v3.25.2
Shareholder Report
 6 Months Ended
Jun. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name GAMCO GLOBAL SERIES FUNDS, INC
Entity Central Index Key 0000909504
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
C000002867  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Growth Fund
Class Name Class AAA
Trading Symbol GICPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Growth Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Growth Fund - Class AAA
$47
0.90%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

In the first half of 2025, the Gabelli Global Growth Fund underperformed its broad-based benchmark, the MSCI AC World Index and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classif. The Trump Admin’s reciprocal tariff program proposed in early-April, if enacted, may result in higher prices and slower growth. Absent these risks, the US economy remains on stable footing, upheld by low unemployment and positive GDP growth. Separately, the artificial intelligence space has seen end user adoption bend positively this year, bringing large infrastructure investments from scaled players. As a result, many of our large technology holdings performed well.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Growth Fund - Class AAA
MSCI ACWI Index
Lipper Global Large-Cap Growth Fund Classification
6/15
10,000
10,000
10,000
6/16
9,490
9,683
9,747
6/17
11,228
11,563
11,625
6/18
13,552
12,871
13,240
6/19
14,938
13,685
14,563
6/20
17,431
14,046
16,182
6/21
23,726
19,646
22,265
6/22
16,768
16,627
16,674
6/23
20,794
19,475
19,929
6/24
27,455
23,354
24,036
6/25
31,169
27,252
27,394
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Growth Fund - Class AAA
8.85%
13.53%
12.33%
12.04%
MSCI ACWI Index
10.33%
16.69%
14.18%
10.55%
Lipper Global Large-Cap Growth Fund Classification
9.58%
13.97%
11.10%
10.60%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 198,019,997
Holdings Count | Holding 60
Advisory Fees Paid, Amount $ 485,570
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$198,019,997
  • Number of Portfolio Holdings60
  • Portfolio Turnover Rate8%
  • Management Fees$485,570
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
87.0%
U.S. Government Obligations
13.2%
Other Assets and Liabilities (Net)
(0.2)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Information Technology - Semiconductors, Hardware, and Equipment
15.0%
Financials
14.9%
U.S. Government Obligations
13.2%
Industrials
13.1%
Information Technology - Software and Services
12.4%
Communication Services
12.3%
Health Care
9.1%
Consumer Discretionary
8.0%
Other Industry sectors
2.2%
Other Assets and Liabilities (Net)
(0.2)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Microsoft Corp.
6.2%
NVIDIA Corp.
5.9%
Netflix Inc.
4.4%
Amazon.com Inc.
4.2%
Eli Lilly & Co.
3.3%
Meta Platforms Inc.
3.3%
Broadcom Inc.
3.2%
Visa Inc.
3.1%
Alphabet Inc.
2.6%
General Electric Co.
2.6%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000002869  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Growth Fund
Class Name Class C
Trading Symbol GGGCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Growth Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Growth Fund - Class C
$47
0.90%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

In the first half of 2025, the Gabelli Global Growth Fund underperformed its broad-based benchmark, the MSCI AC World Index and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classif. The Trump Admin’s reciprocal tariff program proposed in early-April, if enacted, may result in higher prices and slower growth. Absent these risks, the US economy remains on stable footing, upheld by low unemployment and positive GDP growth. Separately, the artificial intelligence space has seen end user adoption bend positively this year, bringing large infrastructure investments from scaled players. As a result, many of our large technology holdings performed well.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Growth Fund - Class C
The Gabelli Global Growth Fund - Class C (includes sales charge)
MSCI ACWI Index
Lipper Global Large-Cap Growth Fund Classification
6/15
10,000
10,000
10,000
10,000
6/16
9,421
9,327
9,683
9,747
6/17
11,062
10,858
11,563
11,625
6/18
13,253
12,901
12,871
13,240
6/19
14,498
13,983
13,685
14,563
6/20
16,866
16,127
14,046
16,182
6/21
22,955
21,789
19,646
22,265
6/22
16,225
15,247
16,627
16,674
6/23
20,120
18,754
19,475
19,929
6/24
26,565
24,574
23,354
24,036
6/25
30,157
27,651
27,252
27,394
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Growth Fund - Class C
8.84%
13.52%
12.32%
11.67%
The Gabelli Global Growth Fund - Class C (includes sales charge)
7.84%
12.52%
12.32%
11.67%
MSCI ACWI Index
10.33%
16.69%
14.18%
10.55%
Lipper Global Large-Cap Growth Fund Classification
9.58%
13.97%
11.10%
10.60%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 198,019,997
Holdings Count | Holding 60
Advisory Fees Paid, Amount $ 485,570
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$198,019,997
  • Number of Portfolio Holdings60
  • Portfolio Turnover Rate8%
  • Management Fees$485,570
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
87.0%
U.S. Government Obligations
13.2%
Other Assets and Liabilities (Net)
(0.2)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Information Technology - Semiconductors, Hardware, and Equipment
15.0%
Financials
14.9%
U.S. Government Obligations
13.2%
Industrials
13.1%
Information Technology - Software and Services
12.4%
Communication Services
12.3%
Health Care
9.1%
Consumer Discretionary
8.0%
Other Industry sectors
2.2%
Other Assets and Liabilities (Net)
(0.2)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Microsoft Corp.
6.2%
NVIDIA Corp.
5.9%
Netflix Inc.
4.4%
Amazon.com Inc.
4.2%
Eli Lilly & Co.
3.3%
Meta Platforms Inc.
3.3%
Broadcom Inc.
3.2%
Visa Inc.
3.1%
Alphabet Inc.
2.6%
General Electric Co.
2.6%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000034309  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Growth Fund
Class Name Class I
Trading Symbol GGGIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Growth Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Growth Fund - Class I
$47
0.90%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

In the first half of 2025, the Gabelli Global Growth Fund underperformed its broad-based benchmark, the MSCI AC World Index and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classif. The Trump Admin’s reciprocal tariff program proposed in early-April, if enacted, may result in higher prices and slower growth. Absent these risks, the US economy remains on stable footing, upheld by low unemployment and positive GDP growth. Separately, the artificial intelligence space has seen end user adoption bend positively this year, bringing large infrastructure investments from scaled players. As a result, many of our large technology holdings performed well.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Growth Fund - Class I
MSCI ACWI Index
Lipper Global Large-Cap Growth Fund Classification
6/15
10,000
10,000
10,000
6/16
9,558
9,683
9,747
6/17
11,387
11,563
11,625
6/18
13,828
12,871
13,240
6/19
15,283
13,685
14,563
6/20
17,850
14,046
16,182
6/21
24,292
19,646
22,265
6/22
17,169
16,627
16,674
6/23
21,297
19,475
19,929
6/24
28,124
23,354
24,036
6/25
31,924
27,252
27,394
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Growth Fund - Class I
8.83%
13.51%
12.33%
12.31%
MSCI ACWI Index
10.33%
16.69%
14.18%
10.55%
Lipper Global Large-Cap Growth Fund Classification
9.58%
13.97%
11.10%
10.60%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 198,019,997
Holdings Count | Holding 60
Advisory Fees Paid, Amount $ 485,570
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$198,019,997
  • Number of Portfolio Holdings60
  • Portfolio Turnover Rate8%
  • Management Fees$485,570
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
87.0%
U.S. Government Obligations
13.2%
Other Assets and Liabilities (Net)
(0.2)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Information Technology - Semiconductors, Hardware, and Equipment
15.0%
Financials
14.9%
U.S. Government Obligations
13.2%
Industrials
13.1%
Information Technology - Software and Services
12.4%
Communication Services
12.3%
Health Care
9.1%
Consumer Discretionary
8.0%
Other Industry sectors
2.2%
Other Assets and Liabilities (Net)
(0.2)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Microsoft Corp.
6.2%
NVIDIA Corp.
5.9%
Netflix Inc.
4.4%
Amazon.com Inc.
4.2%
Eli Lilly & Co.
3.3%
Meta Platforms Inc.
3.3%
Broadcom Inc.
3.2%
Visa Inc.
3.1%
Alphabet Inc.
2.6%
General Electric Co.
2.6%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000002866  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Growth Fund
Class Name Class A
Trading Symbol GGGAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Growth Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Growth Fund - Class A
$47
0.90%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

