction, Inc.
1.5
MKS, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000112971  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Value
Class Name Class C
Trading Symbol TSLCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$114
2.05%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 114
Expense Ratio, Percent 2.05% [71]
AssetsNet $ 103,678,563
Holdings Count | Holding 163
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$103,678,563
Number of Portfolio Holdings
163
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.8%
 
Industrials
17.0
 
Information Technology
15.9
 
Consumer Discretionary
9.2
 
Health Care
9.0
 
Energy
8.2
 
Real Estate
6.8
 
Materials
3.4
 
Communication Services
3.2
 
Utilities
2.4
 
Consumer Staples
2.2
Repurchase Agreements
2.1
Net Other Assets (Liabilities)Footnote Reference^
(0.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Silicon Motion Technology Corp., ADR
2.3%
Mueller Industries, Inc.
2.3
Tower Semiconductor Ltd.
2.1
EMCOR Group, Inc.
1.9
Magnolia Oil & Gas Corp., Class A
1.9
Jazz Pharmaceuticals PLC
1.7
Northwestern Energy Group, Inc.
1.7
Adeia, Inc.
1.7
Granite Construction, Inc.
1.5
MKS, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000112972  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Value
Class Name Class I
Trading Symbol TSLIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$55
0.99%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 55
Expense Ratio, Percent 0.99% [72]
AssetsNet $ 103,678,563
Holdings Count | Holding 163
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$103,678,563
Number of Portfolio Holdings
163
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.8%
 
Industrials
17.0
 
Information Technology
15.9
 
Consumer Discretionary
9.2
 
Health Care
9.0
 
Energy
8.2
 
Real Estate
6.8
 
Materials
3.4
 
Communication Services
3.2
 
Utilities
2.4
 
Consumer Staples
2.2
Repurchase Agreements
2.1
Net Other Assets (Liabilities)Footnote Reference^
(0.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Silicon Motion Technology Corp., ADR
2.3%
Mueller Industries, Inc.
2.3
Tower Semiconductor Ltd.
2.1
EMCOR Group, Inc.
1.9
Magnolia Oil & Gas Corp., Class A
1.9
Jazz Pharmaceuticals PLC
1.7
Northwestern Energy Group, Inc.
1.7
Adeia, Inc.
1.7
Granite Construction, Inc.
1.5
MKS, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000112973  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Value
Class Name Class I2
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$50
0.89%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.89% [73]
AssetsNet $ 103,678,563
Holdings Count | Holding 163
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$103,678,563
Number of Portfolio Holdings
163
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.8%
 
Industrials
17.0
 
Information Technology
15.9
 
Consumer Discretionary
9.2
 
Health Care
9.0
 
Energy
8.2
 
Real Estate
6.8
 
Materials
3.4
 
Communication Services
3.2
 
Utilities
2.4
 
Consumer Staples
2.2
Repurchase Agreements
2.1
Net Other Assets (Liabilities)Footnote Reference^
(0.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Silicon Motion Technology Corp., ADR
2.3%
Mueller Industries, Inc.
2.3
Tower Semiconductor Ltd.
2.1
EMCOR Group, Inc.
1.9
Magnolia Oil & Gas Corp., Class A
1.9
Jazz Pharmaceuticals PLC
1.7
Northwestern Energy Group, Inc.
1.7
Adeia, Inc.
1.7
Granite Construction, Inc.
1.5
MKS, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171819  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Value
Class Name Class I3
Trading Symbol TSLTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I3
$50
0.89%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.89% [74]
AssetsNet $ 103,678,563
Holdings Count | Holding 163
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$103,678,563
Number of Portfolio Holdings
163
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.8%
 
Industrials
17.0
 
Information Technology
15.9
 
Consumer Discretionary
9.2
 
Health Care
9.0
 
Energy
8.2
 
Real Estate
6.8
 
Materials
3.4
 
Communication Services
3.2
 
Utilities
2.4
 
Consumer Staples
2.2
Repurchase Agreements
2.1
Net Other Assets (Liabilities)Footnote Reference^
(0.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Silicon Motion Technology Corp., ADR
2.3%
Mueller Industries, Inc.
2.3
Tower Semiconductor Ltd.
2.1
EMCOR Group, Inc.
1.9
Magnolia Oil & Gas Corp., Class A
1.9
Jazz Pharmaceuticals PLC
1.7
Northwestern Energy Group, Inc.
1.7
Adeia, Inc.
1.7
Granite Construction, Inc.
1.5
MKS, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171817  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Value
Class Name Class R
Trading Symbol TRSLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R
$77
1.39%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 77
Expense Ratio, Percent 1.39% [75]
AssetsNet $ 103,678,563
Holdings Count | Holding 163
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$103,678,563
Number of Portfolio Holdings
163
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.8%
 
