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
C000021257  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Conservative Portfolio
Class Name Class A
Trading Symbol ICLAX
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
$25
0.49%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 $ 25
Expense Ratio, Percent 0.49% [1],[2]
AssetsNet $ 678,036,394
Holdings Count | Holding 37
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$678,036,394
Number of Portfolio Holdings
37
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
58.8%
U.S. Equity Funds
26.3
International Equity Funds
10.1
International Fixed Income Funds
2.5
Repurchase Agreements
1.3
U.S. Mixed Allocation Funds
0.9
International Alternative Funds
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
0.1
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
Transamerica Core Bond, Class I2
37.7%
Transamerica Bond, Class I2
12.2
Transamerica US Growth, Class I2
11.4
Transamerica Large Cap Value, Class I2
9.9
Transamerica International Equity, Class I2
4.0
Transamerica International Stock, Class I2
3.7
Transamerica Inflation Opportunities, Class I2
3.5
Transamerica Long Credit, Class I2
2.0
Transamerica Emerging Markets Debt, Class I2
1.9
Transamerica Bond, Class R6
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021259  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Conservative Portfolio
Class Name Class C
Trading Symbol ICLLX
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
$63
1.25%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 $ 63
Expense Ratio, Percent 1.25% [3],[4]
AssetsNet $ 678,036,394
Holdings Count | Holding 37
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$678,036,394
Number of Portfolio Holdings
37
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
58.8%
U.S. Equity Funds
26.3
International Equity Funds
10.1
International Fixed Income Funds
2.5
Repurchase Agreements
1.3
U.S. Mixed Allocation Funds
0.9
International Alternative Funds
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
0.1
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
Transamerica Core Bond, Class I2
37.7%
Transamerica Bond, Class I2
12.2
Transamerica US Growth, Class I2
11.4
Transamerica Large Cap Value, Class I2
9.9
Transamerica International Equity, Class I2
4.0
Transamerica International Stock, Class I2
3.7
Transamerica Inflation Opportunities, Class I2
3.5
Transamerica Long Credit, Class I2
2.0
Transamerica Emerging Markets Debt, Class I2
1.9
Transamerica Bond, Class R6
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000081832  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Conservative Portfolio
Class Name Class I
Trading Symbol TACIX
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
$8
0.15%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 $ 8
Expense Ratio, Percent 0.15% [5],[6]
AssetsNet $ 678,036,394
Holdings Count | Holding 37
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$678,036,394
Number of Portfolio Holdings
37
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
58.8%
U.S. Equity Funds
26.3
International Equity Funds
10.1
International Fixed Income Funds
2.5
Repurchase Agreements
1.3
U.S. Mixed Allocation Funds
0.9
International Alternative Funds
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
0.1
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
Transamerica Core Bond, Class I2
37.7%
Transamerica Bond, Class I2
12.2
Transamerica US Growth, Class I2
11.4
Transamerica Large Cap Value, Class I2
9.9
Transamerica International Equity, Class I2
4.0
Transamerica International Stock, Class I2
3.7
Transamerica Inflation Opportunities, Class I2
3.5
Transamerica Long Credit, Class I2
2.0
Transamerica Emerging Markets Debt, Class I2
1.9
Transamerica Bond, Class R6
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000035460  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Conservative Portfolio
Class Name Class R
Trading Symbol ICVRX
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
$36
0.71%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 $ 36
Expense Ratio, Percent 0.71% [7],[8]
AssetsNet $ 678,036,394
Holdings Count | Holding 37
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$678,036,394
Number of Portfolio Holdings
37
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
58.8%
U.S. Equity Funds
26.3
International Equity Funds
10.1
International Fixed Income Funds
2.5
Repurchase Agreements