In the first half of 2025, the Gabelli Global Growth Fund underperformed its broad-based benchmark, the MSCI AC World Index and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classif. The Trump Admin’s reciprocal tariff program proposed in early-April, if enacted, may result in higher prices and slower growth. Absent these risks, the US economy remains on stable footing, upheld by low unemployment and positive GDP growth. Separately, the artificial intelligence space has seen end user adoption bend positively this year, bringing large infrastructure investments from scaled players. As a result, many of our large technology holdings performed well.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Growth Fund - Class A
The Gabelli Global Growth Fund - Class A (includes sales charge)
MSCI ACWI Index
Lipper Global Large-Cap Growth Fund Classification
6/15
10,000
10,000
10,000
10,000
6/16
9,493
8,947
9,683
9,747
6/17
11,229
9,975
11,563
11,625
6/18
13,555
11,349
12,871
13,240
6/19
14,937
11,787
13,685
14,563
6/20
17,432
12,964
14,046
16,182
6/21
23,725
16,630
19,646
22,265
6/22
16,763
11,074
16,627
16,674
6/23
20,792
12,946
19,475
19,929
6/24
27,451
16,110
23,354
24,036
6/25
31,162
17,236
27,252
27,394
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Growth Fund - Class A
8.84%
13.52%
12.32%
12.04%
The Gabelli Global Growth Fund - Class A (includes sales charge)
2.58%
6.99%
11.00%
11.38%
MSCI ACWI Index
10.33%
16.69%
14.18%
10.55%
Lipper Global Large-Cap Growth Fund Classification
9.58%
13.97%
11.10%
10.60%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 198,019,997
Holdings Count | Holding 60
Advisory Fees Paid, Amount $ 485,570
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$198,019,997
  • Number of Portfolio Holdings60
  • Portfolio Turnover Rate8%
  • Management Fees$485,570
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
87.0%
U.S. Government Obligations
13.2%
Other Assets and Liabilities (Net)
(0.2)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Information Technology - Semiconductors, Hardware, and Equipment
15.0%
Financials
14.9%
U.S. Government Obligations
13.2%
Industrials
13.1%
Information Technology - Software and Services
12.4%
Communication Services
12.3%
Health Care
9.1%
Consumer Discretionary
8.0%
Other Industry sectors
2.2%
Other Assets and Liabilities (Net)
(0.2)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Microsoft Corp.
6.2%
NVIDIA Corp.
5.9%
Netflix Inc.
4.4%
Amazon.com Inc.
4.2%
Eli Lilly & Co.
3.3%
Meta Platforms Inc.
3.3%
Broadcom Inc.
3.2%
Visa Inc.
3.1%
Alphabet Inc.
2.6%
General Electric Co.
2.6%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000002875  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Content & Connectivity Fund
Class Name Class AAA
Trading Symbol GABTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Content & Connectivity Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Content & Connectivity Fund - Class AAA
$48
0.90%
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli Global Content & Connectivity Fund outperformed its broad-based benchmark, the MSCI All Country World Index (ACWI), and underperformed its comparative benchmark, the MSCI AC World Communication Services Index. The difference in performance was largely driven by the Fund’s lower weights in online-related mega-cap stocks, to avoid excessive concentration. Top contributors to our Fund included firms benefiting from continued optimism around artificial intelligence ecosystem and rising demand for AI chips, strength and scale in digital advertising, solid wireless operating performance and improved cash flow generation.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Content & Connectivity Fund - Class AAA
MSCI ACWI Index
MSCI AC World Communication Services Index
6/15
10,000
10,000
10,000
6/16
9,795
9,683
10,337
6/17
10,375
11,563
10,183
6/18
10,312
12,871
9,838
6/19
10,612
13,685
11,184
6/20
10,288
14,046
12,225
6/21
14,365
19,646
17,408
6/22
10,339
16,627
12,257
6/23
10,952
19,475
13,587
6/24
13,459
23,354
18,014
6/25
16,455
27,252
22,668
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Content & Connectivity Fund - Class AAA
13.30%
22.26%
9.85%
5.11%
MSCI ACWI Index
10.33%
16.69%
14.18%
10.55%
MSCI AC World Communication Services Index
14.98%
25.84%
13.14%
8.53%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 71,194,066
Holdings Count | Holding 47
Advisory Fees Paid, Amount $ 77,956
InvestmentCompanyPortfolioTurnover 3.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$71,194,066
  • Number of Portfolio Holdings47
  • Portfolio Turnover Rate3%
  • Management Fees$77,956
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
99.5%
Preferred Stocks
0.6%
Other Assets and Liabilities (Net)
(0.1)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Communication Services
73.5%
Consumer Discretionary
11.2%
Information Technology
6.1%
Financials
5.8%
Real Estate
3.5%
Other Assets and Liabilities (Net)
(0.1)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