Industrials
17.0
 
Information Technology
15.9
 
Consumer Discretionary
9.2
 
Health Care
9.0
 
Energy
8.2
 
Real Estate
6.8
 
Materials
3.4
 
Communication Services
3.2
 
Utilities
2.4
 
Consumer Staples
2.2
Repurchase Agreements
2.1
Net Other Assets (Liabilities)Footnote Reference^
(0.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Silicon Motion Technology Corp., ADR
2.3%
Mueller Industries, Inc.
2.3
Tower Semiconductor Ltd.
2.1
EMCOR Group, Inc.
1.9
Magnolia Oil & Gas Corp., Class A
1.9
Jazz Pharmaceuticals PLC
1.7
Northwestern Energy Group, Inc.
1.7
Adeia, Inc.
1.7
Granite Construction, Inc.
1.5
MKS, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171818  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Value
Class Name Class R4
Trading Symbol TSLFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R4
$61
1.10%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 61
Expense Ratio, Percent 1.10% [76]
AssetsNet $ 103,678,563
Holdings Count | Holding 163
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$103,678,563
Number of Portfolio Holdings
163
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.8%
 
Industrials
17.0
 
Information Technology
15.9
 
Consumer Discretionary
9.2
 
Health Care
9.0
 
Energy
8.2
 
Real Estate
6.8
 
Materials
3.4
 
Communication Services
3.2
 
Utilities
2.4
 
Consumer Staples
2.2
Repurchase Agreements
2.1
Net Other Assets (Liabilities)Footnote Reference^
(0.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Silicon Motion Technology Corp., ADR
2.3%
Mueller Industries, Inc.
2.3
Tower Semiconductor Ltd.
2.1
EMCOR Group, Inc.
1.9
Magnolia Oil & Gas Corp., Class A
1.9
Jazz Pharmaceuticals PLC
1.7
Northwestern Energy Group, Inc.
1.7
Adeia, Inc.
1.7
Granite Construction, Inc.
1.5
MKS, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000172145  
Shareholder Report [Line Items]  
Fund Name Transamerica Small Cap Value
Class Name Class R6
Trading Symbol TSLRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$50
0.89%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.89% [77]
AssetsNet $ 103,678,563
Holdings Count | Holding 163
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$103,678,563
Number of Portfolio Holdings
163
Portfolio Turnover Rate
7%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.8%
 
Industrials
17.0
 
Information Technology
15.9
 
Consumer Discretionary
9.2
 
Health Care
9.0
 
Energy
8.2
 
Real Estate
6.8
 
Materials
3.4
 
Communication Services
3.2
 
Utilities
2.4
 
Consumer Staples
2.2
Repurchase Agreements
2.1
Net Other Assets (Liabilities)Footnote Reference^
(0.2)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Silicon Motion Technology Corp., ADR
2.3%
Mueller Industries, Inc.
2.3
Tower Semiconductor Ltd.
2.1
EMCOR Group, Inc.
1.9
Magnolia Oil & Gas Corp., Class A
1.9
Jazz Pharmaceuticals PLC
1.7
Northwestern Energy Group, Inc.
1.7
Adeia, Inc.
1.7
Granite Construction, Inc.
1.5
MKS, Inc.
1.5
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021260  
Shareholder Report [Line Items]  
Fund Name Transamerica Small/Mid Cap Value
Class Name Class A
Trading Symbol IIVAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$63
1.18%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 63
Expense Ratio, Percent 1.18% [78]
AssetsNet $ 652,696,690
Holdings Count | Holding 225
InvestmentCompanyPortfolioTurnover 30.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$652,696,690
Number of Portfolio Holdings
225
Portfolio Turnover Rate
30%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
14.7%
 
Health Care
12.8
 
Industrials
11.8
 
Information Technology
11.3
 
Consumer Staples
9.0
 
Consumer Discretionary
7.7
 
Energy
7.2
 
Communication Services
7.2
 
Real Estate
6.3
 
Materials
5.2
 
Utilities
4.3
Repurchase Agreements
2.7
Other Investment Company
0.6
Net Other Assets (Liabilities)Footnote Reference^
(0.8)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
1.7%
LKQ Corp.
1.5
First Citizens BancShares, Inc., Class A
1.4
Crown Castle, Inc.
1.4
Charter Communications, Inc., Class A
1.4
Dominion Energy, Inc.
1.3
Graphic Packaging Holding Co.
1.3
Evergy, Inc.
1.3
U-Haul Holding Co.
1.3
SS&C Technologies Holdings, Inc.
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021262  
Shareholder Report [Line Items]  
Fund Name Transamerica Small/Mid Cap Value
Class Name Class C
Trading Symbol IIVLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$104
1.97%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 104
Expense Ratio, Percent 1.97% [79]
AssetsNet $ 652,696,690
Holdings Count | Holding 225
InvestmentCompanyPortfolioTurnover 30.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$652,696,690
Number of Portfolio Holdings
225
Portfolio Turnover Rate
30%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
14.7%
 
Health Care
12.8
 
Industrials
11.8
 
Information Technology
11.3
 
Consumer Staples
9.0
 
Consumer Discretionary
7.7
 
Energy
7.2
 
Communication Services
7.2
 
Real Estate
6.3
 
Materials
5.2
 
Utilities
4.3
Repurchase Agreements
2.7
Other Investment Company
0.6
Net Other Assets (Liabilities)Footnote Reference^
(0.8)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
1.7%
LKQ Corp.
1.5
First Citizens BancShares, Inc., Class A
1.4
Crown Castle, Inc.
1.4
Charter Communications, Inc., Class A
1.4
Dominion Energy, Inc.
1.3
Graphic Packaging Holding Co.
1.3
Evergy, Inc.
1.3
U-Haul Holding Co.
1.3
SS&C Technologies Holdings, Inc.
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000081833  
Shareholder Report [Line Items]  
Fund Name Transamerica Small/Mid Cap Value
Class Name Class I
Trading Symbol TSVIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$48
0.90%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.90% [80]
AssetsNet $ 652,696,690
Holdings Count | Holding 225
InvestmentCompanyPortfolioTurnover 30.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$652,696,690
Number of Portfolio Holdings
225
Portfolio Turnover Rate
30%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
14.7%
 
