Gabelli Global Growth Fund (GGGAX) N-CSR 10 Mar 25 Certified annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
	Dec. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
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	Dec. 31, 2024

Shareholder Report

Shareholder Report	12 Months Ended
	Dec. 31, 2024 USD ($) Holding
Shareholder Report [Line Items]
Document Type	N-CSR
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	Dec. 31, 2024
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 annual shareholder report contains important information about The Gabelli Global Growth Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B19">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $103 0.90%
Expenses Paid, Amount	$ 103
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? In 2024, The Gabelli Global Growth Fund outperformed its broad-based benchmark, the MSCI AC World Index and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classification. Economic data generally came in stronger than anticipated during the year, and the Federal Reserve saw enough progress in inflation to support 100bps of policy rate cuts starting in September. Separately, the artificial intelligence space continued to mature this year, and early winners have emerged in the semiconductor and data center infrastructure sectors. Against this backdrop, 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]	The Gabelli Global Growth Fund - Class AAA MSCI ACWI Index Lipper Global Large-Cap Growth Fund Classification 12/14 10,000 10,000 10,000 12/15 9,879 9,816 10,176 12/16 9,998 10,648 10,472 12/17 12,899 13,270 13,359 12/18 12,538 12,085 12,646 12/19 16,390 15,384 16,422 12/20 22,198 17,972 20,895 12/21 26,881 21,394 24,042 12/22 16,814 17,551 17,452 12/23 22,610 21,555 22,079 12/24 29,328 25,439 25,951
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Growth Fund - Class AAA 29.71% 12.34% 11.36% MSCI ACWI Index 18.02% 10.58% 9.79% Lipper Global Large-Cap Growth Fund Classification 17.54% 9.58% 10.00%
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	$ 190,324,373
Holdings Count | Holding	47
Advisory Fees Paid, Amount	$ 923,769
InvestmentCompanyPortfolioTurnover	26%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $190,324,373 Number of Portfolio Holdings 47 Portfolio Turnover Rate 26% Management Fees $923,769
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 99.2% U.S. Government Obligations 0.9% Other Assets and Liabilities (Net) (0.1)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) NVIDIA Corp. 7.5% Amazon.com Inc. 6.5% Meta Platforms Inc. 5.5% Microsoft Corp. 5.4% Netflix Inc. 5.4% Alphabet Inc. 5.0% Eli Lilly & Co. 3.8% Apple Inc. 3.2% Spotify Technology SA 3.2% Trane Technologies plc 3.1%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B37">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B38">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli Global Growth Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B48">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $103 0.90%
Expenses Paid, Amount	$ 103
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? In 2024, The Gabelli Global Growth Fund outperformed its broad-based benchmark, the MSCI AC World Index and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classification. Economic data generally came in stronger than anticipated during the year, and the Federal Reserve saw enough progress in inflation to support 100bps of policy rate cuts starting in September. Separately, the artificial intelligence space continued to mature this year, and early winners have emerged in the semiconductor and data center infrastructure sectors. Against this backdrop, 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]	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 12/14 10,000 10,000 10,000 10,000 12/15 9,806 9,708 9,816 10,176 12/16 9,848 9,653 10,648 10,472 12/17 12,610 12,263 13,270 13,359 12/18 12,168 11,716 12,085 12,646 12/19 15,797 15,092 15,384 16,422 12/20 21,390 20,286 17,972 20,895 12/21 25,900 24,359 21,394 24,042 12/22 16,200 15,085 17,551 17,452 12/23 21,783 20,133 21,555 22,079 12/24 28,257 25,915 25,439 25,951
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Growth Fund - Class C 29.72% 12.34% 10.95% The Gabelli Global Growth Fund - Class C (includes sales charge) 28.72% 12.34% 10.95% MSCI ACWI Index 18.02% 10.58% 9.79% Lipper Global Large-Cap Growth Fund Classification 17.54% 9.58% 10.00%
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	$ 190,324,373
Holdings Count | Holding	47
Advisory Fees Paid, Amount	$ 923,769
InvestmentCompanyPortfolioTurnover	26%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $190,324,373 Number of Portfolio Holdings 47 Portfolio Turnover Rate 26% Management Fees $923,769
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 99.2% U.S. Government Obligations 0.9% Other Assets and Liabilities (Net) (0.1)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) NVIDIA Corp. 7.5% Amazon.com Inc. 6.5% Meta Platforms Inc. 5.5% Microsoft Corp. 5.4% Netflix Inc. 5.4% Alphabet Inc. 5.0% Eli Lilly & Co. 3.8% Apple Inc. 3.2% Spotify Technology SA 3.2% Trane Technologies plc 3.1%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B66">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B67">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli Global Growth Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B77">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $103 0.90%
Expenses Paid, Amount	$ 103
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? In 2024, The Gabelli Global Growth Fund outperformed its broad-based benchmark, the MSCI AC World Index and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classification. Economic data generally came in stronger than anticipated during the year, and the Federal Reserve saw enough progress in inflation to support 100bps of policy rate cuts starting in September. Separately, the artificial intelligence space continued to mature this year, and early winners have emerged in the semiconductor and data center infrastructure sectors. Against this backdrop, 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]	The Gabelli Global Growth Fund - Class I MSCI ACWI Index Lipper Global Large-Cap Growth Fund Classification 12/14 10,000 10,000 10,000 12/15 9,947 9,816 10,176 12/16 10,141 10,648 10,472 12/17 13,167 13,270 13,359 12/18 12,855 12,085 12,646 12/19 16,844 15,384 16,422 12/20 22,805 17,972 20,895 12/21 27,617 21,394 24,042 12/22 17,280 17,551 17,452 12/23 23,238 21,555 22,079 12/24 30,142 25,439 25,951
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Growth Fund - Class I 29.71% 12.34% 11.66% MSCI ACWI Index 18.02% 10.58% 9.79% Lipper Global Large-Cap Growth Fund Classification 17.54% 9.58% 10.00%
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	$ 190,324,373
Holdings Count | Holding	47
Advisory Fees Paid, Amount	$ 923,769
InvestmentCompanyPortfolioTurnover	26%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $190,324,373 Number of Portfolio Holdings 47 Portfolio Turnover Rate 26% Management Fees $923,769
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 99.2% U.S. Government Obligations 0.9% Other Assets and Liabilities (Net) (0.1)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) NVIDIA Corp. 7.5% Amazon.com Inc. 6.5% Meta Platforms Inc. 5.5% Microsoft Corp. 5.4% Netflix Inc. 5.4% Alphabet Inc. 5.0% Eli Lilly & Co. 3.8% Apple Inc. 3.2% Spotify Technology SA 3.2% Trane Technologies plc 3.1%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B95">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B96">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli Global Growth Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B106">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $103 0.90%
Expenses Paid, Amount	$ 103
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? In 2024, The Gabelli Global Growth Fund outperformed its broad-based benchmark, the MSCI AC World Index and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classification. Economic data generally came in stronger than anticipated during the year, and the Federal Reserve saw enough progress in inflation to support 100bps of policy rate cuts starting in September. Separately, the artificial intelligence space continued to mature this year, and early winners have emerged in the semiconductor and data center infrastructure sectors. Against this backdrop, 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]	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 12/14 10,000 10,000 10,000 10,000 12/15 9,877 9,309 9,816 10,176 12/16 10,000 8,884 10,648 10,472 12/17 12,899 10,799 13,270 13,359 12/18 12,537 9,893 12,085 12,646 12/19 16,391 12,190 15,384 16,422 12/20 22,191 15,554 17,972 20,895 12/21 26,871 17,752 21,394 24,042 12/22 16,805 10,463 17,551 17,452 12/23 22,603 13,263 21,555 22,079 12/24 29,318 16,214 25,439 25,951
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Growth Fund - Class A 29.71% 12.33% 11.36% The Gabelli Global Growth Fund - Class A (includes sales charge) 22.25% 11.01% 10.70% MSCI ACWI Index 18.02% 10.58% 9.79% Lipper Global Large-Cap Growth Fund Classification 17.54% 9.58% 10.00%
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	$ 190,324,373
Holdings Count | Holding	47
Advisory Fees Paid, Amount	$ 923,769
InvestmentCompanyPortfolioTurnover	26%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $190,324,373 Number of Portfolio Holdings 47 Portfolio Turnover Rate 26% Management Fees $923,769
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 99.2% U.S. Government Obligations 0.9% Other Assets and Liabilities (Net) (0.1)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) NVIDIA Corp. 7.5% Amazon.com Inc. 6.5% Meta Platforms Inc. 5.5% Microsoft Corp. 5.4% Netflix Inc. 5.4% Alphabet Inc. 5.0% Eli Lilly & Co. 3.8% Apple Inc. 3.2% Spotify Technology SA 3.2% Trane Technologies plc 3.1%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B124">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B125">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
C000002875
Shareholder Report [Line Items]
Fund Name	The Gabelli Global Content &amp; Connectivity Fund
Class Name	Class AAA
Trading Symbol	GABTX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about The Gabelli Global Content &amp; Connectivity Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B135">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $100 0.90%
Expenses Paid, Amount	$ 100
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli Global Content & Connectivity Fund outperformed its broad-based benchmark, MSCI AC World Index but underperformed its comparative benchmark, MSCI AC World Communication Services Index. The difference in performance was largely driven by the Fund’s lower weights in technology- and online-related mega-cap stocks, to avoid excessive concentration. Top contributors to our Fund included firms benefiting from strength and scale in digital advertising, continued optimism around artificial intelligence platforms and rising demand for AI chips, solid wireless operating performance, or announced merger and acquisition transactions.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	The Gabelli Global Content & Connectivity Fund - Class AAA MSCI ACWI Index MSCI AC World Communication Services Index 12/14 10,000 10,000 10,000 12/15 9,752 9,816 9,860 12/16 10,010 10,648 10,437 12/17 11,350 13,270 11,335 12/18 10,000 12,085 10,191 12/19 11,562 15,384 12,750 12/20 13,461 17,972 15,823 12/21 14,157 21,394 17,535 12/22 10,105 17,551 11,340 12/23 12,418 21,555 15,664 12/24 15,221 25,439 20,669
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Content & Connectivity Fund - Class AAA 22.57% 5.65% 4.29% MSCI ACWI Index 18.02% 10.58% 9.79% MSCI AC World Communication Services Index 31.95% 10.14% 7.53%
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	$ 65,443,369
Holdings Count | Holding	48
Advisory Fees Paid, Amount	$ 137,060
InvestmentCompanyPortfolioTurnover	11%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $65,443,369 Number of Portfolio Holdings 48 Portfolio Turnover Rate 11% Management Fees $137,060
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 101.0% Preferred Stocks 0.2% Other Assets and Liabilities (Net) (1.2)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) T-Mobile US Inc. 9.1% Meta Platforms Inc. 8.5% Alphabet Inc. 7.8% SoftBank Group Corp. 6.6% Deutsche Telekom AG 5.0% Prosus NV 4.8% Telephone and Data Systems Inc. 3.9% Microsoft Corp. 3.9% United States Cellular Corp. 3.8% Frontier Communications Parent Inc. 3.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B153">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B154">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