SoftBank Group Corp.
7.6%
T-Mobile US Inc.
7.5%
Meta Platforms Inc.
7.3%
Prosus NV
6.3%
Alphabet Inc.
5.7%
Deutsche Telekom AG
5.6%
Millicom International Cellular SA
4.2%
Microsoft Corp.
4.2%
Telephone and Data Systems Inc.
3.8%
United States Cellular Corp.
3.6%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000002877  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Content & Connectivity Fund
Class Name Class C
Trading Symbol GTCCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Content & Connectivity Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Content & Connectivity Fund - Class C
$49
0.90%
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli Global Content & Connectivity Fund outperformed its broad-based benchmark, the MSCI All Country World Index (ACWI), and underperformed its comparative benchmark, the MSCI AC World Communication Services Index. The difference in performance was largely driven by the Fund’s lower weights in online-related mega-cap stocks, to avoid excessive concentration. Top contributors to our Fund included firms benefiting from continued optimism around artificial intelligence ecosystem and rising demand for AI chips, strength and scale in digital advertising, solid wireless operating performance and improved cash flow generation.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Content & Connectivity Fund - Class C
The Gabelli Global Content & Connectivity Fund - Class C (includes sales charge)
MSCI ACWI Index
MSCI AC World Communication Services Index
6/15
10,000
10,000
10,000
10,000
6/16
9,720
9,623
9,683
10,337
6/17
10,216
10,018
11,563
10,183
6/18
10,078
9,783
12,871
9,838
6/19
10,293
9,895
13,685
11,184
6/20
9,948
9,467
14,046
12,225
6/21
13,888
13,122
19,646
17,408
6/22
9,998
9,352
16,627
12,257
6/23
10,534
9,760
19,475
13,587
6/24
12,954
11,905
23,354
18,014
6/25
16,880
15,393
27,252
22,668
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Content & Connectivity Fund - Class C
20.87%
30.31%
11.16%
5.38%
The Gabelli Global Content & Connectivity Fund - Class C (includes sales charge)
19.87%
29.31%
11.16%
5.38%
MSCI ACWI Index
10.33%
16.69%
14.18%
10.55%
MSCI AC World Communication Services Index
14.98%
25.84%
13.14%
8.53%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 71,194,066
Holdings Count | Holding 47
Advisory Fees Paid, Amount $ 77,956
InvestmentCompanyPortfolioTurnover 3.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$71,194,066
  • Number of Portfolio Holdings47
  • Portfolio Turnover Rate3%
  • Management Fees$77,956
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
99.5%
Preferred Stocks
0.6%
Other Assets and Liabilities (Net)
(0.1)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Communication Services
73.5%
Consumer Discretionary
11.2%
Information Technology
6.1%
Financials
5.8%
Real Estate
3.5%
Other Assets and Liabilities (Net)
(0.1)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

SoftBank Group Corp.
7.6%
T-Mobile US Inc.
7.5%
Meta Platforms Inc.
7.3%
Prosus NV
6.3%
Alphabet Inc.
5.7%
Deutsche Telekom AG
5.6%
Millicom International Cellular SA
4.2%
Microsoft Corp.
4.2%
Telephone and Data Systems Inc.
3.8%
United States Cellular Corp.
3.6%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000034311  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Content & Connectivity Fund
Class Name Class I
Trading Symbol GTTIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Content & Connectivity Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Content & Connectivity Fund - Class I
$48
0.90%
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli Global Content & Connectivity Fund outperformed its broad-based benchmark, the MSCI All Country World Index (ACWI), and underperformed its comparative benchmark, the MSCI AC World Communication Services Index. The difference in performance was largely driven by the Fund’s lower weights in online-related mega-cap stocks, to avoid excessive concentration. Top contributors to our Fund included firms benefiting from continued optimism around artificial intelligence ecosystem and rising demand for AI chips, strength and scale in digital advertising, solid wireless operating performance and improved cash flow generation.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Content & Connectivity Fund - Class I
MSCI ACWI Index
MSCI AC World Communication Services Index
6/15
10,000
10,000
10,000
6/16
9,819
9,683
10,337
6/17
10,445
11,563
10,183
6/18
10,462
12,871
9,838
6/19
10,847
13,685
11,184
6/20
10,552
14,046
12,225
6/21
14,728
19,646
17,408
6/22
10,598
16,627
12,257
6/23
11,229
19,475
13,587
6/24
13,802
23,354
18,014
6/25
16,876
27,252
22,668
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Content & Connectivity Fund - Class I
13.35%
22.27%
9.85%
5.37%
MSCI ACWI Index
10.33%
16.69%
14.18%
10.55%
MSCI AC World Communication Services Index
14.98%
25.84%
13.14%
8.53%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 71,194,066
Holdings Count | Holding 47
Advisory Fees Paid, Amount $ 77,956
InvestmentCompanyPortfolioTurnover 3.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$71,194,066
  • Number of Portfolio Holdings47
  • Portfolio Turnover Rate3%
  • Management Fees$77,956
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
99.5%
Preferred Stocks
0.6%
Other Assets and Liabilities (Net)
(0.1)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Communication Services
73.5%
Consumer Discretionary
11.2%
Information Technology
6.1%
Financials
5.8%
Real Estate
3.5%
Other Assets and Liabilities (Net)
(0.1)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

SoftBank Group Corp.
7.6%
T-Mobile US Inc.
7.5%
Meta Platforms Inc.
7.3%
Prosus NV
6.3%
Alphabet Inc.
5.7%
Deutsche Telekom AG
5.6%
Millicom International Cellular SA
4.2%
Microsoft Corp.
4.2%
Telephone and Data Systems Inc.
3.8%
United States Cellular Corp.
3.6%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000002874  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Content & Connectivity Fund
Class Name Class A
Trading Symbol GTCAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Content & Connectivity Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Content & Connectivity Fund - Class A
$48
0.90%
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli Global Content & Connectivity Fund outperformed its broad-based benchmark, the MSCI All Country World Index (ACWI), and underperformed its comparative benchmark, the MSCI AC World Communication Services Index. The difference in performance was largely driven by the Fund’s lower weights in online-related mega-cap stocks, to avoid excessive concentration. Top contributors to our Fund included firms benefiting from continued optimism around artificial intelligence ecosystem and rising demand for AI chips, strength and scale in digital advertising, solid wireless operating performance and improved cash flow generation.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Content & Connectivity Fund - Class A
The Gabelli Global Content & Connectivity Fund - Class A (includes sales charge)
MSCI ACWI Index
MSCI AC World Communication Services Index
6/15
10,000
10,000
10,000
10,000
6/16
9,793
9,230
9,683
10,337
6/17
10,357
9,200
11,563
10,183
6/18
10,295
8,619
12,871
9,838
6/19
10,596
8,362
13,685
11,184
6/20
10,269
7,637
14,046
12,225
6/21
14,337
10,050
19,646
17,408
6/22
10,319
6,817
16,627
12,257
6/23
10,932
6,807
19,475
13,587
6/24
13,435
7,885
23,354
18,014
6/25
16,427
9,086
27,252
22,668
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Content & Connectivity Fund - Class A
13.35%
22.27%
9.85%
5.09%
The Gabelli Global Content & Connectivity Fund - Class A (includes sales charge)
6.84%
15.24%
8.56%
4.47%
MSCI ACWI Index
10.33%
16.69%
14.18%
10.55%
MSCI AC World Communication Services Index
14.98%
25.84%
13.14%
8.53%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 71,194,066
Holdings Count | Holding 47
Advisory Fees Paid, Amount $ 77,956
InvestmentCompanyPortfolioTurnover 3.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$71,194,066
  • Number of Portfolio Holdings47
  • Portfolio Turnover Rate3%
  • Management Fees$77,956
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
99.5%
Preferred Stocks
0.6%
Other Assets and Liabilities (Net)
(0.1)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Communication Services
73.5%
Consumer Discretionary
11.2%
Information Technology
6.1%
Financials
5.8%
Real Estate
3.5%
Other Assets and Liabilities (Net)
(0.1)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