Health Care
12.8
 
Industrials
11.8
 
Information Technology
11.3
 
Consumer Staples
9.0
 
Consumer Discretionary
7.7
 
Energy
7.2
 
Communication Services
7.2
 
Real Estate
6.3
 
Materials
5.2
 
Utilities
4.3
Repurchase Agreements
2.7
Other Investment Company
0.6
Net Other Assets (Liabilities)Footnote Reference^
(0.8)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
1.7%
LKQ Corp.
1.5
First Citizens BancShares, Inc., Class A
1.4
Crown Castle, Inc.
1.4
Charter Communications, Inc., Class A
1.4
Dominion Energy, Inc.
1.3
Graphic Packaging Holding Co.
1.3
Evergy, Inc.
1.3
U-Haul Holding Co.
1.3
SS&C Technologies Holdings, Inc.
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021263  
Shareholder Report [Line Items]  
Fund Name Transamerica Small/Mid Cap Value
Class Name Class I2
Trading Symbol TSMVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$43
0.81%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.81% [81]
AssetsNet $ 652,696,690
Holdings Count | Holding 225
InvestmentCompanyPortfolioTurnover 30.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$652,696,690
Number of Portfolio Holdings
225
Portfolio Turnover Rate
30%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
14.7%
 
Health Care
12.8
 
Industrials
11.8
 
Information Technology
11.3
 
Consumer Staples
9.0
 
Consumer Discretionary
7.7
 
Energy
7.2
 
Communication Services
7.2
 
Real Estate
6.3
 
Materials
5.2
 
Utilities
4.3
Repurchase Agreements
2.7
Other Investment Company
0.6
Net Other Assets (Liabilities)Footnote Reference^
(0.8)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
1.7%
LKQ Corp.
1.5
First Citizens BancShares, Inc., Class A
1.4
Crown Castle, Inc.
1.4
Charter Communications, Inc., Class A
1.4
Dominion Energy, Inc.
1.3
Graphic Packaging Holding Co.
1.3
Evergy, Inc.
1.3
U-Haul Holding Co.
1.3
SS&C Technologies Holdings, Inc.
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000156749  
Shareholder Report [Line Items]  
Fund Name Transamerica Small/Mid Cap Value
Class Name Class R6
Trading Symbol TASMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$43
0.81%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.81% [82]
AssetsNet $ 652,696,690
Holdings Count | Holding 225
InvestmentCompanyPortfolioTurnover 30.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$652,696,690
Number of Portfolio Holdings
225
Portfolio Turnover Rate
30%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
14.7%
 