1.3
U.S. Mixed Allocation Funds
0.9
International Alternative Funds
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
0.1
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
Transamerica Core Bond, Class I2
37.7%
Transamerica Bond, Class I2
12.2
Transamerica US Growth, Class I2
11.4
Transamerica Large Cap Value, Class I2
9.9
Transamerica International Equity, Class I2
4.0
Transamerica International Stock, Class I2
3.7
Transamerica Inflation Opportunities, Class I2
3.5
Transamerica Long Credit, Class I2
2.0
Transamerica Emerging Markets Debt, Class I2
1.9
Transamerica Bond, Class R6
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000236143  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Conservative Portfolio
Class Name Class R3
Trading Symbol TAAJX
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 R3
$18
0.35%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 $ 18
Expense Ratio, Percent 0.35% [9],[10]
AssetsNet $ 678,036,394
Holdings Count | Holding 37
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$678,036,394
Number of Portfolio Holdings
37
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
58.8%
U.S. Equity Funds
26.3
International Equity Funds
10.1
International Fixed Income Funds
2.5
Repurchase Agreements
1.3
U.S. Mixed Allocation Funds
0.9
International Alternative Funds
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
0.1
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
Transamerica Core Bond, Class I2
37.7%
Transamerica Bond, Class I2
12.2
Transamerica US Growth, Class I2
11.4
Transamerica Large Cap Value, Class I2
9.9
Transamerica International Equity, Class I2
4.0
Transamerica International Stock, Class I2
3.7
Transamerica Inflation Opportunities, Class I2
3.5
Transamerica Long Credit, Class I2
2.0
Transamerica Emerging Markets Debt, Class I2
1.9
Transamerica Bond, Class R6
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021271  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Growth Portfolio
Class Name Class A
Trading Symbol IAAAX
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
$24
0.47%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 $ 24
Expense Ratio, Percent 0.47% [11],[12]
AssetsNet $ 1,308,072,386
Holdings Count | Holding 22
InvestmentCompanyPortfolioTurnover 4.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,308,072,386
Number of Portfolio Holdings
22
Portfolio Turnover Rate
4%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
68.8%
International Equity Funds
27.2
Repurchase Agreements
2.0
U.S. Mixed Allocation Funds
1.7
International Alternative Funds
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
0.3
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
Transamerica US Growth, Class I2
30.9%
Transamerica Large Cap Value, Class I2
27.0
Transamerica International Equity, Class I2
12.1
Transamerica International Stock, Class I2
10.8
Transamerica Sustainable Equity Income, Class I2
3.2
Transamerica International Focus, Class I2
2.4
Transamerica Capital Growth, Class I2
1.8
Transamerica Energy Infrastructure, Class I2
1.7
Transamerica Mid Cap Growth, Class I2
1.4
Transamerica Small Cap Value, Class I2
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021273  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Growth Portfolio
Class Name Class C
Trading Symbol IAALX
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
$66
1.29%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 $ 66
Expense Ratio, Percent 1.29% [13],[14]
AssetsNet $ 1,308,072,386
Holdings Count | Holding 22
InvestmentCompanyPortfolioTurnover 4.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,308,072,386
Number of Portfolio Holdings
22
Portfolio Turnover Rate
4%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
68.8%
International Equity Funds
27.2
Repurchase Agreements
2.0
U.S. Mixed Allocation Funds
1.7
International Alternative Funds
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
0.3
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
Transamerica US Growth, Class I2
30.9%
Transamerica Large Cap Value, Class I2
27.0
Transamerica International Equity, Class I2
12.1
Transamerica International Stock, Class I2
10.8
Transamerica Sustainable Equity Income, Class I2
3.2
Transamerica International Focus, Class I2
2.4
Transamerica Capital Growth, Class I2
1.8
Transamerica Energy Infrastructure, Class I2
1.7
Transamerica Mid Cap Growth, Class I2
1.4
Transamerica Small Cap Value, Class I2