SoftBank Group Corp.
7.6%
T-Mobile US Inc.
7.5%
Meta Platforms Inc.
7.3%
Prosus NV
6.3%
Alphabet Inc.
5.7%
Deutsche Telekom AG
5.6%
Millicom International Cellular SA
4.2%
Microsoft Corp.
4.2%
Telephone and Data Systems Inc.
3.8%
United States Cellular Corp.
3.6%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000204772  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Mini Mites Fund
Class Name Class A
Trading Symbol GMNAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Mini Mites Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Mini Mites Fund - Class A
$45
0.90%
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, the Gabelli Global Mini Mites Fund outperformed its broad-based benchmark, the Russell 2000 Index, while underperforming its comparative benchmarks, the MSCI World Micro-Cap and the S&P Developed Small Cap Indices. First half performance was affected by April 2 'Liberation Day' tariffs, the subsequent pause, and concerns over interest rates and inflation. Further clarity on tariffs and expectations of lower interest rates in the second half could provide a more favorable environment.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Mini Mites Fund - Class A
The Gabelli Global Mini Mites Fund - Class A (includes sales charge)
Russell 2000 Index
MSCI World Micro Cap Index
S&P Developed Small Cap Index
10/18
10,000
10,000
10,000
10,000
10,000
6/19
9,279
8,745
9,669
9,044
9,824
6/20
7,686
6,827
9,028
8,790
9,283
6/21
14,538
12,171
14,628
14,527
14,169
6/22
10,883
8,587
10,942
10,864
11,019
6/23
13,102
9,743
12,289
11,157
12,531
6/24
14,556
10,203
13,525
11,724
13,737
6/25
17,133
11,318
14,564
14,116
15,625
Average Annual Return [Table Text Block]
Fund
6 months
1 Year
5 Year
Since Inception (10/1/2018)
The Gabelli Global Mini Mites Fund - Class A
(0.27)%
17.70%
17.39%
8.31%
The Gabelli Global Mini Mites Fund - Class A (includes sales charge)
(6.01)%
10.93%
16.01%
7.36%
Russell 2000 Index
(1.79)%
7.68%
10.04%
5.40%
MSCI World Micro Cap Index
13.55%
20.52%
9.95%
5.36%
S&P Developed Small Cap Index
6.84%
13.75%
10.98%
6.55%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 15,479,390
Holdings Count | Holding 154
Advisory Fees Paid, Amount $ (18,279)
InvestmentCompanyPortfolioTurnover 13.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$15,479,390
  • Number of Portfolio Holdings154
  • Portfolio Turnover Rate13%
  • Management Fees$(18,279)
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
73.3%
U.S. Government Obligations
36.9%
Other Assets and Liabilities (Net)
(10.2)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
U.S. Government Obligations
36.9%
Metals and Mining
10.1%
Diversified Industrial
9.0%
Hotels and Gaming
5.8%
Automotive: Parts and Accessories
5.8%
Health Care
5.4%
Aerospace and Defense
5.1%
Consumer Products
5.1%
Other Industry sectors
27.0%
Other Assets and Liabilities (Net)
(10.2)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Tredegar Corp.
6.5%
Ampco-Pittsburgh Corp.
2.3%
Avio SpA
2.2%
Myers Industries Inc.
2.1%
Velan Inc.
1.9%
L.B. Foster Co.
1.7%
Standard Motor Products Inc.
1.7%
Clarus Corp.
1.6%
Monro Inc.
1.5%
Ollamani SAB
1.4%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000204774  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Mini Mites Fund
Class Name Class C
Trading Symbol GMNCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Mini Mites Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Mini Mites Fund - Class C
$45
0.90%
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, the Gabelli Global Mini Mites Fund outperformed its broad-based benchmark, the Russell 2000 Index, while underperforming its comparative benchmarks, the MSCI World Micro-Cap and the S&P Developed Small Cap Indices. First half performance was affected by April 2 'Liberation Day' tariffs, the subsequent pause, and concerns over interest rates and inflation. Further clarity on tariffs and expectations of lower interest rates in the second half could provide a more favorable environment.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Mini Mites Fund - Class C
The Gabelli Global Mini Mites Fund - Class C (includes sales charge)
Russell 2000 Index
MSCI World Micro Cap Index
S&P Developed Small Cap Index
10/18
10,000
10,000
10,000
10,000
10,000
6/19
9,243
9,343
9,669
9,044
9,824
6/20
7,633
7,638
9,028
8,790
9,283
6/21
14,435
14,369
14,628
14,527
14,169
6/22
10,807
10,650
10,942
10,864
11,019
6/23
13,003
12,707
12,289
11,157
12,531
6/24
14,446
13,990
13,525
11,724
13,737
6/25
17,009
16,333
14,564
14,116
15,625
Average Annual Return [Table Text Block]
Fund
6 months
1 Year
5 Year
Since Inception (10/1/2018)
The Gabelli Global Mini Mites Fund - Class C
(0.18)%
17.74%
17.38%
8.19%
The Gabelli Global Mini Mites Fund - Class C (includes sales charge)
(1.18)%
16.74%
17.38%
8.19%
Russell 2000 Index
(1.79)%
7.68%
10.04%
5.40%
MSCI World Micro Cap Index
13.55%
20.52%
9.95%
5.36%
S&P Developed Small Cap Index
6.84%
13.75%
10.98%
6.55%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 15,479,390
Holdings Count | Holding 154
Advisory Fees Paid, Amount $ (18,279)
InvestmentCompanyPortfolioTurnover 13.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$15,479,390
  • Number of Portfolio Holdings154
  • Portfolio Turnover Rate13%
  • Management Fees$(18,279)
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
73.3%
U.S. Government Obligations
36.9%
Other Assets and Liabilities (Net)
(10.2)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
U.S. Government Obligations
36.9%
Metals and Mining
10.1%
Diversified Industrial
9.0%
Hotels and Gaming
5.8%
Automotive: Parts and Accessories
5.8%
Health Care
5.4%
Aerospace and Defense
5.1%
Consumer Products
5.1%
Other Industry sectors
27.0%
Other Assets and Liabilities (Net)
(10.2)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Tredegar Corp.
6.5%
Ampco-Pittsburgh Corp.
2.3%
Avio SpA
2.2%
Myers Industries Inc.
2.1%
Velan Inc.
1.9%
L.B. Foster Co.
1.7%
Standard Motor Products Inc.
1.7%
Clarus Corp.
1.6%
Monro Inc.
1.5%
Ollamani SAB
1.4%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000204771  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Mini Mites Fund
Class Name Class I
Trading Symbol GGMMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Mini Mites Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Mini Mites Fund - Class I
$45
0.90%
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, the Gabelli Global Mini Mites Fund outperformed its broad-based benchmark, the Russell 2000 Index, while underperforming its comparative benchmarks, the MSCI World Micro-Cap and the S&P Developed Small Cap Indices. First half performance was affected by April 2 'Liberation Day' tariffs, the subsequent pause, and concerns over interest rates and inflation. Further clarity on tariffs and expectations of lower interest rates in the second half could provide a more favorable environment.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Mini Mites Fund - Class I
Russell 2000 Index
MSCI World Micro Cap Index
S&P Developed Small Cap Index
10/18
10,000
10,000
10,000
10,000
6/19
9,296
9,669
9,044
9,824
6/20
7,719
9,028
8,790
9,283
6/21
14,591
14,628
14,527
14,169
6/22
10,914
10,942
10,864
11,019
6/23
13,151
12,289
11,157
12,531
6/24
14,596
13,525
11,724
13,737
6/25
17,180
14,564
14,116
15,625
Average Annual Return [Table Text Block]
Fund
6 months
1 Year
5 Year
Since Inception (10/1/2018)
The Gabelli Global Mini Mites Fund - Class I
(0.27)%
17.71%
17.35%
8.35%
Russell 2000 Index
(1.79)%
7.68%
10.04%
5.40%
MSCI World Micro Cap Index
13.55%
20.52%
9.95%
5.36%
S&P Developed Small Cap Index
6.84%
13.75%
10.98%
6.55%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 15,479,390
Holdings Count | Holding 154
Advisory Fees Paid, Amount $ (18,279)
InvestmentCompanyPortfolioTurnover 13.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$15,479,390
  • Number of Portfolio Holdings154
  • Portfolio Turnover Rate13%