Health Care
12.8
 
Industrials
11.8
 
Information Technology
11.3
 
Consumer Staples
9.0
 
Consumer Discretionary
7.7
 
Energy
7.2
 
Communication Services
7.2
 
Real Estate
6.3
 
Materials
5.2
 
Utilities
4.3
Repurchase Agreements
2.7
Other Investment Company
0.6
Net Other Assets (Liabilities)Footnote Reference^
(0.8)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Kraft Heinz Co.
1.7%
LKQ Corp.
1.5
First Citizens BancShares, Inc., Class A
1.4
Crown Castle, Inc.
1.4
Charter Communications, Inc., Class A
1.4
Dominion Energy, Inc.
1.3
Graphic Packaging Holding Co.
1.3
Evergy, Inc.
1.3
U-Haul Holding Co.
1.3
SS&C Technologies Holdings, Inc.
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000149082  
Shareholder Report [Line Items]  
Fund Name Transamerica Strategic Income
Class Name Class A
Trading Symbol TUNAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$48
0.97%Footnote Reference*,Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.97% [83],[84]
AssetsNet $ 279,854,017
Holdings Count | Holding 1,018
InvestmentCompanyPortfolioTurnover 37.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$279,854,017
Number of Portfolio Holdings
1,018
Portfolio Turnover Rate
37%
Average MaturityFootnote Reference§
9.37 years
DurationFootnote Reference
4.68 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
53.3%
U.S. Government Agency Obligations
13.1
Loan Assignments
10.1
Asset-Backed Securities
7.6
Foreign Government Obligations
6.3
Short-Term Investment Companies
4.3
U.S. Government Obligations
2.8
Other Investment Company
2.3
Preferred Stocks
1.4
Common Stocks
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
(1.2)
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
15.9%
AAA
0.0Footnote Reference*
AA
1.4
A
6.9
BBB
25.9
BB
24.5
B
16.5
CCC
1.4
Below CCC
0.1
NR (Not Rated)
2.1
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
State Street Institutional U.S. Government Money Market Fund, 3.60%
4.3%
U.S. Treasury Bonds, 4.13%, 08/15/2044
1.4
Sculptor CLO XXX Ltd., Series 30A, Class D2R, 3-Month Term SOFR, 8.28%, 07/20/2038
1.3
Brazil Notas do Tesouro Nacional, 10.00%, 01/01/2031
1.0
Hungary Government Bonds, 7.00%, 10/24/2035
0.9
Bonos de la Tesoreria de la Republica en pesos, 4.70%, 09/01/2030
0.8
Colombia TES, 11.75%, 01/24/2035
0.8
Sound Point CLO 35 Ltd., Series 2022-35A, Class D2R, 3-Month Term SOFR, 7.52%, 04/26/2038
0.8
Dryden 95 CLO Ltd., Series 2021-95A, Class DR, 3-Month Term SOFR, 6.71%, 08/20/2034
0.8
LCM 41 Ltd., Series 41A, Class D1R, 3-Month Term SOFR, 7.27%, 04/15/2036
0.7
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000149084  
Shareholder Report [Line Items]  
Fund Name Transamerica Strategic Income
Class Name Class I
Trading Symbol TUNIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$32
0.63%Footnote Reference*,Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.63% [85],[86]
AssetsNet $ 279,854,017
Holdings Count | Holding 1,018
InvestmentCompanyPortfolioTurnover 37.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$279,854,017
Number of Portfolio Holdings
1,018
Portfolio Turnover Rate
37%
Average MaturityFootnote Reference§
9.37 years
DurationFootnote Reference
4.68 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
53.3%
U.S. Government Agency Obligations
13.1
Loan Assignments
10.1
Asset-Backed Securities
7.6
Foreign Government Obligations
6.3
Short-Term Investment Companies
4.3
U.S. Government Obligations
2.8
Other Investment Company
2.3
Preferred Stocks
1.4
Common Stocks
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
(1.2)
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
15.9%
AAA
0.0Footnote Reference*
AA
1.4
A
6.9
BBB
25.9
BB
24.5
B
16.5
CCC
1.4
Below CCC
0.1
NR (Not Rated)
2.1
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
State Street Institutional U.S. Government Money Market Fund, 3.60%
4.3%
U.S. Treasury Bonds, 4.13%, 08/15/2044
1.4
Sculptor CLO XXX Ltd., Series 30A, Class D2R, 3-Month Term SOFR, 8.28%, 07/20/2038
1.3
Brazil Notas do Tesouro Nacional, 10.00%, 01/01/2031
1.0
Hungary Government Bonds, 7.00%, 10/24/2035
0.9
Bonos de la Tesoreria de la Republica en pesos, 4.70%, 09/01/2030
0.8
Colombia TES, 11.75%, 01/24/2035
0.8
Sound Point CLO 35 Ltd., Series 2022-35A, Class D2R, 3-Month Term SOFR, 7.52%, 04/26/2038
0.8
Dryden 95 CLO Ltd., Series 2021-95A, Class DR, 3-Month Term SOFR, 6.71%, 08/20/2034
0.8
LCM 41 Ltd., Series 41A, Class D1R, 3-Month Term SOFR, 7.27%, 04/15/2036
0.7
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000149085  
Shareholder Report [Line Items]  
Fund Name Transamerica Strategic Income
Class Name Class I2
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$32
0.63%Footnote Reference*,Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.63% [87],[88]
AssetsNet $ 279,854,017
Holdings Count | Holding 1,018
InvestmentCompanyPortfolioTurnover 37.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$279,854,017
Number of Portfolio Holdings
1,018
Portfolio Turnover Rate
37%
Average MaturityFootnote Reference§
9.37 years
DurationFootnote Reference
4.68 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
53.3%
U.S. Government Agency Obligations
13.1
Loan Assignments
10.1
Asset-Backed Securities
7.6
Foreign Government Obligations
6.3
Short-Term Investment Companies
4.3
U.S. Government Obligations
2.8
Other Investment Company
2.3
Preferred Stocks
1.4
Common Stocks
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
(1.2)
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
15.9%
AAA
0.0Footnote Reference*
AA
1.4
A
6.9
BBB
25.9
BB
24.5
B
16.5
CCC
1.4
Below CCC
0.1
NR (Not Rated)
2.1
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
State Street Institutional U.S. Government Money Market Fund, 3.60%
4.3%
U.S. Treasury Bonds, 4.13%, 08/15/2044
1.4
Sculptor CLO XXX Ltd., Series 30A, Class D2R, 3-Month Term SOFR, 8.28%, 07/20/2038
1.3
Brazil Notas do Tesouro Nacional, 10.00%, 01/01/2031
1.0
Hungary Government Bonds, 7.00%, 10/24/2035
0.9
Bonos de la Tesoreria de la Republica en pesos, 4.70%, 09/01/2030
0.8
Colombia TES, 11.75%, 01/24/2035
0.8
Sound Point CLO 35 Ltd., Series 2022-35A, Class D2R, 3-Month Term SOFR, 7.52%, 04/26/2038
0.8
Dryden 95 CLO Ltd., Series 2021-95A, Class DR, 3-Month Term SOFR, 6.71%, 08/20/2034
0.8
LCM 41 Ltd., Series 41A, Class D1R, 3-Month Term SOFR, 7.27%, 04/15/2036
0.7
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000263010  
Shareholder Report [Line Items]  
Fund Name Transamerica Strategic Income
Class Name Class R6
Trading Symbol TUNRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$31
0.63%Footnote Reference*,Footnote Reference
Footnote Description
Footnote*
Annualized
Footnote
Does not include expenses of the underlying investments in which the Fund invests.
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.63% [89],[90]
AssetsNet $ 279,854,017
Holdings Count | Holding 1,018
InvestmentCompanyPortfolioTurnover 37.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$279,854,017
Number of Portfolio Holdings
1,018
Portfolio Turnover Rate
37%
Average MaturityFootnote Reference§
9.37 years
DurationFootnote Reference
4.68 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
53.3%
U.S. Government Agency Obligations
13.1
Loan Assignments
10.1
Asset-Backed Securities
7.6
Foreign Government Obligations
6.3
Short-Term Investment Companies
4.3
U.S. Government Obligations
2.8
Other Investment Company
2.3
Preferred Stocks
1.4
Common Stocks
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
(1.2)
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
U.S. Government and Agency Securities
15.9%
AAA
0.0Footnote Reference*
AA
1.4
A
6.9
BBB
25.9
BB
24.5
B
16.5
CCC
1.4
Below CCC
0.1
NR (Not Rated)
2.1
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
State Street Institutional U.S. Government Money Market Fund, 3.60%
4.3%
U.S. Treasury Bonds, 4.13%, 08/15/2044
1.4
Sculptor CLO XXX Ltd., Series 30A, Class D2R, 3-Month Term SOFR, 8.28%, 07/20/2038
1.3
Brazil Notas do Tesouro Nacional, 10.00%, 01/01/2031
1.0
Hungary Government Bonds, 7.00%, 10/24/2035
0.9
Bonos de la Tesoreria de la Republica en pesos, 4.70%, 09/01/2030
0.8
Colombia TES, 11.75%, 01/24/2035
0.8
Sound Point CLO 35 Ltd., Series 2022-35A, Class D2R, 3-Month Term SOFR, 7.52%, 04/26/2038
0.8
Dryden 95 CLO Ltd., Series 2021-95A, Class DR, 3-Month Term SOFR, 6.71%, 08/20/2034
0.8
LCM 41 Ltd., Series 41A, Class D1R, 3-Month Term SOFR, 7.27%, 04/15/2036
0.7
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000122141  
Shareholder Report [Line Items]  
Fund Name Transamerica Sustainable Equity Income
Class Name Class A
Trading Symbol TDFAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$55
1.05%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.05% [91]
AssetsNet $ 207,668,729
Holdings Count | Holding 44
InvestmentCompanyPortfolioTurnover 13.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$207,668,729
Number of Portfolio Holdings
44
Portfolio Turnover Rate
13%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.9%
 