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000081835  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Growth Portfolio
Class Name Class I
Trading Symbol TAGIX
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
$7
0.14%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 $ 7
Expense Ratio, Percent 0.14% [15],[16]
AssetsNet $ 1,308,072,386
Holdings Count | Holding 22
InvestmentCompanyPortfolioTurnover 4.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,308,072,386
Number of Portfolio Holdings
22
Portfolio Turnover Rate
4%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
68.8%
International Equity Funds
27.2
Repurchase Agreements
2.0
U.S. Mixed Allocation Funds
1.7
International Alternative Funds
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
0.3
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
Transamerica US Growth, Class I2
30.9%
Transamerica Large Cap Value, Class I2
27.0
Transamerica International Equity, Class I2
12.1
Transamerica International Stock, Class I2
10.8
Transamerica Sustainable Equity Income, Class I2
3.2
Transamerica International Focus, Class I2
2.4
Transamerica Capital Growth, Class I2
1.8
Transamerica Energy Infrastructure, Class I2
1.7
Transamerica Mid Cap Growth, Class I2
1.4
Transamerica Small Cap Value, Class I2
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000035461  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Growth Portfolio
Class Name Class R
Trading Symbol IGWRX
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
$36
0.70%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 $ 36
Expense Ratio, Percent 0.70% [17],[18]
AssetsNet $ 1,308,072,386
Holdings Count | Holding 22
InvestmentCompanyPortfolioTurnover 4.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,308,072,386
Number of Portfolio Holdings
22
Portfolio Turnover Rate
4%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
68.8%
International Equity Funds
27.2
Repurchase Agreements
2.0
U.S. Mixed Allocation Funds
1.7
International Alternative Funds
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
0.3
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
Transamerica US Growth, Class I2
30.9%
Transamerica Large Cap Value, Class I2
27.0
Transamerica International Equity, Class I2
12.1
Transamerica International Stock, Class I2
10.8
Transamerica Sustainable Equity Income, Class I2
3.2
Transamerica International Focus, Class I2
2.4
Transamerica Capital Growth, Class I2
1.8
Transamerica Energy Infrastructure, Class I2
1.7
Transamerica Mid Cap Growth, Class I2
1.4
Transamerica Small Cap Value, Class I2
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000236144  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Growth Portfolio
Class Name Class R3
Trading Symbol TAAKX
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 R3
$12
0.24%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 $ 12
Expense Ratio, Percent 0.24% [19],[20]
AssetsNet $ 1,308,072,386
Holdings Count | Holding 22
InvestmentCompanyPortfolioTurnover 4.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,308,072,386
Number of Portfolio Holdings
22
Portfolio Turnover Rate
4%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
68.8%
International Equity Funds
27.2
Repurchase Agreements
2.0
U.S. Mixed Allocation Funds
1.7
International Alternative Funds
0.0Footnote Reference*
Net Other Assets (Liabilities)Footnote Reference^
0.3
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
Transamerica US Growth, Class I2
30.9%
Transamerica Large Cap Value, Class I2
27.0
Transamerica International Equity, Class I2
12.1
Transamerica International Stock, Class I2
10.8
Transamerica Sustainable Equity Income, Class I2
3.2
Transamerica International Focus, Class I2
2.4
Transamerica Capital Growth, Class I2
1.8
Transamerica Energy Infrastructure, Class I2
1.7
Transamerica Mid Cap Growth, Class I2
1.4
Transamerica Small Cap Value, Class I2
1.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021274  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Moderate Growth Portfolio
Class Name Class A
Trading Symbol IMLAX
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
$23
0.46%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 $ 23
Expense Ratio, Percent 0.46% [21],[22]
AssetsNet $ 1,677,865,083
Holdings Count | Holding 34
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,677,865,083
Number of Portfolio Holdings
34