  • Management Fees$(18,279)
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
73.3%
U.S. Government Obligations
36.9%
Other Assets and Liabilities (Net)
(10.2)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
U.S. Government Obligations
36.9%
Metals and Mining
10.1%
Diversified Industrial
9.0%
Hotels and Gaming
5.8%
Automotive: Parts and Accessories
5.8%
Health Care
5.4%
Aerospace and Defense
5.1%
Consumer Products
5.1%
Other Industry sectors
27.0%
Other Assets and Liabilities (Net)
(10.2)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Tredegar Corp.
6.5%
Ampco-Pittsburgh Corp.
2.3%
Avio SpA
2.2%
Myers Industries Inc.
2.1%
Velan Inc.
1.9%
L.B. Foster Co.
1.7%
Standard Motor Products Inc.
1.7%
Clarus Corp.
1.6%
Monro Inc.
1.5%
Ollamani SAB
1.4%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000204773  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Mini Mites Fund
Class Name Class AAA
Trading Symbol GAMNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Mini Mites Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Mini Mites Fund - Class AAA
$45
0.90%
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, the Gabelli Global Mini Mites Fund outperformed its broad-based benchmark, the Russell 2000 Index, while underperforming its comparative benchmarks, the MSCI World Micro-Cap and the S&P Developed Small Cap Indices. First half performance was affected by April 2 'Liberation Day' tariffs, the subsequent pause, and concerns over interest rates and inflation. Further clarity on tariffs and expectations of lower interest rates in the second half could provide a more favorable environment.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Mini Mites Fund - Class AAA
Russell 2000 Index
MSCI World Micro Cap Index
S&P Developed Small Cap Index
10/18
10,000
10,000
10,000
10,000
6/19
9,290
9,669
9,044
9,824
6/20
7,699
9,028
8,790
9,283
6/21
14,553
14,628
14,527
14,169
6/22
10,885
10,942
10,864
11,019
6/23
13,117
12,289
11,157
12,531
6/24
14,558
13,525
11,724
13,737
6/25
17,136
14,564
14,116
15,625
Average Annual Return [Table Text Block]
Fund
6 months
1 Year
5 Year
Since Inception (10/1/2018)
The Gabelli Global Mini Mites Fund - Class AAA
(0.27)%
17.71%
17.35%
8.31%
Russell 2000 Index
(1.79)%
7.68%
10.04%
5.40%
MSCI World Micro Cap Index
13.55%
20.52%
9.95%
5.36%
S&P Developed Small Cap Index
6.84%
13.75%
10.98%
6.55%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 15,479,390
Holdings Count | Holding 154
Advisory Fees Paid, Amount $ (18,279)
InvestmentCompanyPortfolioTurnover 13.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$15,479,390
  • Number of Portfolio Holdings154
  • Portfolio Turnover Rate13%
  • Management Fees$(18,279)
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
73.3%
U.S. Government Obligations
36.9%
Other Assets and Liabilities (Net)
(10.2)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
U.S. Government Obligations
36.9%
Metals and Mining
10.1%
Diversified Industrial
9.0%
Hotels and Gaming
5.8%
Automotive: Parts and Accessories
5.8%
Health Care
5.4%
Aerospace and Defense
5.1%
Consumer Products
5.1%
Other Industry sectors
27.0%
Other Assets and Liabilities (Net)
(10.2)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Tredegar Corp.
6.5%
Ampco-Pittsburgh Corp.
2.3%
Avio SpA
2.2%
Myers Industries Inc.
2.1%
Velan Inc.
1.9%
L.B. Foster Co.
1.7%
Standard Motor Products Inc.
1.7%
Clarus Corp.
1.6%
Monro Inc.
1.5%
Ollamani SAB
1.4%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000002865  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Rising Income and Dividend Fund
Class Name Class AAA
Trading Symbol GAGCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Rising Income and Dividend Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Rising Income and Dividend Fund - Class AAA
$48
0.90%
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli Global Rising Income & Dividend Fund (GRID) outperformed its broad-based benchmark, the MSCI World Index and its comparative, the Lipper Global Large-Cap Growth Fund Classification. Global stock markets were dominated by the ongoing tariff negotiations, but settled towards the end of the first half as some new deals were made at lower levels than had been anticipated. Interest rates remained unchanged in the first half. International markets saw modest gains, while the U.S. markets saw strong gains.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Rising Income and Dividend Fund - Class AAA
MSCI World Index
Lipper Global Large-Cap Growth Fund Classification
6/15
10,000
10,000
10,000
6/16
10,133
9,781
9,747
6/17
11,697
11,626
11,625
6/18
12,123
12,986
13,240
6/19
11,890
13,887
14,563
6/20
10,614
14,359
16,182
6/21
15,882
20,056
22,265
6/22
13,360
17,260
16,674
6/23
15,241
20,562
19,929
6/24
15,300
24,828
24,036
6/25
17,925
28,989
27,394
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Rising Income and Dividend Fund - Class AAA
12.97%
17.16%
11.05%
6.01%
MSCI World Index
9.75%
16.76%
15.09%
11.23%
Lipper Global Large-Cap Growth Fund Classification
9.58%
13.97%
11.10%
10.60%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 64,385,465
Holdings Count | Holding 177
Advisory Fees Paid, Amount $ 144,088
InvestmentCompanyPortfolioTurnover 1.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$64,385,465
  • Number of Portfolio Holdings177
  • Portfolio Turnover Rate1%
  • Management Fees$144,088
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
98.7%
U.S. Government Obligations
1.1%
Other Assets and Liabilities (Net)
0.2%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Financial Services
13.3%
Food and Beverage
11.3%
Electronics
8.7%
Energy and Utilities
5.9%
Diversified Industrial
5.8%
Telecommunication Services
5.3%
Automotive
5.3%
Wireless Telecommunication Services
5.3%
Other Industry sectors
38.9%
Other Assets and Liabilities (Net)
0.2%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Sony Group Corp.
8.7%
Berkshire Hathaway Inc.
3.4%
CNH Industrial NV, New York
2.8%
Nestlé SA
2.2%
Rolls-Royce Holdings plc
2.1%
Iveco Group NV
2.0%
T-Mobile US Inc.
1.9%
Deutsche Telekom AG
1.8%
Mueller Industries Inc.
1.8%
Traton SE
1.8%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000002864  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Rising Income and Dividend Fund
Class Name Class C
Trading Symbol GACCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Rising Income and Dividend Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Rising Income and Dividend Fund - Class C
$48
0.90%
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli Global Rising Income & Dividend Fund (GRID) outperformed its broad-based benchmark, the MSCI World Index and its comparative, the Lipper Global Large-Cap Growth Fund Classification. Global stock markets were dominated by the ongoing tariff negotiations, but settled towards the end of the first half as some new deals were made at lower levels than had been anticipated. Interest rates remained unchanged in the first half. International markets saw modest gains, while the U.S. markets saw strong gains.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Rising Income and Dividend Fund - Class C
The Gabelli Global Rising Income and Dividend Fund - Class C (includes sales charge)
MSCI World Index
Lipper Global Large-Cap Growth Fund Classification
6/15
10,000
10,000
10,000
10,000
6/16
10,034
9,934
9,781
9,747
6/17
11,502
11,288
11,626
11,625
6/18
11,828
11,496
12,986
13,240
6/19
11,517
11,081
13,887
14,563
6/20
10,249
9,762
14,359
16,182
6/21
15,339
14,513
20,056
22,265
6/22
12,900
12,084
17,260
16,674
6/23
14,718
13,666
20,562
19,929
6/24
14,773
13,580
24,828
24,036
6/25
17,307
15,773
28,989
27,394
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Rising Income and Dividend Fund - Class C
12.96%
17.15%
11.05%
5.64%
The Gabelli Global Rising Income and Dividend Fund - Class C (includes sales charge)
11.96%
16.15%
11.05%
5.64%
MSCI World Index
9.75%
