v3.23.1
Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2022
Entity Registrant Name dei_EntityRegistrantName GAMCO GLOBAL SERIES FUNDS, INC.
Entity Central Index Key dei_EntityCentralIndexKey 0000909504
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Apr. 28, 2023
Document Effective Date dei_DocumentEffectiveDate Apr. 28, 2023
Prospectus Date rr_ProspectusDate Apr. 28, 2023
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading THE GABELLI GLOBAL CONTENT & CONNECTIVITY FUND (THE “GLOBAL CONTENT & CONNECTIVITY FUND”)
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Global Content & Connectivity Fund primarily seeks to provide investors with appreciation of capital.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock

Current income is a secondary objective of the Global Content & Connectivity Fund.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Global Content & Connectivity Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The Global Content & Connectivity Fund’s respective Class AAA, Class A, and Class C shares are “closed to purchases from new investors.” “Closed to purchases from new investors” means: (i) with respect to Class AAA and Class A shares, no new investors may purchase shares of such classes, but existing shareholders may continue to purchase additional shares of such classes, and (ii) with respect to Class C shares, neither new investors nor existing shareholders may purchase any additional shares of such class. This closure has no effect on existing shareholders’ ability to redeem shares of the Global Content & Connectivity Fund as described herein.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Global Content & Connectivity Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of the Gabelli family of mutual funds when and if initial investments into Class A shares are reopened. More information about these and other discounts is available from your financial professional and in the section entitled “Classes of Shares” on page 61 of the prospectus and in Appendix A, “Sales Charge Reductions and Waivers Available through Certain Intermediaries,” attached to the Global Content & Connectivity Fund’s prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment): ​ ​ ​ ​ ​ ​
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination April 30, 2024
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Global Content & Connectivity Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when the Global Content & Connectivity Fund’s shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Global Content & Connectivity Fund’s performance. During the most recent fiscal year, the Global Content & Connectivity Fund’s portfolio turnover rate was 17% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 17.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of the Gabelli family of mutual funds when and if initial investments into Class A shares are reopened.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Global Content & Connectivity Fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the Global Content & Connectivity Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example assumes a waiver of expenses through the date of the expiration of the waiver, and reflects Total Annual Fund Operating Expenses following the date of the expiration of the waiver. The example also assumes that your investment has a 5% return each year and that the Global Content & Connectivity Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block] rr_ExpenseExampleNoRedemptionNarrativeTextBlock

You would pay the following expenses if you did not redeem your shares of the Global Content & Connectivity Fund:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Global Content & Connectivity Fund will invest its net assets in common stocks of companies in the telecommunications, media, and information technology industries which Gabelli Funds, LLC, the Global Content & Connectivity Fund’s investment adviser (the “Adviser”), believes are likely to have rapid growth in revenues and earnings and potential for above average capital appreciation or are undervalued. The Global Content & Connectivity Fund invests primarily in common stocks of foreign and domestic small capitalization, mid capitalization, and large capitalization issuers. As a “global” fund, the Global Content & Connectivity Fund invests in securities of issuers, or related investments thereof, located in at least three countries, and at least 40% of the Global Content & Connectivity Fund’s total net assets is invested in securities of non-U.S. issuers or related investments thereof. In selecting investments, the Adviser also considers the market price of the issuer’s securities, its balance sheet characteristics and the perceived strength of its management. In accordance with its existing concentration policy, the Global Content & Connectivity Fund will continue to invest at least 25% of the value of its total assets in the telecommunications-related industry, and not invest more than 25% of the value of its total assets in any other particular industry.