C000002877
Shareholder Report [Line Items]
Fund Name	The Gabelli Global Content &amp; Connectivity Fund
Class Name	Class C
Trading Symbol	GTCCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about The Gabelli Global Content &amp; Connectivity Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B164">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $101 0.90%
Expenses Paid, Amount	$ 101
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli Global Content & Connectivity Fund outperformed its broad-based benchmark, MSCI AC World Index but underperformed its comparative benchmark, MSCI AC World Communication Services Index. The difference in performance was largely driven by the Fund’s lower weights in technology- and online-related mega-cap stocks, to avoid excessive concentration. Top contributors to our Fund included firms benefiting from strength and scale in digital advertising, continued optimism around artificial intelligence platforms and rising demand for AI chips, solid wireless operating performance, or announced merger and acquisition transactions.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	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 12/14 10,000 10,000 10,000 10,000 12/15 9,682 9,585 9,816 9,860 12/16 9,863 17,924 10,648 10,437 12/17 11,099 19,991 13,270 11,335 12/18 9,705 17,306 12,085 10,191 12/19 11,142 19,696 15,384 12,750 12/20 12,974 22,737 17,972 15,823 12/21 13,645 23,685 21,394 17,535 12/22 7,771 13,247 17,551 11,340 12/23 11,999 20,324 21,555 15,664 12/24 14,876 24,992 25,439 20,669
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Content & Connectivity Fund - Class C 22.57% 5.54% 3.85% The Gabelli Global Content & Connectivity Fund - Class C (includes sales charge) 21.57% 5.54% 3.85% MSCI ACWI Index 18.02% 10.58% 9.79% MSCI AC World Communication Services Index 31.95% 10.14% 7.53%
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	$ 65,443,369
Holdings Count | Holding	48
Advisory Fees Paid, Amount	$ 137,060
InvestmentCompanyPortfolioTurnover	11%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $65,443,369 Number of Portfolio Holdings 48 Portfolio Turnover Rate 11% Management Fees $137,060
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 101.0% Preferred Stocks 0.2% Other Assets and Liabilities (Net) (1.2)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) T-Mobile US Inc. 9.1% Meta Platforms Inc. 8.5% Alphabet Inc. 7.8% SoftBank Group Corp. 6.6% Deutsche Telekom AG 5.0% Prosus NV 4.8% Telephone and Data Systems Inc. 3.9% Microsoft Corp. 3.9% United States Cellular Corp. 3.8% Frontier Communications Parent Inc. 3.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B182">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B183">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
C000034311
Shareholder Report [Line Items]
Fund Name	The Gabelli Global Content &amp; Connectivity Fund
Class Name	Class I
Trading Symbol	GTTIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about The Gabelli Global Content &amp; Connectivity Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B193">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $100 0.90%
Expenses Paid, Amount	$ 100
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli Global Content & Connectivity Fund outperformed its broad-based benchmark, MSCI AC World Index but underperformed its comparative benchmark, MSCI AC World Communication Services Index. The difference in performance was largely driven by the Fund’s lower weights in technology- and online-related mega-cap stocks, to avoid excessive concentration. Top contributors to our Fund included firms benefiting from strength and scale in digital advertising, continued optimism around artificial intelligence platforms and rising demand for AI chips, solid wireless operating performance, or announced merger and acquisition transactions.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	The Gabelli Global Content & Connectivity Fund - Class I MSCI ACWI Index MSCI AC World Communication Services Index 12/14 10,000 10,000 10,000 12/15 9,778 9,816 9,860 12/16 10,066 10,648 10,437 12/17 11,496 13,270 11,335 12/18 10,200 12,085 10,191 12/19 11,875 15,384 12,750 12/20 13,825 17,972 15,823 12/21 14,541 21,394 17,535 12/22 10,380 17,551 11,340 12/23 12,756 21,555 15,664 12/24 15,637 25,439 20,669
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Content & Connectivity Fund - Class I 22.58% 5.66% 4.57% MSCI ACWI Index 18.02% 10.58% 9.79% MSCI AC World Communication Services Index 31.95% 10.14% 7.53%
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	$ 65,443,369
Holdings Count | Holding	48
Advisory Fees Paid, Amount	$ 137,060
InvestmentCompanyPortfolioTurnover	11%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $65,443,369 Number of Portfolio Holdings 48 Portfolio Turnover Rate 11% Management Fees $137,060
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 101.0% Preferred Stocks 0.2% Other Assets and Liabilities (Net) (1.2)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) T-Mobile US Inc. 9.1% Meta Platforms Inc. 8.5% Alphabet Inc. 7.8% SoftBank Group Corp. 6.6% Deutsche Telekom AG 5.0% Prosus NV 4.8% Telephone and Data Systems Inc. 3.9% Microsoft Corp. 3.9% United States Cellular Corp. 3.8% Frontier Communications Parent Inc. 3.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B211">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B212">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
C000002874
Shareholder Report [Line Items]
Fund Name	The Gabelli Global Content &amp; Connectivity Fund
Class Name	Class A
Trading Symbol	GTCAX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about The Gabelli Global Content &amp; Connectivity Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B222">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $100 0.90%
Expenses Paid, Amount	$ 100
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli Global Content & Connectivity Fund outperformed its broad-based benchmark, MSCI AC World Index but underperformed its comparative benchmark, MSCI AC World Communication Services Index. The difference in performance was largely driven by the Fund’s lower weights in technology- and online-related mega-cap stocks, to avoid excessive concentration. Top contributors to our Fund included firms benefiting from strength and scale in digital advertising, continued optimism around artificial intelligence platforms and rising demand for AI chips, solid wireless operating performance, or announced merger and acquisition transactions.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	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 12/14 10,000 10,000 10,000 10,000 12/15 9,754 9,194 9,816 9,860 12/16 9,999 8,883 10,648 10,437 12/17 11,338 9,494 13,270 11,335 12/18 9,984 7,880 12,085 10,191 12/19 11,545 8,588 15,384 12,750 12/20 13,442 9,424 17,972 15,823 12/21 14,136 9,342 21,394 17,535 12/22 10,090 6,285 17,551 11,340 12/23 12,403 7,281 21,555 15,664 12/24 15,200 8,410 25,439 20,669
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Content & Connectivity Fund - Class A 22.55% 5.66% 4.28% The Gabelli Global Content & Connectivity Fund - Class A (includes sales charge) 15.51% 4.41% 3.66% MSCI ACWI Index 18.02% 10.58% 9.79% MSCI AC World Communication Services Index 31.95% 10.14% 7.53%
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	$ 65,443,369
Holdings Count | Holding	48
Advisory Fees Paid, Amount	$ 137,060
InvestmentCompanyPortfolioTurnover	11%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $65,443,369 Number of Portfolio Holdings 48 Portfolio Turnover Rate 11% Management Fees $137,060
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 101.0% Preferred Stocks 0.2% Other Assets and Liabilities (Net) (1.2)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) T-Mobile US Inc. 9.1% Meta Platforms Inc. 8.5% Alphabet Inc. 7.8% SoftBank Group Corp. 6.6% Deutsche Telekom AG 5.0% Prosus NV 4.8% Telephone and Data Systems Inc. 3.9% Microsoft Corp. 3.9% United States Cellular Corp. 3.8% Frontier Communications Parent Inc. 3.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B240">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B241">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli Global Mini Mites Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B251">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $95 0.90%
Expenses Paid, Amount	$ 95
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, the Gabelli Global Mini Mites Fund underperformed its broad-based benchmark, the Russell 2000 Index, while outperforming its comparative benchmarks, the MSCI World Micro-Cap and the S&P Developed Small Cap Indices. The year's second half performance accelerated in anticipation of a more favorable environment under a Trump administration. The new administration may fuel increased deal activity, higher domestic economic activity, and increased expectations of lower interest rates. The fund seeks to invest in companies that have market capitalizations of $250 million or less which are sensitive to these macro indicators.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	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 12/18 8,628 8,132 8,899 8,157 8,620 12/19 9,618 8,543 11,170 9,844 10,873 12/20 11,133 9,330 13,400 12,120 12,635 12/21 13,291 10,498 15,385 14,080 14,553 12/22 11,142 8,295 12,241 10,938 11,888 12/23 15,479 10,861 14,313 11,718 13,778 12/24 17,164 11,040 15,965 12,436 14,969
Average Annual Return [Table Text Block]	1 Year 5 Year Since Inception (10/1/2018) The Gabelli Global Mini Mites Fund - Class A 10.98% 12.30% 9.04% The Gabelli Global Mini Mites Fund - Class A (includes sales charge) 4.60% 10.98% 8.01% Russell 2000 Index 11.54% 7.40% 6.15% MSCI World Micro Cap Index 6.13% 4.88% 3.67% S&P Developed Small Cap Index 8.64% 6.60% 5.97%
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	$ 12,664,636
Holdings Count | Holding	143
Advisory Fees Paid, Amount	$ (54,045)
InvestmentCompanyPortfolioTurnover	26%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $12,664,636 Number of Portfolio Holdings 143 Portfolio Turnover Rate 26% Management Fees $(54,045)
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 84.2% U.S. Government Obligations 14.6% Other Assets and Liabilities (Net) 1.2%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Tredegar Corp. 7.0% Applied Optoelectronics Inc. 4.4% L.B. Foster Co. 2.6% Park-Ohio Holdings Corp. 2.4% Electromed Inc. 2.1% Ampco-Pittsburgh Corp. 2.0% Lee Enterprises Inc. 2.0% Clarus Corp. 2.0% Inspired Entertainment Inc. 1.8% Velan Inc. 1.8%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B269">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B270">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli Global Mini Mites Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B280">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $95 0.90%
Expenses Paid, Amount	$ 95
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, the Gabelli Global Mini Mites Fund underperformed its broad-based benchmark, the Russell 2000 Index, while outperforming its comparative benchmarks, the MSCI World Micro-Cap and the S&P Developed Small Cap Indices. The year's second half performance accelerated in anticipation of a more favorable environment under a Trump administration. The new administration may fuel increased deal activity, higher domestic economic activity, and increased expectations of lower interest rates. The fund seeks to invest in companies that have market capitalizations of $250 million or less which are sensitive to these macro indicators.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	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 12/18 8,612 8,538 8,899 8,157 8,620 12/19 9,545 9,377 11,170 9,844 10,873 12/20 11,054 10,766 13,400 12,120 12,635 12/21 13,191 12,741 15,385 14,080 14,553 12/22 11,048 10,564 12,241 10,938 11,888 12/23 15,363 14,585 14,313 11,718 13,778 12/24 17,035 15,242 15,965 12,436 14,969
Average Annual Return [Table Text Block]	1 Year 5 Year Since Inception (10/1/2018) The Gabelli Global Mini Mites Fund - Class C 10.89% 12.29% 8.90% The Gabelli Global Mini Mites Fund - Class C (includes sales charge) 9.89% 12.29% 8.90% Russell 2000 Index 11.54% 7.40% 6.15% MSCI World Micro Cap Index 6.13% 4.88% 3.67% S&P Developed Small Cap Index 8.64% 6.60% 5.97%
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	$ 12,664,636
Holdings Count | Holding	143
Advisory Fees Paid, Amount	$ (54,045)
InvestmentCompanyPortfolioTurnover	26%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $12,664,636 Number of Portfolio Holdings 143 Portfolio Turnover Rate 26% Management Fees $(54,045)