16.76%
15.09%
11.23%
Lipper Global Large-Cap Growth Fund Classification
9.58%
13.97%
11.10%
10.60%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 64,385,465
Holdings Count | Holding 177
Advisory Fees Paid, Amount $ 144,088
InvestmentCompanyPortfolioTurnover 1.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$64,385,465
  • Number of Portfolio Holdings177
  • Portfolio Turnover Rate1%
  • Management Fees$144,088
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
98.7%
U.S. Government Obligations
1.1%
Other Assets and Liabilities (Net)
0.2%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Financial Services
13.3%
Food and Beverage
11.3%
Electronics
8.7%
Energy and Utilities
5.9%
Diversified Industrial
5.8%
Telecommunication Services
5.3%
Automotive
5.3%
Wireless Telecommunication Services
5.3%
Other Industry sectors
38.9%
Other Assets and Liabilities (Net)
0.2%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Sony Group Corp.
8.7%
Berkshire Hathaway Inc.
3.4%
CNH Industrial NV, New York
2.8%
Nestlé SA
2.2%
Rolls-Royce Holdings plc
2.1%
Iveco Group NV
2.0%
T-Mobile US Inc.
1.9%
Deutsche Telekom AG
1.8%
Mueller Industries Inc.
1.8%
Traton SE
1.8%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000034308  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Rising Income and Dividend Fund
Class Name Class I
Trading Symbol GAGIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Rising Income and Dividend Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Rising Income and Dividend Fund - Class I
$48
0.90%
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli Global Rising Income & Dividend Fund (GRID) outperformed its broad-based benchmark, the MSCI World Index and its comparative, the Lipper Global Large-Cap Growth Fund Classification. Global stock markets were dominated by the ongoing tariff negotiations, but settled towards the end of the first half as some new deals were made at lower levels than had been anticipated. Interest rates remained unchanged in the first half. International markets saw modest gains, while the U.S. markets saw strong gains.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Rising Income and Dividend Fund - Class I
MSCI World Index
Lipper Global Large-Cap Growth Fund Classification
6/15
10,000
10,000
10,000
6/16
10,138
9,781
9,747
6/17
11,763
11,626
11,625
6/18
12,267
12,986
13,240
6/19
12,121
13,887
14,563
6/20
10,853
14,359
16,182
6/21
16,237
20,056
22,265
6/22
13,658
17,260
16,674
6/23
15,586
20,562
19,929
6/24
15,641
24,828
24,036
6/25
18,324
28,989
27,394
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Rising Income and Dividend Fund - Class I
12.98%
17.16%
11.04%
6.24%
MSCI World Index
9.75%
16.76%
15.09%
11.23%
Lipper Global Large-Cap Growth Fund Classification
9.58%
13.97%
11.10%
10.60%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 64,385,465
Holdings Count | Holding 177
Advisory Fees Paid, Amount $ 144,088
InvestmentCompanyPortfolioTurnover 1.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$64,385,465
  • Number of Portfolio Holdings177
  • Portfolio Turnover Rate1%
  • Management Fees$144,088
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
98.7%
U.S. Government Obligations
1.1%
Other Assets and Liabilities (Net)
0.2%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Financial Services
13.3%
Food and Beverage
11.3%
Electronics
8.7%
Energy and Utilities
5.9%
Diversified Industrial
5.8%
Telecommunication Services
5.3%
Automotive
5.3%
Wireless Telecommunication Services
5.3%
Other Industry sectors
38.9%
Other Assets and Liabilities (Net)
0.2%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Sony Group Corp.
8.7%
Berkshire Hathaway Inc.
3.4%
CNH Industrial NV, New York
2.8%
Nestlé SA
2.2%
Rolls-Royce Holdings plc
2.1%
Iveco Group NV
2.0%
T-Mobile US Inc.
1.9%
Deutsche Telekom AG
1.8%
Mueller Industries Inc.
1.8%
Traton SE
1.8%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000002862  
Shareholder Report [Line Items]  
Fund Name The Gabelli Global Rising Income and Dividend Fund
Class Name Class A
Trading Symbol GAGAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli Global Rising Income and Dividend Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli Global Rising Income and Dividend Fund - Class A
$48
0.90%
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli Global Rising Income & Dividend Fund (GRID) outperformed its broad-based benchmark, the MSCI World Index and its comparative, the Lipper Global Large-Cap Growth Fund Classification. Global stock markets were dominated by the ongoing tariff negotiations, but settled towards the end of the first half as some new deals were made at lower levels than had been anticipated. Interest rates remained unchanged in the first half. International markets saw modest gains, while the U.S. markets saw strong gains.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli Global Rising Income and Dividend Fund - Class A
The Gabelli Global Rising Income and Dividend Fund - Class A (includes sales charge)
MSCI World Index
Lipper Global Large-Cap Growth Fund Classification
6/15
10,000
10,000
10,000
10,000
6/16
10,110
9,528
9,781
9,747
6/17
11,674
10,369
11,626
11,625
6/18
12,097
10,127
12,986
13,240
6/19
11,867
9,363
13,887
14,563
6/20
10,596
7,880
14,359
16,182
6/21
15,853
11,111
20,056
22,265
6/22
13,335
8,809
17,260
16,674
6/23
15,215
9,473
20,562
19,929
6/24
15,269
8,960
24,828
24,036
6/25
17,888
9,893
28,989
27,394
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli Global Rising Income and Dividend Fund - Class A
12.97%
17.16%
11.04%
5.99%
The Gabelli Global Rising Income and Dividend Fund - Class A (includes sales charge)
6.48%
10.42%
9.73%
5.36%
MSCI World Index
9.75%
16.76%
15.09%
11.23%
Lipper Global Large-Cap Growth Fund Classification
9.58%
13.97%
11.10%
10.60%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 64,385,465
Holdings Count | Holding 177
Advisory Fees Paid, Amount $ 144,088
InvestmentCompanyPortfolioTurnover 1.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$64,385,465
  • Number of Portfolio Holdings177
  • Portfolio Turnover Rate1%
  • Management Fees$144,088
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
98.7%
U.S. Government Obligations
1.1%
Other Assets and Liabilities (Net)
0.2%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Financial Services
13.3%
Food and Beverage
11.3%
Electronics
8.7%
Energy and Utilities
5.9%
Diversified Industrial
5.8%
Telecommunication Services
5.3%
Automotive
5.3%
Wireless Telecommunication Services
5.3%
Other Industry sectors
38.9%
Other Assets and Liabilities (Net)
0.2%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Sony Group Corp.
8.7%
Berkshire Hathaway Inc.
3.4%
CNH Industrial NV, New York
2.8%
Nestlé SA
2.2%
Rolls-Royce Holdings plc
2.1%
Iveco Group NV
2.0%
T-Mobile US Inc.
1.9%
Deutsche Telekom AG
1.8%
Mueller Industries Inc.
1.8%
Traton SE
1.8%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000002873  
Shareholder Report [Line Items]  
Fund Name The Gabelli International Small Cap Fund
Class Name Class AAA
Trading Symbol GABOX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli International Small Cap Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli International Small Cap Fund - Class AAA
$51
0.92%
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.92%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli International Small Cap Fund outperformed its broad-based benchmark, the MSCI EAFE Index and its comparative, the MSCI EAFE Small Cap Index. Many factors, both overseas and domestically, drove first half performance. Uncertainty about tariffs was widespread and affected the majority of our trading partners. On a positive note, many European countries, including the United Kingdom and Germany, agreed to boost defence spending. In addition, gold equities saw strong performance as the price of bullion rose. The Fed has yet to lower interest rates in 2025.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli International Small Cap Fund - Class AAA