The companies in which the Global Content & Connectivity Fund may invest are engaged in the following products, services, or activities: telecommunications services (including data, video, voice, advanced IP-based services, corporate networking solutions, messaging and other communication and connectivity applications based on established and emerging technologies); telecommunications infrastructure and equipment; media & entertainment (including television; radio; cable networks; filmed, live, and digital entertainment; advertising; publishing; emerging forms of digital and interactive content; eSports; and eGaming); consumer electronics; e-commerce & information technology (including Internet software and services; application, systems, and home entertainment software; IT consulting, data processing, and technology hardware and equipment). Additional crossindustry investment focus areas include: cloud computing, The Internet of Things (“IoT”) (including solutions related to connected vehicle, connected home, smart city, smart grid), Big Data, artificial intelligence, machine learning, robotics, cybersecurity, virtual reality, augmented reality, digital convergence, biometric and wearable devices, eHealth, eGovernment, financial technology, over-the-top (“OTT”) content and applications, and software-as-a-service (“SaaS”).
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table that follow provide an indication of the risks of investing in the Global Content & Connectivity Fund by showing changes in the Global Content & Connectivity Fund’s performance from year to year and by showing how the Global Content & Connectivity Fund’s average annual returns for one year, five years, and ten years compared with those of broad based securities market indices. As with all mutual funds, the Global Content & Connectivity Fund’s past performance (before and after taxes) does not predict how the Global Content & Connectivity Fund will perform in the future. Updated information on the Global Content & Connectivity Fund’s results can be obtained by visiting www.gabelli.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table that follow provide an indication of the risks of investing in the Global Content & Connectivity Fund by showing changes in the Global Content & Connectivity Fund’s performance from year to year and by showing how the Global Content & Connectivity Fund’s average annual returns for one year, five years, and ten years compared with those of broad based securities market indices.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.gabelli.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, the Global Content & Connectivity Fund’s past performance (before and after taxes) does not predict how the Global Content & Connectivity Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading GLOBAL CONTENT & CONNECTIVITY FUND (Total Returns for Class AAA Shares for the Years Ended December 31)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the calendar years shown in the bar chart, the highest return for a quarter was 19.01% (quarter ended June 30, 2020), and the lowest return for a quarter was (21.79)% (quarter ended March 31, 2020).
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the years ended December 31, 2022 with maximum sales charge, if applicable)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts, including Roth IRAs and SEP IRAs (collectively, “IRAs”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class AAA shares. Actual after-tax returns for other classes will vary due to the differences in expenses.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than the “Return After Taxes on Distributions” because the investor is assumed to be able to use the capital loss from the sale of Fund shares to offset other taxable gains.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than the “Return After Taxes on Distributions” because the investor is assumed to be able to use the capital loss from the sale of Fund shares to offset other taxable gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts, including Roth IRAs and SEP IRAs (collectively, “IRAs”). After-tax returns are shown only for Class AAA shares. Actual after-tax returns for other classes will vary due to the differences in expenses.
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND | MSCI AC World Communication Services Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (35.33%)
5 Years rr_AverageAnnualReturnYear05 0.01%
10 Years rr_AverageAnnualReturnYear10 3.39%
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND | MSCI AC World Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (17.96%)
5 Years rr_AverageAnnualReturnYear05 5.75%
10 Years rr_AverageAnnualReturnYear10 8.54%
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND | GABELLI GLOBAL CONTENT & CONNECTIVITY FUND - Class AAA Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GABTX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.56%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.81% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.84%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.97%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 99
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 488
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 902
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,057
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 99
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 488
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 902
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,057
Annual Return 2013 rr_AnnualReturn2013 24.86%
Annual Return 2014 rr_AnnualReturn2014 (1.28%)
Annual Return 2015 rr_AnnualReturn2015 (2.48%)
Annual Return 2016 rr_AnnualReturn2016 2.65%
Annual Return 2017 rr_AnnualReturn2017 13.38%
Annual Return 2018 rr_AnnualReturn2018 (11.89%)
Annual Return 2019 rr_AnnualReturn2019 15.62%
Annual Return 2020 rr_AnnualReturn2020 16.42%
Annual Return 2021 rr_AnnualReturn2021 5.17%
Annual Return 2022 rr_AnnualReturn2022 (28.62%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.01%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.79%)
1 Year rr_AverageAnnualReturnYear01 (28.62%)
5 Years rr_AverageAnnualReturnYear05 (2.30%)
10 Years rr_AverageAnnualReturnYear10 2.22%
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND | GABELLI GLOBAL CONTENT & CONNECTIVITY FUND - Class AAA Shares | Return After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (29.08%)
5 Years rr_AverageAnnualReturnYear05 (3.46%)
10 Years rr_AverageAnnualReturnYear10 1.06%
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND | GABELLI GLOBAL CONTENT & CONNECTIVITY FUND - Class AAA Shares | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (16.75%)
5 Years rr_AverageAnnualReturnYear05 (1.67%)
10 Years rr_AverageAnnualReturnYear10 1.84%
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND | GABELLI GLOBAL CONTENT & CONNECTIVITY FUND - Class A Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GTCAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.56%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.81% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.84%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.97%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 668
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,035
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,425
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,514
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 668
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,035
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,425
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,514
1 Year rr_AverageAnnualReturnYear01 (32.72%)
5 Years rr_AverageAnnualReturnYear05 (3.45%)
10 Years rr_AverageAnnualReturnYear10 1.60%
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND | GABELLI GLOBAL CONTENT & CONNECTIVITY FUND - Class I Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GTTIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.56%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.56% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.59%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.97%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 99
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 435
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 794
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,806
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 99
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 435
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 794
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,806
1 Year rr_AverageAnnualReturnYear01 (28.62%)
5 Years rr_AverageAnnualReturnYear05 (2.02%)
10 Years rr_AverageAnnualReturnYear10 2.54%
The Gabelli Global Growth Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading THE GABELLI GLOBAL GROWTH FUND (THE “GLOBAL GROWTH FUND”)
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Global Growth Fund primarily seeks to provide investors with appreciation of capital.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock

Current income is a secondary objective of the Global Growth Fund.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Global Growth Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The Global Growth Fund’s Class AAA and Class C shares are “closed to purchases from new investors.” “Closed to purchases from new investors” means: (i) with respect to Class AAA shares, no new investors may purchase shares of such class, but existing shareholders may continue to purchase additional shares of such class, and (ii) with respect to Class C shares, neither new investors nor existing shareholders may purchase any additional shares of such class. This closure has no effect on existing shareholders’ ability to redeem shares of the Global Growth Fund as described herein.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Global Growth Fund. You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of the Gabelli family of mutual funds. More information about these and other discounts is available from your financial professional and in the section entitled “Classes of Shares” on page 61 of the prospectus and in Appendix A, “Sales Charge Reductions and Waivers Available through Certain Intermediaries,” attached to the Global Growth Fund’s prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment): ​ ​ ​ ​ ​ ​
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that are deducted from Fund assets): ​ ​ ​ ​ ​ ​
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination April 30, 2024
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Global Growth Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when the Global Growth Fund’s shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Global Growth Fund’s performance. During the most recent fiscal year, the Global Growth Fund’s portfolio turnover rate was 36% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 36.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of the Gabelli family of mutual funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Global Growth Fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the Global Growth Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example assumes a waiver of expenses through the date of the expiration of the waiver, and reflects Total Annual Fund Operating Expenses following the date of the expiration of the waiver. The example also assumes that your investment has a 5% return each year and that the Global Growth Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block] rr_ExpenseExampleNoRedemptionNarrativeTextBlock

You would pay the following expenses if you did not redeem your shares of the Global Growth Fund:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Global Growth Fund will invest at least 65% of its total assets in common stocks of companies which the portfolio manager believes are likely to have rapid growth in revenues and earnings and potential for above average capital appreciation or are undervalued. The Global Growth Fund invests primarily in common stocks of foreign and domestic small capitalization, mid capitalization, and large capitalization issuers. As a “global” fund, the Global Growth Fund invests in securities of issuers, or related investments thereof, located in at least three countries, and at least 40% of the Global Growth Fund’s total net assets is invested in securities of non-U.S. issuers or related investments thereof.

To achieve the Global Growth Fund’s primary objective of capital appreciation, the Adviser employs a disciplined investment program focusing on the globalization and interactivity of the world’s market place. The Global Growth Fund invests in companies at the forefront of accelerated growth.