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
51.4%
U.S. Fixed Income Funds
22.9
International Equity Funds
20.1
International Fixed Income Funds
2.4
Repurchase Agreements
1.9
U.S. Mixed Allocation Funds
1.3
International Alternative Funds
0.0Footnote Reference*
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
Transamerica US Growth, Class I2
22.5%
Transamerica Large Cap Value, Class I2
20.5
Transamerica Core Bond, Class I2
12.3
Transamerica International Stock, Class I2
7.9
Transamerica International Equity, Class I2
7.8
Transamerica Inflation Opportunities, Class I2
3.5
Transamerica Bond, Class I2
3.2
Transamerica Sustainable Equity Income, Class I2
2.6
Transamerica Emerging Markets Debt, Class I2
2.3
Transamerica Emerging Markets Equity, Class I2
2.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021276  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Moderate Growth Portfolio
Class Name Class C
Trading Symbol IMLLX
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
$64
1.27%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 $ 64
Expense Ratio, Percent 1.27% [23],[24]
AssetsNet $ 1,677,865,083
Holdings Count | Holding 34
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,677,865,083
Number of Portfolio Holdings
34
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
51.4%
U.S. Fixed Income Funds
22.9
International Equity Funds
20.1
International Fixed Income Funds
2.4
Repurchase Agreements
1.9
U.S. Mixed Allocation Funds
1.3
International Alternative Funds
0.0Footnote Reference*
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
Transamerica US Growth, Class I2
22.5%
Transamerica Large Cap Value, Class I2
20.5
Transamerica Core Bond, Class I2
12.3
Transamerica International Stock, Class I2
7.9
Transamerica International Equity, Class I2
7.8
Transamerica Inflation Opportunities, Class I2
3.5
Transamerica Bond, Class I2
3.2
Transamerica Sustainable Equity Income, Class I2
2.6
Transamerica Emerging Markets Debt, Class I2
2.3
Transamerica Emerging Markets Equity, Class I2
2.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000081836  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Moderate Growth Portfolio
Class Name Class I
Trading Symbol TMGIX
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
$7
0.14%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 $ 7
Expense Ratio, Percent 0.14% [25],[26]
AssetsNet $ 1,677,865,083
Holdings Count | Holding 34
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,677,865,083
Number of Portfolio Holdings
34
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
51.4%
U.S. Fixed Income Funds
22.9
International Equity Funds
20.1
International Fixed Income Funds
2.4
Repurchase Agreements
1.9
U.S. Mixed Allocation Funds
1.3
International Alternative Funds
0.0Footnote Reference*
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
Transamerica US Growth, Class I2
22.5%
Transamerica Large Cap Value, Class I2
20.5
Transamerica Core Bond, Class I2
12.3
Transamerica International Stock, Class I2
7.9
Transamerica International Equity, Class I2
7.8
Transamerica Inflation Opportunities, Class I2
3.5
Transamerica Bond, Class I2
3.2
Transamerica Sustainable Equity Income, Class I2
2.6
Transamerica Emerging Markets Debt, Class I2
2.3
Transamerica Emerging Markets Equity, Class I2
2.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000035462  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Moderate Growth Portfolio
Class Name Class R
Trading Symbol IMGRX
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
$36
0.70%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 $ 36
Expense Ratio, Percent 0.70% [27],[28]
AssetsNet $ 1,677,865,083
Holdings Count | Holding 34
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,677,865,083
Number of Portfolio Holdings
34
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
51.4%
U.S. Fixed Income Funds
22.9
International Equity Funds
20.1
International Fixed Income Funds
2.4
Repurchase Agreements
1.9
U.S. Mixed Allocation Funds
1.3
International Alternative Funds
0.0Footnote Reference*
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
Transamerica US Growth, Class I2
22.5%
Transamerica Large Cap Value, Class I2
20.5
Transamerica Core Bond, Class I2
12.3
Transamerica International Stock, Class I2
7.9
Transamerica International Equity, Class I2
7.8
Transamerica Inflation Opportunities, Class I2
3.5
Transamerica Bond, Class I2
3.2
Transamerica Sustainable Equity Income, Class I2