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 84.2% U.S. Government Obligations 14.6% Other Assets and Liabilities (Net) 1.2%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Tredegar Corp. 7.0% Applied Optoelectronics Inc. 4.4% L.B. Foster Co. 2.6% Park-Ohio Holdings Corp. 2.4% Electromed Inc. 2.1% Ampco-Pittsburgh Corp. 2.0% Lee Enterprises Inc. 2.0% Clarus Corp. 2.0% Inspired Entertainment Inc. 1.8% Velan Inc. 1.8%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B298">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B299">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli Global Mini Mites Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B309">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $95 0.90%
Expenses Paid, Amount	$ 95
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, the Gabelli Global Mini Mites Fund underperformed its broad-based benchmark, the Russell 2000 Index, while outperforming its comparative benchmarks, the MSCI World Micro-Cap and the S&P Developed Small Cap Indices. The year's second half performance accelerated in anticipation of a more favorable environment under a Trump administration. The new administration may fuel increased deal activity, higher domestic economic activity, and increased expectations of lower interest rates. The fund seeks to invest in companies that have market capitalizations of $250 million or less which are sensitive to these macro indicators.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	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 12/18 8,624 8,899 8,157 8,620 12/19 9,645 11,170 9,844 10,873 12/20 11,176 13,400 12,120 12,635 12/21 13,327 15,385 14,080 14,553 12/22 11,172 12,241 10,938 11,888 12/23 15,535 14,313 11,718 13,778 12/24 17,225 15,965 12,436 14,969
Average Annual Return [Table Text Block]	1 Year 5 Year Since Inception (10/1/2018) The Gabelli Global Mini Mites Fund - Class I 10.88% 12.30% 9.09% Russell 2000 Index 11.54% 7.40% 6.15% MSCI World Micro Cap Index 6.13% 4.88% 3.67% S&P Developed Small Cap Index 8.64% 6.60% 5.97%
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	$ 12,664,636
Holdings Count | Holding	143
Advisory Fees Paid, Amount	$ (54,045)
InvestmentCompanyPortfolioTurnover	26%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $12,664,636 Number of Portfolio Holdings 143 Portfolio Turnover Rate 26% Management Fees $(54,045)
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 84.2% U.S. Government Obligations 14.6% Other Assets and Liabilities (Net) 1.2%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Tredegar Corp. 7.0% Applied Optoelectronics Inc. 4.4% L.B. Foster Co. 2.6% Park-Ohio Holdings Corp. 2.4% Electromed Inc. 2.1% Ampco-Pittsburgh Corp. 2.0% Lee Enterprises Inc. 2.0% Clarus Corp. 2.0% Inspired Entertainment Inc. 1.8% Velan Inc. 1.8%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B327">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B328">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli Global Mini Mites Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B338">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $95 0.90%
Expenses Paid, Amount	$ 95
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, the Gabelli Global Mini Mites Fund underperformed its broad-based benchmark, the Russell 2000 Index, while outperforming its comparative benchmarks, the MSCI World Micro-Cap and the S&P Developed Small Cap Indices. The year's second half performance accelerated in anticipation of a more favorable environment under a Trump administration. The new administration may fuel increased deal activity, higher domestic economic activity, and increased expectations of lower interest rates. The fund seeks to invest in companies that have market capitalizations of $250 million or less which are sensitive to these macro indicators.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	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 12/18 8,629 8,899 8,157 8,620 12/19 9,620 11,170 9,844 10,873 12/20 11,147 13,400 12,120 12,635 12/21 13,293 15,385 14,080 14,553 12/22 11,144 12,241 10,938 11,888 12/23 15,495 14,313 11,718 13,778 12/24 17,181 15,965 12,436 14,969
Average Annual Return [Table Text Block]	1 Year 5 Year Since Inception (10/1/2018) The Gabelli Global Mini Mites Fund - Class AAA 10.88% 12.30% 9.05% Russell 2000 Index 11.54% 7.40% 6.15% MSCI World Micro Cap Index 6.13% 4.88% 3.67% S&P Developed Small Cap Index 8.64% 6.60% 5.97%
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	$ 12,664,636
Holdings Count | Holding	143
Advisory Fees Paid, Amount	$ (54,045)
InvestmentCompanyPortfolioTurnover	26%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $12,664,636 Number of Portfolio Holdings 143 Portfolio Turnover Rate 26% Management Fees $(54,045)
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 84.2% U.S. Government Obligations 14.6% Other Assets and Liabilities (Net) 1.2%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Tredegar Corp. 7.0% Applied Optoelectronics Inc. 4.4% L.B. Foster Co. 2.6% Park-Ohio Holdings Corp. 2.4% Electromed Inc. 2.1% Ampco-Pittsburgh Corp. 2.0% Lee Enterprises Inc. 2.0% Clarus Corp. 2.0% Inspired Entertainment Inc. 1.8% Velan Inc. 1.8%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B356">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B357">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli Global Rising Income and Dividend Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B367">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $91 0.90%
Expenses Paid, Amount	$ 91
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli Global Rising Income & Dividend Fund underperformed its broad-based benchmark, the MSCI World Index, and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classification. In 2024, US inflation improved substantially, running around 3%, close to the Federal Reserve’s long term target rate of 2% annually. Also in 2024, the Fed lowered short-term interest rates by 100 basis points and rates now stand at 4.5%. Although geopolitical risks in the Ukraine and the Middle East have remained high all year, inflation rates are generally coming down across the globe as supply chains get back to normal.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	The Gabelli Global Rising Income and Dividend Fund - Class AAA MSCI World Index Lipper Global Large-Cap Growth Fund Classification 12/14 10,000 10,000 10,000 12/15 10,059 9,968 10,176 12/16 10,603 10,780 10,472 12/17 12,820 13,267 13,359 12/18 11,023 12,179 12,646 12/19 12,608 15,638 16,422 12/20 14,081 18,219 20,895 12/21 17,083 22,291 24,042 12/22 14,413 18,339 17,452 12/23 15,842 22,817 22,079 12/24 16,170 27,195 25,951
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Rising Income and Dividend Fund - Class AAA 2.07% 5.10% 4.92% MSCI World Index 19.19% 11.70% 10.52% Lipper Global Large-Cap Growth Fund Classification 17.54% 9.58% 10.00%
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	$ 64,704,417
Holdings Count | Holding	183
Advisory Fees Paid, Amount	$ 305,937
InvestmentCompanyPortfolioTurnover	7%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $64,704,417 Number of Portfolio Holdings 183 Portfolio Turnover Rate 7% Management Fees $305,937
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 87.2% U.S. Government Obligations 12.8% Other Assets and Liabilities (Net ) Footnote Reference * (0.0)% Footnote Description Footnote * Amount represents greater than (0.05)%.
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Sony Group Corp. 7.2% Berkshire Hathaway Inc. 3.2% CNH Industrial NV, New York 2.4% Herc Holdings Inc. 2.1% Nestlé SA 1.8% Mueller Industries Inc. 1.8% T-Mobile US Inc. 1.8% Traton SE 1.6% Deutsche Telekom AG 1.5% Enpro Inc. 1.4%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B385">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B386">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli Global Rising Income and Dividend Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B396">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $91 0.90%
Expenses Paid, Amount	$ 91
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli Global Rising Income & Dividend Fund underperformed its broad-based benchmark, the MSCI World Index, and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classification. In 2024, US inflation improved substantially, running around 3%, close to the Federal Reserve’s long term target rate of 2% annually. Also in 2024, the Fed lowered short-term interest rates by 100 basis points and rates now stand at 4.5%. Although geopolitical risks in the Ukraine and the Middle East have remained high all year, inflation rates are generally coming down across the globe as supply chains get back to normal.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	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 12/14 10,000 10,000 10,000 10,000 12/15 9,963 9,863 9,968 10,176 12/16 10,422 10,219 10,780 10,472 12/17 12,505 12,519 13,267 13,359 12/18 10,673 10,273 12,179 12,646 12/19 12,125 11,568 15,638 16,422 12/20 13,538 12,800 18,219 20,895 12/21 16,424 15,401 22,291 24,042 12/22 13,864 12,869 18,339 17,452 12/23 15,235 14,013 22,817 22,079 12/24 15,549 14,162 27,195 25,951
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Rising Income and Dividend Fund - Class C 2.06% 5.10% 4.51% The Gabelli Global Rising Income and Dividend Fund - Class C (includes sales charge) 1.06% 5.10% 4.51% MSCI World Index 19.19% 11.70% 10.52% Lipper Global Large-Cap Growth Fund Classification 17.54% 9.58% 10.00%
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	$ 64,704,417
Holdings Count | Holding	183
Advisory Fees Paid, Amount	$ 305,937
InvestmentCompanyPortfolioTurnover	7%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $64,704,417 Number of Portfolio Holdings 183 Portfolio Turnover Rate 7% Management Fees $305,937
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 87.2% U.S. Government Obligations 12.8% Other Assets and Liabilities (Net ) Footnote Reference * (0.0)% Footnote Description Footnote * Amount represents greater than (0.05)%.
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Sony Group Corp. 7.2% Berkshire Hathaway Inc. 3.2% CNH Industrial NV, New York 2.4% Herc Holdings Inc. 2.1% Nestlé SA 1.8% Mueller Industries Inc. 1.8% T-Mobile US Inc. 1.8% Traton SE 1.6% Deutsche Telekom AG 1.5% Enpro Inc. 1.4%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B414">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B415">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli Global Rising Income and Dividend Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B425">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $91 0.90%
Expenses Paid, Amount	$ 91
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli Global Rising Income & Dividend Fund underperformed its broad-based benchmark, the MSCI World Index, and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classification. In 2024, US inflation improved substantially, running around 3%, close to the Federal Reserve’s long term target rate of 2% annually. Also in 2024, the Fed lowered short-term interest rates by 100 basis points and rates now stand at 4.5%. Although geopolitical risks in the Ukraine and the Middle East have remained high all year, inflation rates are generally coming down across the globe as supply chains get back to normal.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	The Gabelli Global Rising Income and Dividend Fund - Class I MSCI World Index Lipper Global Large-Cap Growth Fund Classification 12/14 10,000 10,000 10,000 12/15 10,060 9,968 10,176 12/16 10,639 10,780 10,472 12/17 12,946 13,267 13,359 12/18 11,206 12,179 12,646 12/19 12,899 15,638 16,422 12/20 14,405 18,219 20,895 12/21 17,479 22,291 24,042 12/22 14,750 18,339 17,452 12/23 16,212 22,817 22,079 12/24 16,541 27,195 25,951
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Rising Income and Dividend Fund - Class I 2.03% 5.10% 5.16% MSCI World Index 19.19% 11.70% 10.52% Lipper Global Large-Cap Growth Fund Classification 17.54% 9.58% 10.00%
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	$ 64,704,417
Holdings Count | Holding	183
Advisory Fees Paid, Amount	$ 305,937
InvestmentCompanyPortfolioTurnover	7%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $64,704,417 Number of Portfolio Holdings 183 Portfolio Turnover Rate 7% Management Fees $305,937
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 87.2% U.S. Government Obligations 12.8% Other Assets and Liabilities (Net ) Footnote Reference * (0.0)% Footnote Description Footnote * Amount represents greater than (0.05)%.