Information Technology
18.9
 
Industrials
16.1
 
Health Care
13.6
 
Materials
7.9
 
Consumer Staples
6.1
 
Consumer Discretionary
5.5
 
Communication Services
4.9
 
Real Estate
4.2
 
Utilities
1.1
Repurchase Agreements
0.9
Other Investment Company
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.3)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
4.9%
Morgan Stanley
4.1
Cisco Systems, Inc.
3.9
Gilead Sciences, Inc.
3.7
Steel Dynamics, Inc.
3.6
CME Group, Inc.
3.5
Bank of America Corp.
3.5
Taiwan Semiconductor Manufacturing Co. Ltd., ADR
3.4
WESCO International, Inc.
3.1
Citizens Financial Group, Inc.
3.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000122142  
Shareholder Report [Line Items]  
Fund Name Transamerica Sustainable Equity Income
Class Name Class C
Trading Symbol TDFCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$100
1.90%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 100
Expense Ratio, Percent 1.90% [92]
AssetsNet $ 207,668,729
Holdings Count | Holding 44
InvestmentCompanyPortfolioTurnover 13.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$207,668,729
Number of Portfolio Holdings
44
Portfolio Turnover Rate
13%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.9%
 
Information Technology
18.9
 
Industrials
16.1
 
Health Care
13.6
 
Materials
7.9
 
Consumer Staples
6.1
 
Consumer Discretionary
5.5
 
Communication Services
4.9
 
Real Estate
4.2
 
Utilities
1.1
Repurchase Agreements
0.9
Other Investment Company
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.3)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
4.9%
Morgan Stanley
4.1
Cisco Systems, Inc.
3.9
Gilead Sciences, Inc.
3.7
Steel Dynamics, Inc.
3.6
CME Group, Inc.
3.5
Bank of America Corp.
3.5
Taiwan Semiconductor Manufacturing Co. Ltd., ADR
3.4
WESCO International, Inc.
3.1
Citizens Financial Group, Inc.
3.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000122143  
Shareholder Report [Line Items]  
Fund Name Transamerica Sustainable Equity Income
Class Name Class I
Trading Symbol TDFIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$41
0.77%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.77% [93]
AssetsNet $ 207,668,729
Holdings Count | Holding 44
InvestmentCompanyPortfolioTurnover 13.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$207,668,729
Number of Portfolio Holdings
44
Portfolio Turnover Rate
13%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.9%
 