MSCI EAFE Index
MSCI EAFE Small Cap Index
6/15
10,000
10,000
10,000
6/16
10,139
9,028
9,668
6/17
11,468
10,909
11,954
6/18
12,309
11,712
13,490
6/19
11,279
11,900
12,684
6/20
11,603
11,337
12,280
6/21
16,115
15,069
17,374
6/22
11,178
12,458
13,267
6/23
12,571
14,876
14,688
6/24
12,139
16,674
15,907
6/25
14,410
19,731
19,580
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli International Small Cap Fund - Class AAA
22.30%
18.71%
4.43%
3.72%
MSCI EAFE Index
19.92%
18.33%
11.72%
7.03%
MSCI EAFE Small Cap Index
21.32%
23.09%
9.78%
6.95%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 5,981,268
Holdings Count | Holding 50
Advisory Fees Paid, Amount $ (67,146)
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$5,981,268
  • Number of Portfolio Holdings50
  • Portfolio Turnover Rate7%
  • Management Fees$(67,146)
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
95.4%
U.S. Government Obligations
4.1%
Preferred Stocks
2.4%
Other Assets and Liabilities (Net)
(1.9)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Materials
22.3%
Industrials
17.3%
Consumer Discretionary
14.5%
Consumer Staples
14.0%
Health Care
12.1%
Information Technology
9.9%
Financials
6.5%
U.S. Government Obligations
4.1%
Other Industry sectors
1.2%
Other Assets and Liabilities (Net)
(1.9)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Chemring Group plc
5.2%
Endeavour Mining plc
4.4%
Siegfried Holding AG
3.8%
Alamos Gold Inc.
3.3%
GMO internet group Inc.
3.1%
Genius Sports Ltd.
3.1%
Loomis AB
2.8%
Perseus Mining Ltd.
2.8%
Tamburi Investment Partners SpA
2.8%
Eldorado Gold Corp.
2.7%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000002871  
Shareholder Report [Line Items]  
Fund Name The Gabelli International Small Cap Fund
Class Name Class C
Trading Symbol GGLCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli International Small Cap Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli International Small Cap Fund - Class C
$51
0.92%
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.92%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli International Small Cap Fund outperformed its broad-based benchmark, the MSCI EAFE Index and its comparative, the MSCI EAFE Small Cap Index. Many factors, both overseas and domestically, drove first half performance. Uncertainty about tariffs was widespread and affected the majority of our trading partners. On a positive note, many European countries, including the United Kingdom and Germany, agreed to boost defence spending. In addition, gold equities saw strong performance as the price of bullion rose. The Fed has yet to lower interest rates in 2025.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli International Small Cap Fund - Class C
The Gabelli International Small Cap Fund - Class C (includes sales charge)
MSCI EAFE Index
MSCI EAFE Small Cap Index
6/15
10,000
10,000
10,000
10,000
6/16
10,068
9,968
9,028
9,668
6/17
11,351
11,138
10,909
11,954
6/18
11,994
11,658
11,712
13,490
6/19
10,799
10,391
11,900
12,684
6/20
11,027
10,507
11,337
12,280
6/21
15,312
14,485
15,069
17,374
6/22
10,629
9,955
12,458
13,267
6/23
11,948
11,090
14,876
14,688
6/24
11,542
10,607
16,674
15,907
6/25
13,695
12,479
19,731
19,580
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli International Small Cap Fund - Class C
22.32%
18.65%
4.43%
3.19%
The Gabelli International Small Cap Fund - Class C (includes sales charge)
21.32%
17.65%
4.43%
3.19%
MSCI EAFE Index
19.92%
18.33%
11.72%
7.03%
MSCI EAFE Small Cap Index
21.32%
23.09%
9.78%
6.95%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 5,981,268
Holdings Count | Holding 50
Advisory Fees Paid, Amount $ (67,146)
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$5,981,268
  • Number of Portfolio Holdings50
  • Portfolio Turnover Rate7%
  • Management Fees$(67,146)
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
95.4%
U.S. Government Obligations
4.1%
Preferred Stocks
2.4%
Other Assets and Liabilities (Net)
(1.9)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Materials
22.3%
Industrials
17.3%
Consumer Discretionary
14.5%
Consumer Staples
14.0%
Health Care
12.1%
Information Technology
9.9%
Financials
6.5%
U.S. Government Obligations
4.1%
Other Industry sectors
1.2%
Other Assets and Liabilities (Net)
(1.9)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Chemring Group plc
5.2%
Endeavour Mining plc
4.4%
Siegfried Holding AG
3.8%
Alamos Gold Inc.
3.3%
GMO internet group Inc.
3.1%
Genius Sports Ltd.
3.1%
Loomis AB
2.8%
Perseus Mining Ltd.
2.8%
Tamburi Investment Partners SpA
2.8%
Eldorado Gold Corp.
2.7%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000034310  
Shareholder Report [Line Items]  
Fund Name The Gabelli International Small Cap Fund
Class Name Class I
Trading Symbol GLOIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli International Small Cap Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli International Small Cap Fund - Class I
$51
0.92%
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.92%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli International Small Cap Fund outperformed its broad-based benchmark, the MSCI EAFE Index and its comparative, the MSCI EAFE Small Cap Index. Many factors, both overseas and domestically, drove first half performance. Uncertainty about tariffs was widespread and affected the majority of our trading partners. On a positive note, many European countries, including the United Kingdom and Germany, agreed to boost defence spending. In addition, gold equities saw strong performance as the price of bullion rose. The Fed has yet to lower interest rates in 2025.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli International Small Cap Fund - Class I
MSCI EAFE Index
MSCI EAFE Small Cap Index
6/15
10,000
10,000
10,000
6/16
9,720
9,028
9,668
6/17
10,216
10,909
11,954
6/18
10,078
11,712
13,490
6/19
10,293
11,900
12,684
6/20
9,948
11,337
12,280
6/21
13,888
15,069
17,374
6/22
9,998
12,458
13,267
6/23
10,534
14,876
14,688
6/24
12,954
16,674
15,907
6/25
16,880
19,731
19,580
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli International Small Cap Fund - Class I
22.39%
18.70%
4.44%
3.89%
MSCI EAFE Index
19.92%
18.33%
11.72%
7.03%
MSCI EAFE Small Cap Index
21.32%
23.09%
9.78%
6.95%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 5,981,268
Holdings Count | Holding 50
Advisory Fees Paid, Amount $ (67,146)
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$5,981,268
  • Number of Portfolio Holdings50
  • Portfolio Turnover Rate7%
  • Management Fees$(67,146)
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
95.4%
U.S. Government Obligations
4.1%
Preferred Stocks
2.4%
Other Assets and Liabilities (Net)
(1.9)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Materials
22.3%
Industrials
17.3%
Consumer Discretionary
14.5%
Consumer Staples
14.0%
Health Care
12.1%
Information Technology
9.9%
Financials
6.5%
U.S. Government Obligations
4.1%
Other Industry sectors
1.2%
Other Assets and Liabilities (Net)
(1.9)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Chemring Group plc
5.2%
Endeavour Mining plc
4.4%
Siegfried Holding AG
3.8%
Alamos Gold Inc.
3.3%
GMO internet group Inc.
3.1%
Genius Sports Ltd.
3.1%
Loomis AB
2.8%
Perseus Mining Ltd.
2.8%
Tamburi Investment Partners SpA
2.8%
Eldorado Gold Corp.
2.7%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
C000002872  
Shareholder Report [Line Items]  
Fund Name The Gabelli International Small Cap Fund
Class Name Class A
Trading Symbol GOCAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about The Gabelli International Small Cap Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/open_ends. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli International Small Cap Fund - Class A
$51
0.92%
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.92%
Factors Affecting Performance [Text Block]