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Sony Group Corp. 7.2% Berkshire Hathaway Inc. 3.2% CNH Industrial NV, New York 2.4% Herc Holdings Inc. 2.1% Nestlé SA 1.8% Mueller Industries Inc. 1.8% T-Mobile US Inc. 1.8% Traton SE 1.6% Deutsche Telekom AG 1.5% Enpro Inc. 1.4%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B443">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B444">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli Global Rising Income and Dividend Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B454">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $91 0.90%
Expenses Paid, Amount	$ 91
Expense Ratio, Percent	0.90%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli Global Rising Income & Dividend Fund underperformed its broad-based benchmark, the MSCI World Index, and its comparative benchmark, the Lipper Global Large-Cap Growth Fund Classification. In 2024, US inflation improved substantially, running around 3%, close to the Federal Reserve’s long term target rate of 2% annually. Also in 2024, the Fed lowered short-term interest rates by 100 basis points and rates now stand at 4.5%. Although geopolitical risks in the Ukraine and the Middle East have remained high all year, inflation rates are generally coming down across the globe as supply chains get back to normal.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	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 12/14 10,000 10,000 10,000 10,000 12/15 10,041 9,463 9,968 10,176 12/16 10,581 9,399 10,780 10,472 12/17 12,796 10,713 13,267 13,359 12/18 11,003 8,681 12,179 12,646 12/19 12,582 9,356 15,638 16,422 12/20 14,053 9,849 18,219 20,895 12/21 17,048 11,260 22,291 24,042 12/22 14,385 8,955 18,339 17,452 12/23 15,809 9,276 22,817 22,079 12/24 16,135 8,923 27,195 25,951
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli Global Rising Income and Dividend Fund - Class A 2.06% 5.10% 4.90% The Gabelli Global Rising Income and Dividend Fund - Class A (includes sales charge) (3.81)% 3.86% 4.28% MSCI World Index 19.19% 11.70% 10.52% Lipper Global Large-Cap Growth Fund Classification 17.54% 9.58% 10.00%
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	$ 64,704,417
Holdings Count | Holding	183
Advisory Fees Paid, Amount	$ 305,937
InvestmentCompanyPortfolioTurnover	7%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $64,704,417 Number of Portfolio Holdings 183 Portfolio Turnover Rate 7% Management Fees $305,937
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 87.2% U.S. Government Obligations 12.8% Other Assets and Liabilities (Net ) Footnote Reference * (0.0)% Footnote Description Footnote * Amount represents greater than (0.05)%.
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Sony Group Corp. 7.2% Berkshire Hathaway Inc. 3.2% CNH Industrial NV, New York 2.4% Herc Holdings Inc. 2.1% Nestlé SA 1.8% Mueller Industries Inc. 1.8% T-Mobile US Inc. 1.8% Traton SE 1.6% Deutsche Telekom AG 1.5% Enpro Inc. 1.4%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B472">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B473">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli International Small Cap Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B483">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $89 0.92%
Expenses Paid, Amount	$ 89
Expense Ratio, Percent	0.92%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli International Small Cap Fund underperformed its broad-based benchmark, MSCI EAFE Index and its comparative, MSCI EAFE Small Cap Index. International markets have lagged the US for an extended period, by so much that the valuation discount is at a record level. Much of this can be explained by the tremendous earnings growth displayed by a small group of large capitalization US-based technology companies. Also, small capitalization equities as an asset class have been out of favor in most markets. Finally, returns from international investments were negatively impacted by the continued strength of the US dollar.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	The Gabelli International Small Cap Fund - Class AAA MSCI EAFE Index MSCI EAFE Small Cap Index 12/14 10,000 10,000 10,000 12/15 10,019 9,961 11,423 12/16 10,131 10,111 11,288 12/17 12,977 12,702 15,378 12/18 10,269 11,005 12,701 12/19 12,932 13,499 16,259 12/20 15,410 14,616 19,965 12/21 16,051 16,338 21,682 12/22 11,958 14,049 15,743 12/23 12,714 16,697 17,524 12/24 11,946 17,424 17,748
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli International Small Cap Fund - Class AAA (6.04)% (1.57)% 1.79% MSCI EAFE Index 4.35% 5.24% 5.71% MSCI EAFE Small Cap Index 2.32% 2.74% 5.95%
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	$ 5,208,987
Holdings Count | Holding	51
Advisory Fees Paid, Amount	$ (135,783)
InvestmentCompanyPortfolioTurnover	4%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $5,208,987 Number of Portfolio Holdings 51 Portfolio Turnover Rate 4% Management Fees $(135,783)
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 96.7% U.S. Government Obligations 3.3% Preferred Stocks 1.7% Other Assets and Liabilities (Net) (1.7)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Siegfried Holding AG 4.2% Chemring Group plc 3.6% Endeavour Mining plc 3.3% Laurent-Perrier 3.3% Tamburi Investment Partners SpA 3.0% Genius Sports Ltd. 3.0% Alamos Gold Inc. 3.0% Westgold Resources Ltd. 2.7% Gerresheimer AG 2.5% Interparfums SA 2.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B501">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B502">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli International Small Cap Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B512">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $89 0.92%
Expenses Paid, Amount	$ 89
Expense Ratio, Percent	0.92%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli International Small Cap Fund underperformed its broad-based benchmark, MSCI EAFE Index and its comparative, MSCI EAFE Small Cap Index. International markets have lagged the US for an extended period, by so much that the valuation discount is at a record level. Much of this can be explained by the tremendous earnings growth displayed by a small group of large capitalization US-based technology companies. Also, small capitalization equities as an asset class have been out of favor in most markets. Finally, returns from international investments were negatively impacted by the continued strength of the US dollar.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	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 12/14 10,000 10,000 10,000 10,000 12/15 9,940 9,840 9,961 11,423 12/16 10,024 9,825 10,111 11,288 12/17 12,710 12,359 12,702 15,378 12/18 9,872 9,503 11,005 12,701 12/19 12,242 11,690 13,499 16,259 12/20 14,591 13,816 14,616 19,965 12/21 15,204 14,258 16,338 21,682 12/22 11,320 10,510 14,049 15,743 12/23 12,043 11,076 16,697 17,524 12/24 11,307 10,295 17,424 17,748
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli International Small Cap Fund - Class C (6.11)% (1.58)% 1.24% The Gabelli International Small Cap Fund - Class C (includes sales charge) (7.05)% (1.58)% 1.24% MSCI EAFE Index 4.35% 5.24% 5.71% MSCI EAFE Small Cap Index 2.32% 2.74% 5.95%
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	$ 5,208,987
Holdings Count | Holding	51
Advisory Fees Paid, Amount	$ (135,783)
InvestmentCompanyPortfolioTurnover	4%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $5,208,987 Number of Portfolio Holdings 51 Portfolio Turnover Rate 4% Management Fees $(135,783)
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 96.7% U.S. Government Obligations 3.3% Preferred Stocks 1.7% Other Assets and Liabilities (Net) (1.7)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Siegfried Holding AG 4.2% Chemring Group plc 3.6% Endeavour Mining plc 3.3% Laurent-Perrier 3.3% Tamburi Investment Partners SpA 3.0% Genius Sports Ltd. 3.0% Alamos Gold Inc. 3.0% Westgold Resources Ltd. 2.7% Gerresheimer AG 2.5% Interparfums SA 2.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B530">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B531">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli International Small Cap Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B541">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $89 0.92%
Expenses Paid, Amount	$ 89
Expense Ratio, Percent	0.92%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli International Small Cap Fund underperformed its broad-based benchmark, MSCI EAFE Index and its comparative, MSCI EAFE Small Cap Index. International markets have lagged the US for an extended period, by so much that the valuation discount is at a record level. Much of this can be explained by the tremendous earnings growth displayed by a small group of large capitalization US-based technology companies. Also, small capitalization equities as an asset class have been out of favor in most markets. Finally, returns from international investments were negatively impacted by the continued strength of the US dollar.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	The Gabelli International Small Cap Fund - Class I MSCI EAFE Index MSCI EAFE Small Cap Index 12/14 10,000 10,000 10,000 12/15 10,120 9,961 11,423 12/16 10,269 10,111 11,288 12/17 13,249 12,702 15,378 12/18 10,480 11,005 12,701 12/19 13,209 13,499 16,259 12/20 15,733 14,616 19,965 12/21 16,391 16,338 21,682 12/22 12,199 14,049 15,743 12/23 12,981 16,697 17,524 12/24 12,188 17,424 17,748
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli International Small Cap Fund - Class I (6.11)% (1.60)% 2.00% MSCI EAFE Index 4.35% 5.24% 5.71% MSCI EAFE Small Cap Index 2.32% 2.74% 5.95%
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	$ 5,208,987
Holdings Count | Holding	51
Advisory Fees Paid, Amount	$ (135,783)
InvestmentCompanyPortfolioTurnover	4%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $5,208,987 Number of Portfolio Holdings 51 Portfolio Turnover Rate 4% Management Fees $(135,783)
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 96.7% U.S. Government Obligations 3.3% Preferred Stocks 1.7% Other Assets and Liabilities (Net) (1.7)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Siegfried Holding AG 4.2% Chemring Group plc 3.6% Endeavour Mining plc 3.3% Laurent-Perrier 3.3% Tamburi Investment Partners SpA 3.0% Genius Sports Ltd. 3.0% Alamos Gold Inc. 3.0% Westgold Resources Ltd. 2.7% Gerresheimer AG 2.5% Interparfums SA 2.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B559">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B560">&lt;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;">www.gabelli.com/funds/open_ends&lt;/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 annual shareholder report contains important information about The Gabelli International Small Cap Fund (the Fund) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You may find additional information about the Fund at www.gabelli.com/funds/open_ends
Additional Information Phone Number	800-GABELLI (800-422-3554)
Additional Information Website	www.gabelli.com/funds/open_ends</span>" id="sjs-B570">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year? (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 $89 0.92%
Expenses Paid, Amount	$ 89
Expense Ratio, Percent	0.92%
Factors Affecting Performance [Text Block]	How did the Fund perform? For the fiscal year ended December 31, 2024, The Gabelli International Small Cap Fund underperformed its broad-based benchmark, MSCI EAFE Index and its comparative, MSCI EAFE Small Cap Index. International markets have lagged the US for an extended period, by so much that the valuation discount is at a record level. Much of this can be explained by the tremendous earnings growth displayed by a small group of large capitalization US-based technology companies. Also, small capitalization equities as an asset class have been out of favor in most markets. Finally, returns from international investments were negatively impacted by the continued strength of the US dollar.
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future results.