Information Technology
18.9
 
Industrials
16.1
 
Health Care
13.6
 
Materials
7.9
 
Consumer Staples
6.1
 
Consumer Discretionary
5.5
 
Communication Services
4.9
 
Real Estate
4.2
 
Utilities
1.1
Repurchase Agreements
0.9
Other Investment Company
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.3)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
4.9%
Morgan Stanley
4.1
Cisco Systems, Inc.
3.9
Gilead Sciences, Inc.
3.7
Steel Dynamics, Inc.
3.6
CME Group, Inc.
3.5
Bank of America Corp.
3.5
Taiwan Semiconductor Manufacturing Co. Ltd., ADR
3.4
WESCO International, Inc.
3.1
Citizens Financial Group, Inc.
3.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000122144  
Shareholder Report [Line Items]  
Fund Name Transamerica Sustainable Equity Income
Class Name Class I2
Trading Symbol TRDIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$40
0.76%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 40
Expense Ratio, Percent 0.76% [94]
AssetsNet $ 207,668,729
Holdings Count | Holding 44
InvestmentCompanyPortfolioTurnover 13.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$207,668,729
Number of Portfolio Holdings
44
Portfolio Turnover Rate
13%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.9%
 
Information Technology
18.9
 
Industrials
16.1
 
Health Care
13.6
 
Materials
7.9
 
Consumer Staples
6.1
 
Consumer Discretionary
5.5
 
Communication Services
4.9
 
Real Estate
4.2
 
Utilities
1.1
Repurchase Agreements
0.9
Other Investment Company
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.3)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
4.9%
Morgan Stanley
4.1
Cisco Systems, Inc.
3.9
Gilead Sciences, Inc.
3.7
Steel Dynamics, Inc.
3.6
CME Group, Inc.
3.5
Bank of America Corp.
3.5
Taiwan Semiconductor Manufacturing Co. Ltd., ADR
3.4
WESCO International, Inc.
3.1
Citizens Financial Group, Inc.
3.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000156763  
Shareholder Report [Line Items]  
Fund Name Transamerica Sustainable Equity Income
Class Name Class R6
Trading Symbol TADFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$40
0.76%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 40
Expense Ratio, Percent 0.76% [95]
AssetsNet $ 207,668,729
Holdings Count | Holding 44
InvestmentCompanyPortfolioTurnover 13.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$207,668,729
Number of Portfolio Holdings
44
Portfolio Turnover Rate
13%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Financials
20.9%
 