How did the Fund perform?

For the six months ended June 30, 2025, The Gabelli International Small Cap Fund outperformed its broad-based benchmark, the MSCI EAFE Index and its comparative, the MSCI EAFE Small Cap Index. Many factors, both overseas and domestically, drove first half performance. Uncertainty about tariffs was widespread and affected the majority of our trading partners. On a positive note, many European countries, including the United Kingdom and Germany, agreed to boost defence spending. In addition, gold equities saw strong performance as the price of bullion rose. The Fed has yet to lower interest rates in 2025.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Growth of 10K Chart
The Gabelli International Small Cap Fund - Class A
The Gabelli International Small Cap Fund - Class A (includes sales charge)
MSCI EAFE Index
MSCI EAFE Small Cap Index
6/15
10,000
10,000
10,000
10,000
6/16
10,139
9,556
9,028
9,668
6/17
11,473
10,192
10,909
11,954
6/18
12,217
10,229
11,712
13,490
6/19
11,080
8,743
11,900
12,684
6/20
11,348
8,440
11,337
12,280
6/21
15,763
11,050
15,069
17,374
6/22
10,941
7,229
12,458
13,267
6/23
12,298
7,658
14,876
14,688
6/24
11,874
6,969
16,674
15,907
6/25
14,101
7,800
19,731
19,580
Average Annual Return [Table Text Block]
6 months
1 Year
5 Year
10 Year
The Gabelli International Small Cap Fund - Class A
22.36%
18.76%
4.44%
3.50%
The Gabelli International Small Cap Fund - Class A (includes sales charge)
15.32%
11.93%
3.21%
2.89%
MSCI EAFE Index
19.92%
18.33%
11.72%
7.03%
MSCI EAFE Small Cap Index
21.32%
23.09%
9.78%
6.95%
No Deduction of Taxes [Text Block] The table and graph presented above do not reflect the deduction of taxes a shareholder would pay on fund distributions or the redemption of fund shares.
AssetsNet $ 5,981,268
Holdings Count | Holding 50
Advisory Fees Paid, Amount $ (67,146)
InvestmentCompanyPortfolioTurnover 7.00%
Additional Fund Statistics [Text Block]

Fund Statistics

  • Total Net Assets$5,981,268
  • Number of Portfolio Holdings50
  • Portfolio Turnover Rate7%
  • Management Fees$(67,146)
Holdings [Text Block]

Portfolio Weighting (% of net assets)

Common Stocks
95.4%
U.S. Government Obligations
4.1%
Preferred Stocks
2.4%
Other Assets and Liabilities (Net)
(1.9)%

Industry Allocation (% of net assets)

Bar Graph showing Allocation by Industry
Industry Weighting
.
Materials
22.3%
Industrials
17.3%
Consumer Discretionary
14.5%
Consumer Staples
14.0%
Health Care
12.1%
Information Technology
9.9%
Financials
6.5%
U.S. Government Obligations
4.1%
Other Industry sectors
1.2%
Other Assets and Liabilities (Net)
(1.9)%
Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Chemring Group plc
5.2%
Endeavour Mining plc
4.4%
Siegfried Holding AG
3.8%
Alamos Gold Inc.
3.3%
GMO internet group Inc.
3.1%
Genius Sports Ltd.
3.1%
Loomis AB
2.8%
Perseus Mining Ltd.
2.8%
Tamburi Investment Partners SpA
2.8%
Eldorado Gold Corp.
2.7%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/open_ends</span>