Line Graph [Table Text Block]	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 12/14 10,000 10,000 10,000 10,000 12/15 10,011 9,435 9,961 11,423 12/16 10,124 8,992 10,111 11,288 12/17 12,933 10,826 12,702 15,378 12/18 10,126 7,990 11,005 12,701 12/19 12,644 9,402 13,499 16,259 12/20 15,062 10,557 14,616 19,965 12/21 15,701 10,371 16,338 21,682 12/22 11,689 7,277 14,049 15,743 12/23 12,430 7,293 16,697 17,524 12/24 11,678 6,458 17,424 17,748
Average Annual Return [Table Text Block]	1 Year 5 Year 10 Year The Gabelli International Small Cap Fund - Class A (6.05)% (1.58)% 1.56% The Gabelli International Small Cap Fund - Class A (includes sales charge) (11.45)% (2.74)% 0.96% MSCI EAFE Index 4.35% 5.24% 5.71% MSCI EAFE Small Cap Index 2.32% 2.74% 5.95%
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	$ 5,208,987
Holdings Count | Holding	51
Advisory Fees Paid, Amount	$ (135,783)
InvestmentCompanyPortfolioTurnover	4%
Additional Fund Statistics [Text Block]	Fund Statistics Total Net Assets $5,208,987 Number of Portfolio Holdings 51 Portfolio Turnover Rate 4% Management Fees $(135,783)
Holdings [Text Block]	Portfolio Weighting (% of net assets) Common Stocks 96.7% U.S. Government Obligations 3.3% Preferred Stocks 1.7% Other Assets and Liabilities (Net) (1.7)%
Largest Holdings [Text Block]	Top 10 Holdings (% of net assets) Siegfried Holding AG 4.2% Chemring Group plc 3.6% Endeavour Mining plc 3.3% Laurent-Perrier 3.3% Tamburi Investment Partners SpA 3.0% Genius Sports Ltd. 3.0% Alamos Gold Inc. 3.0% Westgold Resources Ltd. 2.7% Gerresheimer AG 2.5% Interparfums SA 2.5%
Material Fund Change [Text Block]
Updated Prospectus Phone Number	800-GABELLI (800-422-3554)
Updated Prospectus Email Address	info@gabelli.com</span>" id="sjs-B588">&lt;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;">info@gabelli.com&lt;/span>
Updated Prospectus Web Address	www.gabelli.com/funds/open_ends</span>" id="sjs-B589">&lt;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;">www.gabelli.com/funds/open_ends&lt;/span>

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)		12 Months Ended
	Oct. 01, 2018	Dec. 31, 2014	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
C000002867
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Growth Fund - Class AAA
C000002869
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Growth Fund - Class C
C000034309
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Growth Fund - Class I
C000002866
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Growth Fund - Class A
C000002875
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Content & Connectivity Fund - Class AAA
C000002877
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Content & Connectivity Fund - Class C
C000034311
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Content & Connectivity Fund - Class I
C000002874
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Content & Connectivity Fund - Class A
C000204772
Account Value [Line Items]
Line Graph and Table Measure Name	The Gabelli Global Mini Mites Fund - Class A
C000204774
Account Value [Line Items]
Line Graph and Table Measure Name	The Gabelli Global Mini Mites Fund - Class C
C000204771
Account Value [Line Items]
Line Graph and Table Measure Name	The Gabelli Global Mini Mites Fund - Class I
C000204773
Account Value [Line Items]
Line Graph and Table Measure Name	The Gabelli Global Mini Mites Fund - Class AAA
C000002865
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Rising Income and Dividend Fund - Class AAA
C000002864
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Rising Income and Dividend Fund - Class C
C000034308
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Rising Income and Dividend Fund - Class I
C000002862
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli Global Rising Income and Dividend Fund - Class A
C000002873
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli International Small Cap Fund - Class AAA
C000002871
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli International Small Cap Fund - Class C
C000034310
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli International Small Cap Fund - Class I
C000002872
Account Value [Line Items]
Line Graph and Table Measure Name		The Gabelli International Small Cap Fund - Class A
MSCI ACWI Index
Account Value [Line Items]
Account Value		$ 10,000	$ 25,439	$ 21,555	$ 17,551	$ 21,394	$ 17,972	$ 15,384	$ 12,085	$ 13,270	$ 10,648	$ 9,816
MSCI ACWI Index
Account Value [Line Items]
Account Value		10,000	25,439	21,555	17,551	21,394	17,972	15,384	12,085	13,270	10,648	9,816
MSCI ACWI Index
Account Value [Line Items]
Account Value		10,000	25,439	21,555	17,551	21,394	17,972	15,384	12,085	13,270	10,648	9,816
MSCI ACWI Index
Account Value [Line Items]
Account Value		10,000	25,439	21,555	17,551	21,394	17,972	15,384	12,085	13,270	10,648	9,816
MSCI ACWI Index
Account Value [Line Items]
Account Value		10,000	25,439	21,555	17,551	21,394	17,972	15,384	12,085	13,270	10,648	9,816
MSCI ACWI Index
Account Value [Line Items]
Account Value		10,000	25,439	21,555	17,551	21,394	17,972	15,384	12,085	13,270	10,648	9,816
MSCI ACWI Index
Account Value [Line Items]
Account Value		10,000	25,439	21,555	17,551	21,394	17,972	15,384	12,085	13,270	10,648	9,816
MSCI ACWI Index
Account Value [Line Items]
Account Value		10,000	25,439	21,555	17,551	21,394	17,972	15,384	12,085	13,270	10,648	9,816
Russell 2000 Index
Account Value [Line Items]
Account Value	$ 10,000		15,965	14,313	12,241	15,385	13,400	11,170	8,899
Russell 2000 Index
Account Value [Line Items]
Account Value	10,000		15,965	14,313	12,241	15,385	13,400	11,170	8,899
Russell 2000 Index
Account Value [Line Items]
Account Value	10,000		15,965	14,313	12,241	15,385	13,400	11,170	8,899
Russell 2000 Index
Account Value [Line Items]
Account Value	10,000		15,965	14,313	12,241	15,385	13,400	11,170	8,899
MSCI World Index
Account Value [Line Items]
Account Value		10,000	27,195	22,817	18,339	22,291	18,219	15,638	12,179	13,267	10,780	9,968
MSCI World Index
Account Value [Line Items]
Account Value		10,000	27,195	22,817	18,339	22,291	18,219	15,638	12,179	13,267	10,780	9,968
MSCI World Index
Account Value [Line Items]
Account Value		10,000	27,195	22,817	18,339	22,291	18,219	15,638	12,179	13,267	10,780	9,968
MSCI World Index
Account Value [Line Items]
Account Value		10,000	27,195	22,817	18,339	22,291	18,219	15,638	12,179	13,267	10,780	9,968
MSCI EAFE Index
Account Value [Line Items]
Account Value		10,000	17,424	16,697	14,049	16,338	14,616	13,499	11,005	12,702	10,111	9,961
MSCI EAFE Index
Account Value [Line Items]
Account Value		10,000	17,424	16,697	14,049	16,338	14,616	13,499	11,005	12,702	10,111	9,961
MSCI EAFE Index
Account Value [Line Items]
Account Value		10,000	17,424	16,697	14,049	16,338	14,616	13,499	11,005	12,702	10,111	9,961
MSCI EAFE Index
Account Value [Line Items]
Account Value		10,000	17,424	16,697	14,049	16,338	14,616	13,499	11,005	12,702	10,111	9,961
Lipper Global Large-Cap Growth Fund Classification
Account Value [Line Items]
Account Value		10,000	25,951	22,079	17,452	24,042	20,895	16,422	12,646	13,359	10,472	10,176
Lipper Global Large-Cap Growth Fund Classification
Account Value [Line Items]
Account Value		10,000	25,951	22,079	17,452	24,042	20,895	16,422	12,646	13,359	10,472	10,176
Lipper Global Large-Cap Growth Fund Classification
Account Value [Line Items]
Account Value		10,000	25,951	22,079	17,452	24,042	20,895	16,422	12,646	13,359	10,472	10,176
Lipper Global Large-Cap Growth Fund Classification
Account Value [Line Items]
Account Value		10,000	25,951	22,079	17,452	24,042	20,895	16,422	12,646	13,359	10,472	10,176
MSCI AC World Communication Services Index
Account Value [Line Items]
Account Value		10,000	20,669	15,664	11,340	17,535	15,823	12,750	10,191	11,335	10,437	9,860
MSCI AC World Communication Services Index
Account Value [Line Items]
Account Value		10,000	20,669	15,664	11,340	17,535	15,823	12,750	10,191	11,335	10,437	9,860
MSCI AC World Communication Services Index
Account Value [Line Items]
Account Value		10,000	20,669	15,664	11,340	17,535	15,823	12,750	10,191	11,335	10,437	9,860
MSCI AC World Communication Services Index
Account Value [Line Items]
Account Value		10,000	20,669	15,664	11,340	17,535	15,823	12,750	10,191	11,335	10,437	9,860
MSCI World Micro Cap Index
Account Value [Line Items]
Account Value	10,000		12,436	11,718	10,938	14,080	12,120	9,844	8,157
S&P Developed Small Cap Index
Account Value [Line Items]
Account Value	10,000		14,969	13,778	11,888	14,553	12,635	10,873	8,620
MSCI World Micro Cap Index
Account Value [Line Items]
Account Value	10,000		12,436	11,718	10,938	14,080	12,120	9,844	8,157
S&P Developed Small Cap Index
Account Value [Line Items]
Account Value	10,000		14,969	13,778	11,888	14,553	12,635	10,873	8,620
MSCI World Micro Cap Index
Account Value [Line Items]
Account Value	10,000		12,436	11,718	10,938	14,080	12,120	9,844	8,157
S&P Developed Small Cap Index
Account Value [Line Items]
Account Value	10,000		14,969	13,778	11,888	14,553	12,635	10,873	8,620
MSCI World Micro Cap Index
Account Value [Line Items]
Account Value	10,000		12,436	11,718	10,938	14,080	12,120	9,844	8,157
S&P Developed Small Cap Index
Account Value [Line Items]
Account Value	$ 10,000		14,969	13,778	11,888	14,553	12,635	10,873	8,620
Lipper Global Large-Cap Growth Fund Classification
Account Value [Line Items]
Account Value		10,000	25,951	22,079	17,452	24,042	20,895	16,422	12,646	13,359	10,472	10,176
Lipper Global Large-Cap Growth Fund Classification
Account Value [Line Items]
Account Value		10,000	25,951	22,079	17,452	24,042	20,895	16,422	12,646	13,359	10,472	10,176
Lipper Global Large-Cap Growth Fund Classification
Account Value [Line Items]
Account Value		10,000	25,951	22,079	17,452	24,042	20,895	16,422	12,646	13,359	10,472	10,176
Lipper Global Large-Cap Growth Fund Classification
Account Value [Line Items]
Account Value		10,000	25,951	22,079	17,452	24,042	20,895	16,422	12,646	13,359	10,472	10,176
MSCI EAFE Small Cap Index
Account Value [Line Items]
Account Value		10,000	17,748	17,524	15,743	21,682	19,965	16,259	12,701	15,378	11,288	11,423
MSCI EAFE Small Cap Index
Account Value [Line Items]
Account Value		10,000	17,748	17,524	15,743	21,682	19,965	16,259	12,701	15,378	11,288	11,423
MSCI EAFE Small Cap Index
Account Value [Line Items]
Account Value		10,000	17,748	17,524	15,743	21,682	19,965	16,259	12,701	15,378	11,288	11,423
MSCI EAFE Small Cap Index
Account Value [Line Items]
Account Value		$ 10,000	$ 17,748	$ 17,524	$ 15,743	$ 21,682	$ 19,965	$ 16,259	$ 12,701	$ 15,378	$ 11,288	$ 11,423

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)		12 Months Ended		60 Months Ended	75 Months Ended	120 Months Ended
	Oct. 01, 2018	Dec. 31, 2024	Dec. 31, 2014	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2024
C000002867
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Growth Fund - Class AAA
C000002869
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Growth Fund - Class C
Average Annual Return, Percent		28.72%		12.34%		10.95%
C000034309
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Growth Fund - Class I
C000002866
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Growth Fund - Class A
Average Annual Return, Percent		22.25%		11.01%		10.70%
C000002875
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Content & Connectivity Fund - Class AAA
C000002877
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Content & Connectivity Fund - Class C
Average Annual Return, Percent		21.57%		5.54%		3.85%
C000034311
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Content & Connectivity Fund - Class I
C000002874
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Content & Connectivity Fund - Class A
Average Annual Return, Percent		15.51%		4.41%		3.66%
C000204772
Average Annual Return [Line Items]
Line Graph and Table Measure Name	The Gabelli Global Mini Mites Fund - Class A
Average Annual Return, Percent		4.60%		10.98%	8.01%
C000204774
Average Annual Return [Line Items]
Line Graph and Table Measure Name	The Gabelli Global Mini Mites Fund - Class C
Average Annual Return, Percent		9.89%		12.29%	8.90%
C000204771
Average Annual Return [Line Items]
Line Graph and Table Measure Name	The Gabelli Global Mini Mites Fund - Class I
C000204773
Average Annual Return [Line Items]