2.6
Transamerica Emerging Markets Debt, Class I2
2.3
Transamerica Emerging Markets Equity, Class I2
2.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000236145  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Moderate Growth Portfolio
Class Name Class R3
Trading Symbol TAALX
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 R3
$15
0.30%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 $ 15
Expense Ratio, Percent 0.30% [29],[30]
AssetsNet $ 1,677,865,083
Holdings Count | Holding 34
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,677,865,083
Number of Portfolio Holdings
34
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
51.4%
U.S. Fixed Income Funds
22.9
International Equity Funds
20.1
International Fixed Income Funds
2.4
Repurchase Agreements
1.9
U.S. Mixed Allocation Funds
1.3
International Alternative Funds
0.0Footnote Reference*
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
Transamerica US Growth, Class I2
22.5%
Transamerica Large Cap Value, Class I2
20.5
Transamerica Core Bond, Class I2
12.3
Transamerica International Stock, Class I2
7.9
Transamerica International Equity, Class I2
7.8
Transamerica Inflation Opportunities, Class I2
3.5
Transamerica Bond, Class I2
3.2
Transamerica Sustainable Equity Income, Class I2
2.6
Transamerica Emerging Markets Debt, Class I2
2.3
Transamerica Emerging Markets Equity, Class I2
2.2
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021277  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Moderate Portfolio
Class Name Class A
Trading Symbol IMOAX
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
$24
0.47%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 $ 24
Expense Ratio, Percent 0.47% [31],[32]
AssetsNet $ 1,111,868,723
Holdings Count | Holding 30
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,111,868,723
Number of Portfolio Holdings
30
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
43.3%
U.S. Equity Funds
37.2
International Equity Funds
14.5
International Fixed Income Funds
2.6
Repurchase Agreements
1.2
U.S. Mixed Allocation Funds
1.2
International Alternative Funds
0.0Footnote Reference*
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
Transamerica Core Bond, Class I2
26.5%
Transamerica US Growth, Class I2
16.2
Transamerica Large Cap Value, Class I2
14.6
Transamerica Bond, Class I2
9.2
Transamerica International Stock, Class I2
5.8
Transamerica International Equity, Class I2
5.8
Transamerica Inflation Opportunities, Class I2
3.6
Transamerica Emerging Markets Debt, Class I2
2.6
Transamerica Long Credit, Class I2
1.9
Transamerica Sustainable Equity Income, Class I2
1.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000021279  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Moderate Portfolio
Class Name Class C
Trading Symbol IMOLX
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
$65
1.28%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 $ 65
Expense Ratio, Percent 1.28% [33],[34]
AssetsNet $ 1,111,868,723
Holdings Count | Holding 30
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,111,868,723
Number of Portfolio Holdings
30
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
43.3%
U.S. Equity Funds
37.2
International Equity Funds
14.5
International Fixed Income Funds
2.6
Repurchase Agreements
1.2
U.S. Mixed Allocation Funds
1.2
International Alternative Funds
0.0Footnote Reference*
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
Transamerica Core Bond, Class I2
26.5%
Transamerica US Growth, Class I2
16.2
Transamerica Large Cap Value, Class I2
14.6
Transamerica Bond, Class I2
9.2
Transamerica International Stock, Class I2
5.8
Transamerica International Equity, Class I2
5.8
Transamerica Inflation Opportunities, Class I2
3.6
Transamerica Emerging Markets Debt, Class I2
2.6
Transamerica Long Credit, Class I2
1.9
Transamerica Sustainable Equity Income, Class I2
1.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000081837  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Moderate Portfolio
Class Name Class I
Trading Symbol TMMIX
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
$7
0.14%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 $ 7
Expense Ratio, Percent 0.14% [35],[36]
AssetsNet $ 1,111,868,723
Holdings Count | Holding 30
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,111,868,723
Number of Portfolio Holdings
30
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
43.3%