Information Technology
18.9
 
Industrials
16.1
 
Health Care
13.6
 
Materials
7.9
 
Consumer Staples
6.1
 
Consumer Discretionary
5.5
 
Communication Services
4.9
 
Real Estate
4.2
 
Utilities
1.1
Repurchase Agreements
0.9
Other Investment Company
0.2
Net Other Assets (Liabilities)Footnote Reference^
(0.3)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Alphabet, Inc., Class A
4.9%
Morgan Stanley
4.1
Cisco Systems, Inc.
3.9
Gilead Sciences, Inc.
3.7
Steel Dynamics, Inc.
3.6
CME Group, Inc.
3.5
Bank of America Corp.
3.5
Taiwan Semiconductor Manufacturing Co. Ltd., ADR
3.4
WESCO International, Inc.
3.1
Citizens Financial Group, Inc.
3.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000241771  
Shareholder Report [Line Items]  
Fund Name Transamerica UltraShort Bond
Class Name Class A
Trading Symbol TUSBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$34
0.67%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.67% [96]
AssetsNet $ 31,314,820
Holdings Count | Holding 110
InvestmentCompanyPortfolioTurnover 208.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$31,314,820
Number of Portfolio Holdings
110
Portfolio Turnover Rate
208%
Average MaturityFootnote Reference§
0.56 years
DurationFootnote Reference
0.54 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
38.2%
Commercial Paper
32.4
Asset-Backed Securities
28.7
Repurchase Agreements
0.7
Net Other Assets (Liabilities)Footnote Reference^
0.0Footnote Reference*
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
AAA
25.4%
AA
0.9
A
13.0
BBB
26.3
NR (Not Rated)
1.3
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Bank of America Corp., 5.93%, 09/15/2027
2.0%
First National Master Note Trust, Series 2023-2, Class A, 5.77%, 09/15/2029
1.9
American Credit Acceptance Receivables Trust, Series 2026-2, Class A, 4.32%, 05/08/2030
1.9
Toyota Industries Commercial Finance Inc, 3.99%, 07/13/2026
1.9
Bayer Corp, 4.02%, 07/20/2026
1.9
Liberty Street Funding LLC, 3.98%, 10/20/2026
1.9
National Bank of Canada, 3.79%, 11/13/2026
1.9
Avis Budget Rental Car Funding AESOP LLC, Series 2023-5A, Class A, 5.78%, 04/20/2028
1.7
Avis Budget Rental Car Funding AESOP LLC, Series 2023-3A, Class A, 5.44%, 02/22/2028
1.7
Hertz Vehicle Financing III LP, Series 2021-2A, Class A, 1.68%, 12/27/2027
1.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000241768  
Shareholder Report [Line Items]  
Fund Name Transamerica UltraShort Bond
Class Name Class I
Trading Symbol TUSFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$18
0.35%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.35% [97]
AssetsNet $ 31,314,820
Holdings Count | Holding 110
InvestmentCompanyPortfolioTurnover 208.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$31,314,820
Number of Portfolio Holdings
110
Portfolio Turnover Rate
208%
Average MaturityFootnote Reference§
0.56 years
DurationFootnote Reference
0.54 years
Footnote Description
Footnote§
Average Maturity is computed by weighting the maturity of each security in the portfolio by the market value of the security, then averaging these weighted figures.
Footnote
Duration is a time measure of a bond’s interest rate sensitivity, based on the weighted average of the time periods over which a bond’s cash flows accrue to the bondholder.
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Corporate Debt Securities
38.2%
Commercial Paper
32.4
Asset-Backed Securities
28.7
Repurchase Agreements
0.7
Net Other Assets (Liabilities)Footnote Reference^
0.0Footnote Reference*
Footnote Description
Footnote*
Percentage rounds to less than 0.1% or (0.1)%.
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Table Summary
AAA
25.4%
AA
0.9
A
13.0
BBB
26.3
NR (Not Rated)
1.3
Credit Quality Explanation [Text Block] Credit quality represents a percentage of net assets at the end of the reporting period. Ratings BBB or higher are considered investment grade. Not rated securities do not necessarily indicate low credit quality, and may or may not be equivalent of investment grade. The table reflects Standard & Poor’s (“S&P”) ratings; percentages may include investments not rated by S&P but rated by Moody’s, or if unrated by Moody’s, by Fitch ratings, and then included in the closest equivalent S&P rating. Credit ratings are subject to change. The Fund itself has not been rated by an independent agency.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
Bank of America Corp., 5.93%, 09/15/2027
2.0%
First National Master Note Trust, Series 2023-2, Class A, 5.77%, 09/15/2029
1.9
American Credit Acceptance Receivables Trust, Series 2026-2, Class A, 4.32%, 05/08/2030
1.9
Toyota Industries Commercial Finance Inc, 3.99%, 07/13/2026
1.9
Bayer Corp, 4.02%, 07/20/2026
1.9
Liberty Street Funding LLC, 3.98%, 10/20/2026
1.9
National Bank of Canada, 3.79%, 11/13/2026
1.9
Avis Budget Rental Car Funding AESOP LLC, Series 2023-5A, Class A, 5.78%, 04/20/2028
1.7
Avis Budget Rental Car Funding AESOP LLC, Series 2023-3A, Class A, 5.44%, 02/22/2028
1.7
Hertz Vehicle Financing III LP, Series 2021-2A, Class A, 1.68%, 12/27/2027
1.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000080716  
Shareholder Report [Line Items]  
Fund Name Transamerica US Growth
Class Name Class A
Trading Symbol TADAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$49
0.99%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.99% [98]
AssetsNet $ 2,870,726,680
Holdings Count | Holding 62
InvestmentCompanyPortfolioTurnover 16.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$2,870,726,680
Number of Portfolio Holdings
62
Portfolio Turnover Rate
16%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
49.7%
 
Communication Services
16.3
 
Consumer Discretionary
13.3
 
Health Care
6.1
 
Industrials
5.9
 
Financials
5.5
 
Consumer Staples
1.8
 
Materials
1.1
 
Energy
0.2
Repurchase Agreements
0.6
Net Other Assets (Liabilities)Footnote Reference^
(0.5)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
11.8%
Alphabet, Inc., Class A
8.8
Apple, Inc.
8.5
Broadcom, Inc.
6.8
Amazon.com, Inc.
6.2
Microsoft Corp.
5.9
Meta Platforms, Inc., Class A
3.8
Eli Lilly & Co.
3.2
Mastercard, Inc., Class A
2.4
Netflix, Inc.
2.4
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000080718  
Shareholder Report [Line Items]  
Fund Name Transamerica US Growth
Class Name Class C
Trading Symbol TADCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$88
1.79%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 88
Expense Ratio, Percent 1.79% [99]
AssetsNet $ 2,870,726,680
Holdings Count | Holding 62
InvestmentCompanyPortfolioTurnover 16.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$2,870,726,680
Number of Portfolio Holdings
62
Portfolio Turnover Rate
16%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
49.7%
 
Communication Services
16.3
 
Consumer Discretionary
13.3
 
Health Care
6.1
 
Industrials
5.9
 
Financials
5.5
 
Consumer Staples
1.8
 
Materials
1.1
 
Energy
0.2
Repurchase Agreements
0.6
Net Other Assets (Liabilities)Footnote Reference^
(0.5)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
11.8%
Alphabet, Inc., Class A
8.8
Apple, Inc.
8.5
Broadcom, Inc.
6.8
Amazon.com, Inc.
6.2
Microsoft Corp.
5.9
Meta Platforms, Inc., Class A
3.8
Eli Lilly & Co.
3.2
Mastercard, Inc., Class A
2.4
Netflix, Inc.
2.4
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000081840  
Shareholder Report [Line Items]  
Fund Name Transamerica US Growth
Class Name Class I
Trading Symbol TDEIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$38
0.76%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.76% [100]
AssetsNet $ 2,870,726,680
Holdings Count | Holding 62
InvestmentCompanyPortfolioTurnover 16.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$2,870,726,680
Number of Portfolio Holdings
62
Portfolio Turnover Rate
16%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
49.7%
 