Line Graph and Table Measure Name	The Gabelli Global Mini Mites Fund - Class AAA
C000002865
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Rising Income and Dividend Fund - Class AAA
C000002864
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Rising Income and Dividend Fund - Class C
Average Annual Return, Percent		1.06%		5.10%		4.51%
C000034308
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Rising Income and Dividend Fund - Class I
C000002862
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli Global Rising Income and Dividend Fund - Class A
Average Annual Return, Percent		(3.81%)		3.86%		4.28%
C000002873
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli International Small Cap Fund - Class AAA
C000002871
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli International Small Cap Fund - Class C
Average Annual Return, Percent		(7.05%)		(1.58%)		1.24%
C000034310
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli International Small Cap Fund - Class I
C000002872
Average Annual Return [Line Items]
Line Graph and Table Measure Name			The Gabelli International Small Cap Fund - Class A
Average Annual Return, Percent		(11.45%)		(2.74%)		0.96%
Without Sales Load [Member] | C000002867
Average Annual Return [Line Items]
Average Annual Return, Percent		29.71%		12.34%		11.36%
Without Sales Load [Member] | C000002869
Average Annual Return [Line Items]
Average Annual Return, Percent		29.72%		12.34%		10.95%
Without Sales Load [Member] | C000034309
Average Annual Return [Line Items]
Average Annual Return, Percent		29.71%		12.34%		11.66%
Without Sales Load [Member] | C000002866
Average Annual Return [Line Items]
Average Annual Return, Percent		29.71%		12.33%		11.36%
Without Sales Load [Member] | C000002875
Average Annual Return [Line Items]
Average Annual Return, Percent		22.57%		5.65%		4.29%
Without Sales Load [Member] | C000002877
Average Annual Return [Line Items]
Average Annual Return, Percent		22.57%		5.54%		3.85%
Without Sales Load [Member] | C000034311
Average Annual Return [Line Items]
Average Annual Return, Percent		22.58%		5.66%		4.57%
Without Sales Load [Member] | C000002874
Average Annual Return [Line Items]
Average Annual Return, Percent		22.55%		5.66%		4.28%
Without Sales Load [Member] | C000204772
Average Annual Return [Line Items]
Average Annual Return, Percent		10.98%		12.30%	9.04%
Without Sales Load [Member] | C000204774
Average Annual Return [Line Items]
Average Annual Return, Percent		10.89%		12.29%	8.90%
Without Sales Load [Member] | C000204771
Average Annual Return [Line Items]
Average Annual Return, Percent		10.88%		12.30%	9.09%
Without Sales Load [Member] | C000204773
Average Annual Return [Line Items]
Average Annual Return, Percent		10.88%		12.30%	9.05%
Without Sales Load [Member] | C000002865
Average Annual Return [Line Items]
Average Annual Return, Percent		2.07%		5.10%		4.92%
Without Sales Load [Member] | C000002864
Average Annual Return [Line Items]
Average Annual Return, Percent		2.06%		5.10%		4.51%
Without Sales Load [Member] | C000034308
Average Annual Return [Line Items]
Average Annual Return, Percent		2.03%		5.10%		5.16%
Without Sales Load [Member] | C000002862
Average Annual Return [Line Items]
Average Annual Return, Percent		2.06%		5.10%		4.90%
Without Sales Load [Member] | C000002873
Average Annual Return [Line Items]
Average Annual Return, Percent		(6.04%)		(1.57%)		1.79%
Without Sales Load [Member] | C000002871
Average Annual Return [Line Items]
Average Annual Return, Percent		(6.11%)		(1.58%)		1.24%
Without Sales Load [Member] | C000034310
Average Annual Return [Line Items]
Average Annual Return, Percent		(6.11%)		(1.60%)		2%
Without Sales Load [Member] | C000002872
Average Annual Return [Line Items]
Average Annual Return, Percent		(6.05%)		(1.58%)		1.56%
MSCI ACWI Index
Average Annual Return [Line Items]
Average Annual Return, Percent		18.02%		10.58%		9.79%
MSCI ACWI Index
Average Annual Return [Line Items]
Average Annual Return, Percent		18.02%		10.58%		9.79%
MSCI ACWI Index
Average Annual Return [Line Items]
Average Annual Return, Percent		18.02%		10.58%		9.79%
MSCI ACWI Index
Average Annual Return [Line Items]
Average Annual Return, Percent		18.02%		10.58%		9.79%
MSCI ACWI Index
Average Annual Return [Line Items]
Average Annual Return, Percent		18.02%		10.58%		9.79%
MSCI ACWI Index
Average Annual Return [Line Items]
Average Annual Return, Percent		18.02%		10.58%		9.79%
MSCI ACWI Index
Average Annual Return [Line Items]
Average Annual Return, Percent		18.02%		10.58%		9.79%
MSCI ACWI Index
Average Annual Return [Line Items]
Average Annual Return, Percent		18.02%		10.58%		9.79%
Russell 2000 Index
Average Annual Return [Line Items]
Average Annual Return, Percent		11.54%		7.40%	6.15%
Russell 2000 Index
Average Annual Return [Line Items]
Average Annual Return, Percent		11.54%		7.40%	6.15%
Russell 2000 Index
Average Annual Return [Line Items]
Average Annual Return, Percent		11.54%		7.40%	6.15%
Russell 2000 Index
Average Annual Return [Line Items]
Average Annual Return, Percent		11.54%		7.40%	6.15%
MSCI World Index
Average Annual Return [Line Items]
Average Annual Return, Percent		19.19%		11.70%		10.52%
MSCI World Index
Average Annual Return [Line Items]
Average Annual Return, Percent		19.19%		11.70%		10.52%
MSCI World Index
Average Annual Return [Line Items]
Average Annual Return, Percent		19.19%		11.70%		10.52%
MSCI World Index
Average Annual Return [Line Items]
Average Annual Return, Percent		19.19%		11.70%		10.52%
MSCI EAFE Index
Average Annual Return [Line Items]
Average Annual Return, Percent		4.35%		5.24%		5.71%
MSCI EAFE Index
Average Annual Return [Line Items]
Average Annual Return, Percent		4.35%		5.24%		5.71%
MSCI EAFE Index
Average Annual Return [Line Items]
Average Annual Return, Percent		4.35%		5.24%		5.71%
MSCI EAFE Index
Average Annual Return [Line Items]
Average Annual Return, Percent		4.35%		5.24%		5.71%
Lipper Global Large-Cap Growth Fund Classification
Average Annual Return [Line Items]
Average Annual Return, Percent		17.54%		9.58%		10%
Lipper Global Large-Cap Growth Fund Classification
Average Annual Return [Line Items]
Average Annual Return, Percent		17.54%		9.58%		10%
Lipper Global Large-Cap Growth Fund Classification
Average Annual Return [Line Items]
Average Annual Return, Percent		17.54%		9.58%		10%
Lipper Global Large-Cap Growth Fund Classification
Average Annual Return [Line Items]
Average Annual Return, Percent		17.54%		9.58%		10%
MSCI AC World Communication Services Index
Average Annual Return [Line Items]
Average Annual Return, Percent		31.95%		10.14%		7.53%
MSCI AC World Communication Services Index
Average Annual Return [Line Items]
Average Annual Return, Percent		31.95%		10.14%		7.53%
MSCI AC World Communication Services Index
Average Annual Return [Line Items]
Average Annual Return, Percent		31.95%		10.14%		7.53%
MSCI AC World Communication Services Index
Average Annual Return [Line Items]
Average Annual Return, Percent		31.95%		10.14%		7.53%
MSCI World Micro Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		6.13%		4.88%	3.67%
S&P Developed Small Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		8.64%		6.60%	5.97%
MSCI World Micro Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		6.13%		4.88%	3.67%
S&P Developed Small Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		8.64%		6.60%	5.97%
MSCI World Micro Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		6.13%		4.88%	3.67%
S&P Developed Small Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		8.64%		6.60%	5.97%
MSCI World Micro Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		6.13%		4.88%	3.67%
S&P Developed Small Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		8.64%		6.60%	5.97%
Lipper Global Large-Cap Growth Fund Classification
Average Annual Return [Line Items]
Average Annual Return, Percent		17.54%		9.58%		10%
Lipper Global Large-Cap Growth Fund Classification
Average Annual Return [Line Items]
Average Annual Return, Percent		17.54%		9.58%		10%
Lipper Global Large-Cap Growth Fund Classification
Average Annual Return [Line Items]
Average Annual Return, Percent		17.54%		9.58%		10%
Lipper Global Large-Cap Growth Fund Classification
Average Annual Return [Line Items]
Average Annual Return, Percent		17.54%		9.58%		10%
MSCI EAFE Small Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		2.32%		2.74%		5.95%
MSCI EAFE Small Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		2.32%		2.74%		5.95%
MSCI EAFE Small Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		2.32%		2.74%		5.95%
MSCI EAFE Small Cap Index
Average Annual Return [Line Items]
Average Annual Return, Percent		2.32%		2.74%		5.95%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Dec. 31, 2024
C000002867 | NVIDIA Corp.
Holdings [Line Items]
Percent of Net Asset Value	7.50%
C000002867 | Amazon.com Inc.
Holdings [Line Items]
Percent of Net Asset Value	6.50%
C000002867 | Meta Platforms Inc.
Holdings [Line Items]
Percent of Net Asset Value	5.50%
C000002867 | Microsoft Corp.
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000002867 | Netflix Inc.
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000002867 | Alphabet Inc.
Holdings [Line Items]
Percent of Net Asset Value	5%
C000002867 | Eli Lilly & Co.
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000002867 | Apple Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000002867 | Spotify Technology SA
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000002867 | Trane Technologies plc
Holdings [Line Items]
Percent of Net Asset Value	3.10%
C000002867 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	99.20%
C000002867 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	0.90%
C000002867 | Information Technology - Semiconductors, Hardware, and Equipment
Holdings [Line Items]
Percent of Net Asset Value	19.40%
C000002867 | Communication Services
Holdings [Line Items]
Percent of Net Asset Value	19.10%
C000002867 | Financials
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000002867 | Information Technology - Software and Services
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000002867 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000002867 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	11.80%
C000002867 | Industrials
Holdings [Line Items]
Percent of Net Asset Value	8%
C000002867 | Consumer Staples
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000002867 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002867 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(0.10%)
C000002869 | NVIDIA Corp.
Holdings [Line Items]
Percent of Net Asset Value	7.50%
C000002869 | Amazon.com Inc.
Holdings [Line Items]
Percent of Net Asset Value	6.50%
C000002869 | Meta Platforms Inc.
Holdings [Line Items]
Percent of Net Asset Value	5.50%
C000002869 | Microsoft Corp.
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000002869 | Netflix Inc.
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000002869 | Alphabet Inc.
Holdings [Line Items]
Percent of Net Asset Value	5%
C000002869 | Eli Lilly & Co.
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000002869 | Apple Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000002869 | Spotify Technology SA
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000002869 | Trane Technologies plc
Holdings [Line Items]
Percent of Net Asset Value	3.10%
C000002869 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	99.20%
C000002869 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	0.90%
C000002869 | Information Technology - Semiconductors, Hardware, and Equipment
Holdings [Line Items]
Percent of Net Asset Value	19.40%
C000002869 | Communication Services
Holdings [Line Items]
Percent of Net Asset Value	19.10%
C000002869 | Financials
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000002869 | Information Technology - Software and Services
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000002869 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000002869 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	11.80%
C000002869 | Industrials
Holdings [Line Items]
Percent of Net Asset Value	8%
C000002869 | Consumer Staples
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000002869 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002869 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(0.10%)
C000034309 | NVIDIA Corp.