U.S. Equity Funds
37.2
International Equity Funds
14.5
International Fixed Income Funds
2.6
Repurchase Agreements
1.2
U.S. Mixed Allocation Funds
1.2
International Alternative Funds
0.0Footnote Reference*
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
Transamerica Core Bond, Class I2
26.5%
Transamerica US Growth, Class I2
16.2
Transamerica Large Cap Value, Class I2
14.6
Transamerica Bond, Class I2
9.2
Transamerica International Stock, Class I2
5.8
Transamerica International Equity, Class I2
5.8
Transamerica Inflation Opportunities, Class I2
3.6
Transamerica Emerging Markets Debt, Class I2
2.6
Transamerica Long Credit, Class I2
1.9
Transamerica Sustainable Equity Income, Class I2
1.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000035463  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Moderate Portfolio
Class Name Class R
Trading Symbol IMDRX
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
$35
0.69%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 $ 35
Expense Ratio, Percent 0.69% [37],[38]
AssetsNet $ 1,111,868,723
Holdings Count | Holding 30
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,111,868,723
Number of Portfolio Holdings
30
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
43.3%
U.S. Equity Funds
37.2
International Equity Funds
14.5
International Fixed Income Funds
2.6
Repurchase Agreements
1.2
U.S. Mixed Allocation Funds
1.2
International Alternative Funds
0.0Footnote Reference*
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
Transamerica Core Bond, Class I2
26.5%
Transamerica US Growth, Class I2
16.2
Transamerica Large Cap Value, Class I2
14.6
Transamerica Bond, Class I2
9.2
Transamerica International Stock, Class I2
5.8
Transamerica International Equity, Class I2
5.8
Transamerica Inflation Opportunities, Class I2
3.6
Transamerica Emerging Markets Debt, Class I2
2.6
Transamerica Long Credit, Class I2
1.9
Transamerica Sustainable Equity Income, Class I2
1.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000236146  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation - Moderate Portfolio
Class Name Class R3
Trading Symbol TAAMX
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 R3
$18
0.35%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 $ 18
Expense Ratio, Percent 0.35% [39],[40]
AssetsNet $ 1,111,868,723
Holdings Count | Holding 30
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,111,868,723
Number of Portfolio Holdings
30
Portfolio Turnover Rate
5%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
43.3%
U.S. Equity Funds
37.2
International Equity Funds
14.5
International Fixed Income Funds
2.6
Repurchase Agreements
1.2
U.S. Mixed Allocation Funds
1.2
International Alternative Funds
0.0Footnote Reference*
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
Transamerica Core Bond, Class I2
26.5%
Transamerica US Growth, Class I2
16.2
Transamerica Large Cap Value, Class I2
14.6
Transamerica Bond, Class I2
9.2
Transamerica International Stock, Class I2
5.8
Transamerica International Equity, Class I2
5.8
Transamerica Inflation Opportunities, Class I2
3.6
Transamerica Emerging Markets Debt, Class I2
2.6
Transamerica Long Credit, Class I2
1.9
Transamerica Sustainable Equity Income, Class I2
1.6
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171782  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation Intermediate Horizon
Class Name Class R
Trading Symbol TAARX
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
$30
0.60%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 $ 30
Expense Ratio, Percent 0.60% [41],[42]
AssetsNet $ 42,550,843
Holdings Count | Holding 12
InvestmentCompanyPortfolioTurnover 10.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$42,550,843
Number of Portfolio Holdings
12
Portfolio Turnover Rate
10%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
46.6%
U.S. Equity Funds
40.3
International Equity Funds
12.9
Money Market Funds
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
Transamerica Core Bond, Class I3
22.1%
Transamerica Large Value Opportunities, Class I3
14.4
Transamerica Large Growth, Class I3
13.3
Transamerica International Equity, Class I3
12.9
Transamerica Inflation Opportunities, Class I3
10.9
Transamerica Short-Term Bond, Class I3
7.5
Transamerica High Yield Bond, Class I3
6.1
Transamerica Small Cap Value, Class I3
3.4
Transamerica Mid Cap Growth, Class I3
3.1
Transamerica Mid Cap Value Opportunities, Class I3