Communication Services
16.3
 
Consumer Discretionary
13.3
 
Health Care
6.1
 
Industrials
5.9
 
Financials
5.5
 
Consumer Staples
1.8
 
Materials
1.1
 
Energy
0.2
Repurchase Agreements
0.6
Net Other Assets (Liabilities)Footnote Reference^
(0.5)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
11.8%
Alphabet, Inc., Class A
8.8
Apple, Inc.
8.5
Broadcom, Inc.
6.8
Amazon.com, Inc.
6.2
Microsoft Corp.
5.9
Meta Platforms, Inc., Class A
3.8
Eli Lilly & Co.
3.2
Mastercard, Inc., Class A
2.4
Netflix, Inc.
2.4
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000080720  
Shareholder Report [Line Items]  
Fund Name Transamerica US Growth
Class Name Class I2
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I2
$33
0.67%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.67% [101]
AssetsNet $ 2,870,726,680
Holdings Count | Holding 62
InvestmentCompanyPortfolioTurnover 16.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$2,870,726,680
Number of Portfolio Holdings
62
Portfolio Turnover Rate
16%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
49.7%
 
Communication Services
16.3
 
Consumer Discretionary
13.3
 
Health Care
6.1
 
Industrials
5.9
 
Financials
5.5
 
Consumer Staples
1.8
 
Materials
1.1
 
Energy
0.2
Repurchase Agreements
0.6
Net Other Assets (Liabilities)Footnote Reference^
(0.5)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
11.8%
Alphabet, Inc., Class A
8.8
Apple, Inc.
8.5
Broadcom, Inc.
6.8
Amazon.com, Inc.
6.2
Microsoft Corp.
5.9
Meta Platforms, Inc., Class A
3.8
Eli Lilly & Co.
3.2
Mastercard, Inc., Class A
2.4
Netflix, Inc.
2.4
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000228027  
Shareholder Report [Line Items]  
Fund Name Transamerica US Growth
Class Name Class R6
Trading Symbol TAGHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$33
0.67%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.67% [102]
AssetsNet $ 2,870,726,680
Holdings Count | Holding 62
InvestmentCompanyPortfolioTurnover 16.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$2,870,726,680
Number of Portfolio Holdings
62
Portfolio Turnover Rate
16%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
49.7%
 
Communication Services
16.3
 
Consumer Discretionary
13.3
 
Health Care
6.1
 
Industrials
5.9
 
Financials
5.5
 
Consumer Staples
1.8
 
Materials
1.1
 
Energy
0.2
Repurchase Agreements
0.6
Net Other Assets (Liabilities)Footnote Reference^
(0.5)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
11.8%
Alphabet, Inc., Class A
8.8
Apple, Inc.
8.5
Broadcom, Inc.
6.8
Amazon.com, Inc.
6.2
Microsoft Corp.
5.9
Meta Platforms, Inc., Class A
3.8
Eli Lilly & Co.
3.2
Mastercard, Inc., Class A
2.4
Netflix, Inc.
2.4
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000110015  
Shareholder Report [Line Items]  
Fund Name Transamerica US Growth
Class Name Class T
Trading Symbol TWMTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at transamerica.com/investments/mutual-fund-prospectus. You can also request this information by contacting us at 888-233-4339.
Additional Information Phone Number <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">888-233-4339</span>
Additional Information Website transamerica.com/investments/mutual-fund-prospectus
Expenses [Text Block]

What were the Fund costs for the period?

Fund Overview Operating Expenses

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class T
$34
0.69%Footnote Reference*
Footnote Description
Footnote*
Annualized
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.69% [103]
AssetsNet $ 2,870,726,680
Holdings Count | Holding 62
InvestmentCompanyPortfolioTurnover 16.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$2,870,726,680
Number of Portfolio Holdings
62
Portfolio Turnover Rate
16%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
Common Stocks
 
Information Technology
49.7%
 
Communication Services
16.3
 
Consumer Discretionary
13.3
 
Health Care
6.1
 
Industrials
5.9
 
Financials
5.5
 
Consumer Staples
1.8
 
Materials
1.1
 
Energy
0.2
Repurchase Agreements
0.6
Net Other Assets (Liabilities)Footnote Reference^
(0.5)
Footnote Description
Footnote^
The Net Other Assets (Liabilities) category may include, but is not limited to, reverse repurchase agreements, forward foreign currency contracts, futures contracts, swap agreements, written options and swaptions, and cash collateral.
Largest Holdings [Text Block]

Top Holdings (Percentage of Net Assets)

Table Summary
NVIDIA Corp.
11.8%
Alphabet, Inc., Class A
8.8
Apple, Inc.
8.5
Broadcom, Inc.
6.8
Amazon.com, Inc.
6.2
Microsoft Corp.
5.9
Meta Platforms, Inc., Class A
3.8
Eli Lilly & Co.
3.2
Mastercard, Inc., Class A
2.4
Netflix, Inc.
2.4
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
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