Holdings [Line Items]
Percent of Net Asset Value	7.50%
C000034309 | Amazon.com Inc.
Holdings [Line Items]
Percent of Net Asset Value	6.50%
C000034309 | Meta Platforms Inc.
Holdings [Line Items]
Percent of Net Asset Value	5.50%
C000034309 | Microsoft Corp.
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000034309 | Netflix Inc.
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000034309 | Alphabet Inc.
Holdings [Line Items]
Percent of Net Asset Value	5%
C000034309 | Eli Lilly & Co.
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000034309 | Apple Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000034309 | Spotify Technology SA
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000034309 | Trane Technologies plc
Holdings [Line Items]
Percent of Net Asset Value	3.10%
C000034309 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	99.20%
C000034309 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	0.90%
C000034309 | Information Technology - Semiconductors, Hardware, and Equipment
Holdings [Line Items]
Percent of Net Asset Value	19.40%
C000034309 | Communication Services
Holdings [Line Items]
Percent of Net Asset Value	19.10%
C000034309 | Financials
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000034309 | Information Technology - Software and Services
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000034309 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000034309 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	11.80%
C000034309 | Industrials
Holdings [Line Items]
Percent of Net Asset Value	8%
C000034309 | Consumer Staples
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000034309 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000034309 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(0.10%)
C000002866 | NVIDIA Corp.
Holdings [Line Items]
Percent of Net Asset Value	7.50%
C000002866 | Amazon.com Inc.
Holdings [Line Items]
Percent of Net Asset Value	6.50%
C000002866 | Meta Platforms Inc.
Holdings [Line Items]
Percent of Net Asset Value	5.50%
C000002866 | Microsoft Corp.
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000002866 | Netflix Inc.
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000002866 | Alphabet Inc.
Holdings [Line Items]
Percent of Net Asset Value	5%
C000002866 | Eli Lilly & Co.
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000002866 | Apple Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000002866 | Spotify Technology SA
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000002866 | Trane Technologies plc
Holdings [Line Items]
Percent of Net Asset Value	3.10%
C000002866 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	99.20%
C000002866 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	0.90%
C000002866 | Information Technology - Semiconductors, Hardware, and Equipment
Holdings [Line Items]
Percent of Net Asset Value	19.40%
C000002866 | Communication Services
Holdings [Line Items]
Percent of Net Asset Value	19.10%
C000002866 | Financials
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000002866 | Information Technology - Software and Services
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000002866 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000002866 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	11.80%
C000002866 | Industrials
Holdings [Line Items]
Percent of Net Asset Value	8%
C000002866 | Consumer Staples
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000002866 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002866 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(0.10%)
C000002875 | Meta Platforms Inc.
Holdings [Line Items]
Percent of Net Asset Value	8.50%
C000002875 | Microsoft Corp.
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000002875 | Alphabet Inc.
Holdings [Line Items]
Percent of Net Asset Value	7.80%
C000002875 | T-Mobile US Inc.
Holdings [Line Items]
Percent of Net Asset Value	9.10%
C000002875 | SoftBank Group Corp.
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000002875 | Deutsche Telekom AG
Holdings [Line Items]
Percent of Net Asset Value	5%
C000002875 | Prosus NV
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000002875 | Telephone and Data Systems Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000002875 | United States Cellular Corp.
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000002875 | Frontier Communications Parent Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000002875 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	101%
C000002875 | InvestmentType_Preferred Stocks
Holdings [Line Items]
Percent of Net Asset Value	0.20%
C000002875 | Communication Services
Holdings [Line Items]
Percent of Net Asset Value	76%
C000002875 | Financials
Holdings [Line Items]
Percent of Net Asset Value	5.90%
C000002875 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	9.50%
C000002875 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(1.20%)
C000002875 | Information Technology
Holdings [Line Items]
Percent of Net Asset Value	6%
C000002875 | Real Estate
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000002877 | Meta Platforms Inc.
Holdings [Line Items]
Percent of Net Asset Value	8.50%
C000002877 | Microsoft Corp.
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000002877 | Alphabet Inc.
Holdings [Line Items]
Percent of Net Asset Value	7.80%
C000002877 | T-Mobile US Inc.
Holdings [Line Items]
Percent of Net Asset Value	9.10%
C000002877 | SoftBank Group Corp.
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000002877 | Deutsche Telekom AG
Holdings [Line Items]
Percent of Net Asset Value	5%
C000002877 | Prosus NV
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000002877 | Telephone and Data Systems Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000002877 | United States Cellular Corp.
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000002877 | Frontier Communications Parent Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000002877 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	101%
C000002877 | InvestmentType_Preferred Stocks
Holdings [Line Items]
Percent of Net Asset Value	0.20%
C000002877 | Communication Services
Holdings [Line Items]
Percent of Net Asset Value	76%
C000002877 | Financials
Holdings [Line Items]
Percent of Net Asset Value	5.90%
C000002877 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	9.50%
C000002877 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(1.20%)
C000002877 | Information Technology
Holdings [Line Items]
Percent of Net Asset Value	6%
C000002877 | Real Estate
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000034311 | Meta Platforms Inc.
Holdings [Line Items]
Percent of Net Asset Value	8.50%
C000034311 | Microsoft Corp.
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000034311 | Alphabet Inc.
Holdings [Line Items]
Percent of Net Asset Value	7.80%
C000034311 | T-Mobile US Inc.
Holdings [Line Items]
Percent of Net Asset Value	9.10%
C000034311 | SoftBank Group Corp.
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000034311 | Deutsche Telekom AG
Holdings [Line Items]
Percent of Net Asset Value	5%
C000034311 | Prosus NV
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000034311 | Telephone and Data Systems Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000034311 | United States Cellular Corp.
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000034311 | Frontier Communications Parent Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000034311 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	101%
C000034311 | InvestmentType_Preferred Stocks
Holdings [Line Items]
Percent of Net Asset Value	0.20%
C000034311 | Communication Services
Holdings [Line Items]
Percent of Net Asset Value	76%
C000034311 | Financials
Holdings [Line Items]
Percent of Net Asset Value	5.90%
C000034311 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	9.50%
C000034311 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(1.20%)
C000034311 | Information Technology
Holdings [Line Items]
Percent of Net Asset Value	6%
C000034311 | Real Estate
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000002874 | Meta Platforms Inc.
Holdings [Line Items]
Percent of Net Asset Value	8.50%
C000002874 | Microsoft Corp.
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000002874 | Alphabet Inc.
Holdings [Line Items]
Percent of Net Asset Value	7.80%
C000002874 | T-Mobile US Inc.
Holdings [Line Items]
Percent of Net Asset Value	9.10%
C000002874 | SoftBank Group Corp.
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000002874 | Deutsche Telekom AG
Holdings [Line Items]
Percent of Net Asset Value	5%
C000002874 | Prosus NV
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000002874 | Telephone and Data Systems Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000002874 | United States Cellular Corp.
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000002874 | Frontier Communications Parent Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000002874 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	101%
C000002874 | InvestmentType_Preferred Stocks
Holdings [Line Items]
Percent of Net Asset Value	0.20%
C000002874 | Communication Services
Holdings [Line Items]
Percent of Net Asset Value	76%
C000002874 | Financials
Holdings [Line Items]
Percent of Net Asset Value	5.90%
C000002874 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	9.50%
C000002874 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(1.20%)
C000002874 | Information Technology
Holdings [Line Items]
Percent of Net Asset Value	6%
C000002874 | Real Estate
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000204772 | Tredegar Corp.
Holdings [Line Items]
Percent of Net Asset Value	7%
C000204772 | Applied Optoelectronics Inc.
Holdings [Line Items]
Percent of Net Asset Value	4.40%
C000204772 | L.B. Foster Co.
Holdings [Line Items]
Percent of Net Asset Value	2.60%
C000204772 | Park-Ohio Holdings Corp.
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000204772 | Electromed Inc.
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000204772 | Ampco-Pittsburgh Corp.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204772 | Lee Enterprises Inc.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204772 | Clarus Corp.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204772 | Inspired Entertainment Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000204772 | Velan Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000204772 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	84.20%
C000204772 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	14.60%
C000204772 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	6.70%
C000204772 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	32%
C000204772 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000204772 | Diversified Industrial
Holdings [Line Items]
Percent of Net Asset Value	19.80%
C000204772 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	14.60%
C000204772 | Consumer Products
Holdings [Line Items]
Percent of Net Asset Value	6.40%
C000204772 | Equipment and Supplies
Holdings [Line Items]
Percent of Net Asset Value	6%
C000204772 | Entertainment
Holdings [Line Items]
Percent of Net Asset Value	4.90%
C000204772 | Machinery
Holdings [Line Items]
Percent of Net Asset Value	4.60%
C000204772 | Aerospace and Defense
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000204774 | Tredegar Corp.
Holdings [Line Items]
Percent of Net Asset Value	7%
C000204774 | Applied Optoelectronics Inc.
Holdings [Line Items]
Percent of Net Asset Value	4.40%
C000204774 | L.B. Foster Co.
Holdings [Line Items]
Percent of Net Asset Value	2.60%
C000204774 | Park-Ohio Holdings Corp.
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000204774 | Electromed Inc.
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000204774 | Ampco-Pittsburgh Corp.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204774 | Lee Enterprises Inc.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204774 | Clarus Corp.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204774 | Inspired Entertainment Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000204774 | Velan Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000204774 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	84.20%
C000204774 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	14.60%
C000204774 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	6.70%
C000204774 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	32%
C000204774 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000204774 | Diversified Industrial
Holdings [Line Items]
Percent of Net Asset Value	19.80%
C000204774 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	14.60%
C000204774 | Consumer Products
Holdings [Line Items]
Percent of Net Asset Value	6.40%
C000204774 | Equipment and Supplies
Holdings [Line Items]
Percent of Net Asset Value	6%
C000204774 | Entertainment
Holdings [Line Items]
Percent of Net Asset Value	4.90%
C000204774 | Machinery
Holdings [Line Items]
Percent of Net Asset Value	4.60%
C000204774 | Aerospace and Defense
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000204771 | Tredegar Corp.
Holdings [Line Items]
Percent of Net Asset Value	7%
C000204771 | Applied Optoelectronics Inc.
Holdings [Line Items]
Percent of Net Asset Value	4.40%
C000204771 | L.B. Foster Co.
Holdings [Line Items]
Percent of Net Asset Value	2.60%
C000204771 | Park-Ohio Holdings Corp.
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000204771 | Electromed Inc.
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000204771 | Ampco-Pittsburgh Corp.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204771 | Lee Enterprises Inc.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204771 | Clarus Corp.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204771 | Inspired Entertainment Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000204771 | Velan Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000204771 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	84.20%
C000204771 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	14.60%
C000204771 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	6.70%
C000204771 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	32%
C000204771 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000204771 | Diversified Industrial
Holdings [Line Items]
Percent of Net Asset Value	19.80%
C000204771 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	14.60%
C000204771 | Consumer Products
Holdings [Line Items]
Percent of Net Asset Value	6.40%
C000204771 | Equipment and Supplies
Holdings [Line Items]
Percent of Net Asset Value	6%
C000204771 | Entertainment
Holdings [Line Items]
Percent of Net Asset Value	4.90%
C000204771 | Machinery
Holdings [Line Items]
Percent of Net Asset Value	4.60%
C000204771 | Aerospace and Defense
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000204773 | Tredegar Corp.
Holdings [Line Items]
Percent of Net Asset Value	7%
C000204773 | Applied Optoelectronics Inc.
Holdings [Line Items]
Percent of Net Asset Value	4.40%
C000204773 | L.B. Foster Co.