3.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171783  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation Intermediate Horizon
Class Name Class R4
Trading Symbol TAAFX
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
$18
0.35%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 $ 18
Expense Ratio, Percent 0.35% [43],[44]
AssetsNet $ 42,550,843
Holdings Count | Holding 12
InvestmentCompanyPortfolioTurnover 10.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$42,550,843
Number of Portfolio Holdings
12
Portfolio Turnover Rate
10%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
46.6%
U.S. Equity Funds
40.3
International Equity Funds
12.9
Money Market Funds
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
Transamerica Core Bond, Class I3
22.1%
Transamerica Large Value Opportunities, Class I3
14.4
Transamerica Large Growth, Class I3
13.3
Transamerica International Equity, Class I3
12.9
Transamerica Inflation Opportunities, Class I3
10.9
Transamerica Short-Term Bond, Class I3
7.5
Transamerica High Yield Bond, Class I3
6.1
Transamerica Small Cap Value, Class I3
3.4
Transamerica Mid Cap Growth, Class I3
3.1
Transamerica Mid Cap Value Opportunities, Class I3
3.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171786  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation Long Horizon
Class Name Class R
Trading Symbol TALRX
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
$30
0.60%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 $ 30
Expense Ratio, Percent 0.60% [45],[46]
AssetsNet $ 60,967,958
Holdings Count | Holding 12
InvestmentCompanyPortfolioTurnover 11.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$60,967,958
Number of Portfolio Holdings
12
Portfolio Turnover Rate
11%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
65.9%
International Equity Funds
24.8
U.S. Fixed Income Funds
9.2
Money Market Funds
0.1
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
Transamerica International Equity, Class I3
24.8%
Transamerica Large Value Opportunities, Class I3
22.1
Transamerica Large Growth, Class I3
20.7
Transamerica Small Cap Value, Class I3
6.5
Transamerica Mid Cap Growth, Class I3
5.7
Transamerica Mid Cap Value Opportunities, Class I3
5.5
Transamerica Small Cap Growth, Class I3
5.4
Transamerica Core Bond, Class I3
3.7
Transamerica Inflation Opportunities, Class I3
3.0
Transamerica High Yield Bond, Class I3
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171787  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation Long Horizon
Class Name Class R4
Trading Symbol TALFX
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
$18
0.35%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 $ 18
Expense Ratio, Percent 0.35% [47],[48]
AssetsNet $ 60,967,958
Holdings Count | Holding 12
InvestmentCompanyPortfolioTurnover 11.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$60,967,958
Number of Portfolio Holdings
12
Portfolio Turnover Rate
11%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Equity Funds
65.9%
International Equity Funds
24.8
U.S. Fixed Income Funds
9.2
Money Market Funds
0.1
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
Transamerica International Equity, Class I3
24.8%
Transamerica Large Value Opportunities, Class I3
22.1
Transamerica Large Growth, Class I3
20.7
Transamerica Small Cap Value, Class I3
6.5
Transamerica Mid Cap Growth, Class I3
5.7
Transamerica Mid Cap Value Opportunities, Class I3
5.5
Transamerica Small Cap Growth, Class I3
5.4
Transamerica Core Bond, Class I3
3.7
Transamerica Inflation Opportunities, Class I3
3.0
Transamerica High Yield Bond, Class I3
1.9
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171788  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation Short Horizon
Class Name Class R
Trading Symbol TSHRX
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
$30
0.60%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 $ 30
Expense Ratio, Percent 0.60% [49],[50]
AssetsNet $ 6,210,318
Holdings Count | Holding 10
InvestmentCompanyPortfolioTurnover 16.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$6,210,318
Number of Portfolio Holdings
10
Portfolio Turnover Rate
16%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
89.0%
U.S. Equity Funds
8.8
International Equity Funds
2.1
Money Market Funds
0.1
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
Transamerica Core Bond, Class I3
44.0%
Transamerica Short-Term Bond, Class I3
17.5