The Global Growth Fund invests primarily in common stocks of foreign and domestic mid capitalization and large capitalization issuers. In addition to growth rates, stock valuation levels are important in the stock selection process as the Global Growth Fund seeks stocks that are attractively priced relative to their projected growth rates. The Global Growth Fund seeks to build a portfolio diversified by geographic region, industry sectors and individual issues within industry sectors. The Global Growth Fund invests primarily in developed markets but may invest in emerging markets as well. The Global Growth Fund invests in companies with a wide range in market capitalizations, from small to large.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table that follow provide an indication of the risks of investing in the Global Growth Fund by showing changes in the Global Growth Fund’s performance from year to year and by showing how the Global Growth Fund’s average annual returns for one year, five years, and ten years compared with those of broad based securities market indices. As with all mutual funds, the Global Growth Fund’s past performance (before and after taxes) does not predict how the Global Growth Fund will perform in the future. Updated information on the Global Growth Fund’s results can be obtained by visiting www.gabelli.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table that follow provide an indication of the risks of investing in the Global Growth Fund by showing changes in the Global Growth Fund’s performance from year to year and by showing how the Global Growth Fund’s average annual returns for one year, five years, and ten years compared with those of broad based securities market indices.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.gabelli.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, the Global Growth Fund’s past performance (before and after taxes) does not predict how the Global Growth Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading GLOBAL GROWTH FUND (Total Returns for Class AAA Shares for the Years Ended December 31)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the calendar years shown in the bar chart, the highest return for a quarter was 24.94% (quarter ended June 30, 2020), and the lowest return for a quarter was (25.94)% (quarter ended March 31, 2022).
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the years ended December 31, 2022 with maximum sales charge, if applicable)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Global Growth Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts, including Roth IRAs and SEP IRAs (collectively, “IRAs”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown Actual after-tax returns for other classes will vary due to the differences in expenses.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than the “Return After Taxes on Distributions” because the investor is assumed to have sufficient capital gains of the same character from other investments to offset any capital losses from the redemption so that the taxpayer may deduct the capital losses in full.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than the “Return After Taxes on Distributions” because the investor is assumed to have sufficient capital gains of the same character from other investments to offset any capital losses from the redemption so that the taxpayer may deduct the capital losses in full. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Global Growth Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts, including Roth IRAs and SEP IRAs (collectively, “IRAs”). After-tax returns are shown only for Class AAA shares. Actual after-tax returns for other classes will vary due to the differences in expenses.
The Gabelli Global Growth Fund | MSCI AC World Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (17.96%)
5 Years rr_AverageAnnualReturnYear05 5.75%
10 Years rr_AverageAnnualReturnYear10 8.54%
The Gabelli Global Growth Fund | Lipper Global Large Cap Growth Fund Classification  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (26.96%)
5 Years rr_AverageAnnualReturnYear05 5.56%
10 Years rr_AverageAnnualReturnYear10 8.43%
The Gabelli Global Growth Fund | The Gabelli Global Growth Fund - Class AAA Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GICPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.52% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 419
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 770
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,760
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 92
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 419
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 770
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,760
Annual Return 2013 rr_AnnualReturn2013 28.75%
Annual Return 2014 rr_AnnualReturn2014 3.90%
Annual Return 2015 rr_AnnualReturn2015 (1.21%)
Annual Return 2016 rr_AnnualReturn2016 1.20%
Annual Return 2017 rr_AnnualReturn2017 29.02%
Annual Return 2018 rr_AnnualReturn2018 (2.80%)
Annual Return 2019 rr_AnnualReturn2019 30.73%
Annual Return 2020 rr_AnnualReturn2020 35.43%
Annual Return 2021 rr_AnnualReturn2021 21.10%
Annual Return 2022 rr_AnnualReturn2022 (37.45%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 24.94%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.94%)
1 Year rr_AverageAnnualReturnYear01 (37.45%)
5 Years rr_AverageAnnualReturnYear05 5.44%
10 Years rr_AverageAnnualReturnYear10 8.44%
The Gabelli Global Growth Fund | The Gabelli Global Growth Fund - Class AAA Shares | Return After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (37.48%)
5 Years rr_AverageAnnualReturnYear05 4.26%
10 Years rr_AverageAnnualReturnYear10 7.05%
The Gabelli Global Growth Fund | The Gabelli Global Growth Fund - Class AAA Shares | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (22.15%)
5 Years rr_AverageAnnualReturnYear05 4.28%
10 Years rr_AverageAnnualReturnYear10 6.67%
The Gabelli Global Growth Fund | The Gabelli Global Growth Fund - Class A Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GGGAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.52% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 970
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,301
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,233
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 662
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 970
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,301
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,233
1 Year rr_AverageAnnualReturnYear01 (41.06%)
5 Years rr_AverageAnnualReturnYear05 4.19%
10 Years rr_AverageAnnualReturnYear10 7.80%
The Gabelli Global Growth Fund | The Gabelli Global Growth Fund - Class I Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GGGIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.27% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.37%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 366
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 661
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,501
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 92
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 366
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 661
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,501
1 Year rr_AverageAnnualReturnYear01 (37.43%)
5 Years rr_AverageAnnualReturnYear05 5.58%
10 Years rr_AverageAnnualReturnYear10 8.81%
GABELLI INTERNATIONAL SMALL CAP FUND  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading THE GABELLI INTERNATIONAL SMALL CAP FUND (THE “INTERNATIONAL SMALL CAP FUND”)
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The International Small Cap Fund primarily seeks to provide investors with appreciation of capital.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock

Current income is a secondary objective of the International Small Cap Fund.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the International Small Cap Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The International Small Cap Fund’s respective Class AAA, Class A and Class C shares are “closed to purchases from new investors.” “Closed to purchases from new investors” means: (i) with respect to Class AAA and Class A shares, no new investors may purchase shares of such classes, but existing shareholders may continue to purchase additional shares of such classes, and (ii) with respect to Class C shares, neither new investors nor existing shareholders may purchase any additional shares of such class. This closure has no effect on existing shareholders’ ability to redeem shares of the International Small Cap Fund as described herein.

This table describes the fees and expenses that you may pay if you buy and hold shares of the International Small Cap Fund. You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of the Gabelli family of mutual funds when and if initial investments into Class A shares are reopened. More information about these and other discounts is available from your financial professional and in the section entitled “Classes of Shares” on page 61 of the prospectus and in Appendix A, “Sales Charge Reductions and Waivers Available through Certain Intermediaries,” attached to the prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment): ​ ​ ​ ​ ​ ​
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses(expenses that you are deducted from Fund assets): ​ ​ ​ ​ ​ ​
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination April 30, 2024
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The International Small Cap Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when the International Small Cap Fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the International Small Cap Fund’s performance. During the most recent fiscal year, the International Small Cap Fund’s portfolio turnover rate was 5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 5.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of the Gabelli family of mutual funds when and if initial investments into Class A shares are reopened.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the International Small Cap Fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the International Small Cap Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example assumes a waiver of expenses through the date of the expiration of the waiver, and reflects Total Annual Fund Operating Expenses following the date of the expiration of the waiver. The example also assumes that your investment has a 5% return each year and that the International Small Cap Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block] rr_ExpenseExampleNoRedemptionNarrativeTextBlock

You would pay the following expenses if you did not redeem your shares of the International Small Cap Fund:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The International Small Cap Fund will invest primarily in a portfolio of common stocks of non-U.S. companies. In determining whether an issuer is a U.S. or non-U.S. company, the International Small Cap Fund will consider various factors including its country of domicile, the primary stock exchange on which it trades, the location from which the majority of its revenue comes, and its reporting currency. Under normal market conditions, the International Small Cap Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in the stocks of “small cap companies.” The Adviser currently characterizes small capitalization companies as those with total common stock market values of $3 billion or less at the time of investment. The investment policy of the International Small Cap Fund relating to the type of securities in which 80% of the International Small Cap Fund’s net assets must be invested may be changed by the Board without shareholder approval. Shareholders will, however, receive at least sixty days notice prior to any change in this policy.

The International Small Cap Fund may invest in non-U.S. markets throughout the world, including emerging markets. The International Small Cap Fund considers emerging markets to be markets located in countries classified as emerging or frontier markets by MSCI, and are generally located in the Asia-Pacific region, Eastern Europe, the Middle East, Central and South America, and Africa. Ordinarily, the International Small Cap Fund will invest in the securities of issuers located in at least five countries outside the U.S. There are no geographic limits on the International Small Cap Fund’s non-U.S. investments.

In selecting investments, the Adviser seeks issuers with a dominant market share or niche franchise in growing and/or consolidating industries. The Adviser considers for purchase the stocks of small capitalization (capitalization is the price per share multiplied by the number of shares outstanding) companies with experienced management, strong balance sheets, and rising free cash flow and earnings. The Adviser’s goal is to invest long term in the stocks of companies trading at reasonable market valuations relative to perceived economic worth.

Frequently, smaller capitalization companies exhibit one or more of the following traits:

•New products or technologies

•New distribution methods

•Rapid changes in industry conditions due to regulatory or other developments

•Changes in management or similar characteristics that may result not only in expected growth in revenues but in an accelerated or above average rate of earnings growth, which would usually be reflected in capital appreciation.