Holdings [Line Items]
Percent of Net Asset Value	2.60%
C000204773 | Park-Ohio Holdings Corp.
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000204773 | Electromed Inc.
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000204773 | Ampco-Pittsburgh Corp.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204773 | Lee Enterprises Inc.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204773 | Clarus Corp.
Holdings [Line Items]
Percent of Net Asset Value	2%
C000204773 | Inspired Entertainment Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000204773 | Velan Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000204773 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	84.20%
C000204773 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	14.60%
C000204773 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	6.70%
C000204773 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	32%
C000204773 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000204773 | Diversified Industrial
Holdings [Line Items]
Percent of Net Asset Value	19.80%
C000204773 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	14.60%
C000204773 | Consumer Products
Holdings [Line Items]
Percent of Net Asset Value	6.40%
C000204773 | Equipment and Supplies
Holdings [Line Items]
Percent of Net Asset Value	6%
C000204773 | Entertainment
Holdings [Line Items]
Percent of Net Asset Value	4.90%
C000204773 | Machinery
Holdings [Line Items]
Percent of Net Asset Value	4.60%
C000204773 | Aerospace and Defense
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000002865 | T-Mobile US Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002865 | Deutsche Telekom AG
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000002865 | Sony Group Corp.
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000002865 | Berkshire Hathaway Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000002865 | CNH Industrial NV, New York
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000002865 | Herc Holdings Inc.
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000002865 | Nestlé SA
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002865 | Mueller Industries Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002865 | Traton SE
Holdings [Line Items]
Percent of Net Asset Value	1.60%
C000002865 | Enpro Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000002865 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	87.20%
C000002865 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000002865 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	35.60%
C000002865 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	0%
C000002865 | Diversified Industrial
Holdings [Line Items]
Percent of Net Asset Value	6.20%
C000002865 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000002865 | Consumer Products
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000002865 | Financial Services
Holdings [Line Items]
Percent of Net Asset Value	11.70%
C000002865 | Food and Beverage
Holdings [Line Items]
Percent of Net Asset Value	11.30%
C000002865 | Electronics
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000002865 | Energy and Utilities
Holdings [Line Items]
Percent of Net Asset Value	5.90%
C000002865 | Telecommunications
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000002864 | T-Mobile US Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002864 | Deutsche Telekom AG
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000002864 | Sony Group Corp.
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000002864 | Berkshire Hathaway Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000002864 | CNH Industrial NV, New York
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000002864 | Herc Holdings Inc.
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000002864 | Nestlé SA
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002864 | Mueller Industries Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002864 | Traton SE
Holdings [Line Items]
Percent of Net Asset Value	1.60%
C000002864 | Enpro Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000002864 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	87.20%
C000002864 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000002864 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	35.60%
C000002864 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	0%
C000002864 | Diversified Industrial
Holdings [Line Items]
Percent of Net Asset Value	6.20%
C000002864 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000002864 | Consumer Products
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000002864 | Financial Services
Holdings [Line Items]
Percent of Net Asset Value	11.70%
C000002864 | Food and Beverage
Holdings [Line Items]
Percent of Net Asset Value	11.30%
C000002864 | Electronics
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000002864 | Energy and Utilities
Holdings [Line Items]
Percent of Net Asset Value	5.90%
C000002864 | Telecommunications
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000034308 | T-Mobile US Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000034308 | Deutsche Telekom AG
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000034308 | Sony Group Corp.
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000034308 | Berkshire Hathaway Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000034308 | CNH Industrial NV, New York
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000034308 | Herc Holdings Inc.
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000034308 | Nestlé SA
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000034308 | Mueller Industries Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000034308 | Traton SE
Holdings [Line Items]
Percent of Net Asset Value	1.60%
C000034308 | Enpro Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000034308 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	87.20%
C000034308 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000034308 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	35.60%
C000034308 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	0%
C000034308 | Diversified Industrial
Holdings [Line Items]
Percent of Net Asset Value	6.20%
C000034308 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000034308 | Consumer Products
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000034308 | Financial Services
Holdings [Line Items]
Percent of Net Asset Value	11.70%
C000034308 | Food and Beverage
Holdings [Line Items]
Percent of Net Asset Value	11.30%
C000034308 | Electronics
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000034308 | Energy and Utilities
Holdings [Line Items]
Percent of Net Asset Value	5.90%
C000034308 | Telecommunications
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000002862 | T-Mobile US Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002862 | Deutsche Telekom AG
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000002862 | Sony Group Corp.
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000002862 | Berkshire Hathaway Inc.
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000002862 | CNH Industrial NV, New York
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000002862 | Herc Holdings Inc.
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000002862 | Nestlé SA
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002862 | Mueller Industries Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000002862 | Traton SE
Holdings [Line Items]
Percent of Net Asset Value	1.60%
C000002862 | Enpro Inc.
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000002862 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	87.20%
C000002862 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000002862 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	35.60%
C000002862 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	0%
C000002862 | Diversified Industrial
Holdings [Line Items]
Percent of Net Asset Value	6.20%
C000002862 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000002862 | Consumer Products
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000002862 | Financial Services
Holdings [Line Items]
Percent of Net Asset Value	11.70%
C000002862 | Food and Beverage
Holdings [Line Items]
Percent of Net Asset Value	11.30%
C000002862 | Electronics
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000002862 | Energy and Utilities
Holdings [Line Items]
Percent of Net Asset Value	5.90%
C000002862 | Telecommunications
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000002873 | Siegfried Holding AG
Holdings [Line Items]
Percent of Net Asset Value	4.20%
C000002873 | Chemring Group plc
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000002873 | Endeavour Mining plc
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002873 | Laurent-Perrier
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002873 | Tamburi Investment Partners SpA
Holdings [Line Items]
Percent of Net Asset Value	3%
C000002873 | Genius Sports Ltd.
Holdings [Line Items]
Percent of Net Asset Value	3%
C000002873 | Alamos Gold Inc.
Holdings [Line Items]
Percent of Net Asset Value	3%
C000002873 | Westgold Resources Ltd.
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000002873 | Gerresheimer AG
Holdings [Line Items]
Percent of Net Asset Value	2.50%
C000002873 | Interparfums SA
Holdings [Line Items]
Percent of Net Asset Value	2.50%
C000002873 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	96.70%
C000002873 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002873 | InvestmentType_Preferred Stocks
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000002873 | Financials
Holdings [Line Items]
Percent of Net Asset Value	5.10%
C000002873 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	15.90%
C000002873 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	16.10%
C000002873 | Industrials
Holdings [Line Items]
Percent of Net Asset Value	14%
C000002873 | Consumer Staples
Holdings [Line Items]
Percent of Net Asset Value	16.20%
C000002873 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000002873 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(1.70%)
C000002873 | Information Technology
Holdings [Line Items]
Percent of Net Asset Value	10%
C000002873 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002873 | Materials
Holdings [Line Items]
Percent of Net Asset Value	19.70%
C000002871 | Siegfried Holding AG
Holdings [Line Items]
Percent of Net Asset Value	4.20%
C000002871 | Chemring Group plc
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000002871 | Endeavour Mining plc
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002871 | Laurent-Perrier
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002871 | Tamburi Investment Partners SpA
Holdings [Line Items]
Percent of Net Asset Value	3%
C000002871 | Genius Sports Ltd.
Holdings [Line Items]
Percent of Net Asset Value	3%
C000002871 | Alamos Gold Inc.
Holdings [Line Items]
Percent of Net Asset Value	3%
C000002871 | Westgold Resources Ltd.
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000002871 | Gerresheimer AG
Holdings [Line Items]
Percent of Net Asset Value	2.50%
C000002871 | Interparfums SA
Holdings [Line Items]
Percent of Net Asset Value	2.50%
C000002871 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	96.70%
C000002871 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002871 | InvestmentType_Preferred Stocks
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000002871 | Financials
Holdings [Line Items]
Percent of Net Asset Value	5.10%
C000002871 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	15.90%
C000002871 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	16.10%
C000002871 | Industrials
Holdings [Line Items]
Percent of Net Asset Value	14%
C000002871 | Consumer Staples
Holdings [Line Items]
Percent of Net Asset Value	16.20%
C000002871 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000002871 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(1.70%)
C000002871 | Information Technology
Holdings [Line Items]
Percent of Net Asset Value	10%
C000002871 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002871 | Materials
Holdings [Line Items]
Percent of Net Asset Value	19.70%
C000034310 | Siegfried Holding AG
Holdings [Line Items]
Percent of Net Asset Value	4.20%
C000034310 | Chemring Group plc
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000034310 | Endeavour Mining plc
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000034310 | Laurent-Perrier
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000034310 | Tamburi Investment Partners SpA
Holdings [Line Items]
Percent of Net Asset Value	3%
C000034310 | Genius Sports Ltd.
Holdings [Line Items]
Percent of Net Asset Value	3%
C000034310 | Alamos Gold Inc.
Holdings [Line Items]
Percent of Net Asset Value	3%
C000034310 | Westgold Resources Ltd.
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000034310 | Gerresheimer AG
Holdings [Line Items]
Percent of Net Asset Value	2.50%
C000034310 | Interparfums SA
Holdings [Line Items]
Percent of Net Asset Value	2.50%
C000034310 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	96.70%
C000034310 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000034310 | InvestmentType_Preferred Stocks
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000034310 | Financials
Holdings [Line Items]
Percent of Net Asset Value	5.10%
C000034310 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	15.90%
C000034310 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	16.10%
C000034310 | Industrials
Holdings [Line Items]
Percent of Net Asset Value	14%
C000034310 | Consumer Staples
Holdings [Line Items]
Percent of Net Asset Value	16.20%
C000034310 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000034310 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(1.70%)
C000034310 | Information Technology
Holdings [Line Items]
Percent of Net Asset Value	10%
C000034310 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000034310 | Materials
Holdings [Line Items]
Percent of Net Asset Value	19.70%
C000002872 | Siegfried Holding AG
Holdings [Line Items]
Percent of Net Asset Value	4.20%
C000002872 | Chemring Group plc
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000002872 | Endeavour Mining plc
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002872 | Laurent-Perrier
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002872 | Tamburi Investment Partners SpA
Holdings [Line Items]
Percent of Net Asset Value	3%
C000002872 | Genius Sports Ltd.
Holdings [Line Items]
Percent of Net Asset Value	3%
C000002872 | Alamos Gold Inc.
Holdings [Line Items]
Percent of Net Asset Value	3%
C000002872 | Westgold Resources Ltd.
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000002872 | Gerresheimer AG
Holdings [Line Items]
Percent of Net Asset Value	2.50%
C000002872 | Interparfums SA
Holdings [Line Items]
Percent of Net Asset Value	2.50%
C000002872 | InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	96.70%
C000002872 | InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002872 | InvestmentType_Preferred Stocks
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000002872 | Financials
Holdings [Line Items]
Percent of Net Asset Value	5.10%
C000002872 | Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	15.90%
C000002872 | Health Care
Holdings [Line Items]
Percent of Net Asset Value	16.10%
C000002872 | Industrials
Holdings [Line Items]
Percent of Net Asset Value	14%
C000002872 | Consumer Staples
Holdings [Line Items]
Percent of Net Asset Value	16.20%
C000002872 | Other Industry sectors
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000002872 | Other Assets and Liabilities (Net)
Holdings [Line Items]
Percent of Net Asset Value	(1.70%)
C000002872 | Information Technology
Holdings [Line Items]
Percent of Net Asset Value	10%
C000002872 | U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002872 | Materials
Holdings [Line Items]
Percent of Net Asset Value	19.70%