Transamerica Inflation Opportunities, Class I3
16.9
Transamerica High Yield Bond, Class I3
10.6
Transamerica Large Value Opportunities, Class I3
3.4
Transamerica Large Growth, Class I3
3.2
Transamerica International Equity, Class I3
2.1
Transamerica Small Cap Value, Class I3
1.1
Transamerica Small Cap Growth, Class I3
1.1
Transamerica Government Money Market, Class I3, 3.29%
0.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
C000171789  
Shareholder Report [Line Items]  
Fund Name Transamerica Asset Allocation Short Horizon
Class Name Class R4
Trading Symbol TSHFX
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
$17
0.35%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 $ 17
Expense Ratio, Percent 0.35% [51],[52]
AssetsNet $ 6,210,318
Holdings Count | Holding 10
InvestmentCompanyPortfolioTurnover 16.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$6,210,318
Number of Portfolio Holdings
10
Portfolio Turnover Rate
16%
Holdings [Text Block]

Asset Allocation (Percentage of Net Assets)

Table Summary
U.S. Fixed Income Funds
89.0%
U.S. Equity Funds
8.8
International Equity Funds
2.1
Money Market Funds
0.1
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
Transamerica Core Bond, Class I3
44.0%
Transamerica Short-Term Bond, Class I3
17.5
Transamerica Inflation Opportunities, Class I3
16.9
Transamerica High Yield Bond, Class I3
10.6
Transamerica Large Value Opportunities, Class I3
3.4
Transamerica Large Growth, Class I3
3.2
Transamerica International Equity, Class I3
2.1
Transamerica Small Cap Value, Class I3
1.1
Transamerica Small Cap Growth, Class I3
1.1
Transamerica Government Money Market, Class I3, 3.29%
0.1
Updated Prospectus Web Address transamerica.com/investments/mutual-fund-prospectus
[1] Annualized
[2] Does not include expenses of the underlying investments in which the Fund invests.
[3] Annualized
[4] Does not include expenses of the underlying investments in which the Fund invests.
[5] Annualized
[6] Does not include expenses of the underlying investments in which the Fund invests.
[7] Annualized
[8] Does not include expenses of the underlying investments in which the Fund invests.
[9] Annualized
[10] Does not include expenses of the underlying investments in which the Fund invests.
[11] Annualized
[12] Does not include expenses of the underlying investments in which the Fund invests.
[13] Annualized
[14] Does not include expenses of the underlying investments in which the Fund invests.
[15] Annualized
[16] Does not include expenses of the underlying investments in which the Fund invests.
[17] Annualized
[18] Does not include expenses of the underlying investments in which the Fund invests.
[19] Annualized
[20] Does not include expenses of the underlying investments in which the Fund invests.
[21] Annualized
[22] Does not include expenses of the underlying investments in which the Fund invests.
[23] Annualized
[24] Does not include expenses of the underlying investments in which the Fund invests.
[25] Annualized
[26] Does not include expenses of the underlying investments in which the Fund invests.
[27] Annualized
[28] Does not include expenses of the underlying investments in which the Fund invests.
[29] Annualized
[30] Does not include expenses of the underlying investments in which the Fund invests.
[31] Annualized
[32] Does not include expenses of the underlying investments in which the Fund invests.
[33] Annualized
[34] Does not include expenses of the underlying investments in which the Fund invests.
[35] Annualized
[36] Does not include expenses of the underlying investments in which the Fund invests.
[37] Annualized
[38] Does not include expenses of the underlying investments in which the Fund invests.
[39] Annualized
[40] Does not include expenses of the underlying investments in which the Fund invests.
[41] Annualized
[42] Does not include expenses of the underlying investments in which the Fund invests.
[43] Annualized
[44] Does not include expenses of the underlying investments in which the Fund invests.
[45] Annualized
[46] Does not include expenses of the underlying investments in which the Fund invests.
[47] Annualized
[48] Does not include expenses of the underlying investments in which the Fund invests.
[49] Annualized
[50] Does not include expenses of the underlying investments in which the Fund invests.
[51] Annualized
[52] Does not include expenses of the underlying investments in which the Fund invests.