In addition, because smaller capitalization companies are less actively followed by stock analysts and less information is available on which to base stock price evaluations, the market may overlook favorable trends in particular smaller growth companies and then adjust its valuation more quickly once investor interest is gained.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table that follow provide an indication of the risks of investing in the International Small Cap Fund by showing changes in the International Small Cap Fund’s performance from year to year and by showing how the International Small Cap Fund’s average annual returns for one year, five years, and ten years compared with those of a broad based securities market index. As with all mutual funds, the International Small Cap Fund’s past performance (before and after taxes) does not predict how the International Small Cap Fund will perform in the future. Updated information on the International Small Cap Fund’s results can be obtained by visiting www.gabelli.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table that follow provide an indication of the risks of investing in the International Small Cap Fund by showing changes in the International Small Cap Fund’s performance from year to year and by showing how the International Small Cap Fund’s average annual returns for one year, five years, and ten years compared with those of a broad based securities market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.gabelli.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, the International Small Cap Fund’s past performance (before and after taxes) does not predict how the International Small Cap Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading INTERNATIONAL SMALL CAP FUND (Total Returns for Class AAA Shares for the Years Ended December 31)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the calendar years shown in the bar chart, the highest return for a quarter was 21.47% (quarter ended June 30, 2020), and the lowest return for a quarter was (25.11)% (quarter ended March 31, 2020).
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the years ended December 31, 2022 with maximum sales charge, if applicable)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their International Small Cap Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts, including Roth IRAs and SEP IRAs (collectively, “IRAs”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class AAA shares. After-tax returns for other classes will vary due to the differences in expenses.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than the “Return After Taxes on Distributions” because the investor is assumed to have sufficient capital gains of the same character from other investments to offset any capital losses from the redemption so that the taxpayer may deduct the capital losses in full.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than the “Return After Taxes on Distributions” because the investor is assumed to have sufficient capital gains of the same character from other investments to offset any capital losses from the redemption so that the taxpayer may deduct the capital losses in full. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their International Small Cap Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts, including Roth IRAs and SEP IRAs (collectively, “IRAs”). After-tax returns are shown only for Class AAA shares. After-tax returns for other classes will vary due to the differences in expenses.
GABELLI INTERNATIONAL SMALL CAP FUND | MSCI EAFE Small Cap Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (21.39%)
5 Years rr_AverageAnnualReturnYear05 (0.05%)
10 Years rr_AverageAnnualReturnYear10 6.21%
GABELLI INTERNATIONAL SMALL CAP FUND | GABELLI INTERNATIONAL SMALL CAP FUND - Class AAA Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GABOX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.39%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.64% [3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.72%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.92%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 94
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 862
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,651
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,720
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 94
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 862
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,651
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,720
Annual Return 2013 rr_AnnualReturn2013 18.94%
Annual Return 2014 rr_AnnualReturn2014 (1.17%)
Annual Return 2015 rr_AnnualReturn2015 0.19%
Annual Return 2016 rr_AnnualReturn2016 1.12%
Annual Return 2017 rr_AnnualReturn2017 28.09%
Annual Return 2018 rr_AnnualReturn2018 (20.87%)
Annual Return 2019 rr_AnnualReturn2019 25.94%
Annual Return 2020 rr_AnnualReturn2020 19.16%
Annual Return 2021 rr_AnnualReturn2021 4.16%
Annual Return 2022 rr_AnnualReturn2022 (25.50%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 21.47%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.11%)
1 Year rr_AverageAnnualReturnYear01 (25.50%)
5 Years rr_AverageAnnualReturnYear05 (1.62%)
10 Years rr_AverageAnnualReturnYear10 3.46%
GABELLI INTERNATIONAL SMALL CAP FUND | GABELLI INTERNATIONAL SMALL CAP FUND - Class AAA Shares | Return After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (25.49%)
5 Years rr_AverageAnnualReturnYear05 (3.20%)
10 Years rr_AverageAnnualReturnYear10 1.60%
GABELLI INTERNATIONAL SMALL CAP FUND | GABELLI INTERNATIONAL SMALL CAP FUND - Class AAA Shares | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (14.95%)
5 Years rr_AverageAnnualReturnYear05 (1.27%)
10 Years rr_AverageAnnualReturnYear10 2.78%
GABELLI INTERNATIONAL SMALL CAP FUND | GABELLI INTERNATIONAL SMALL CAP FUND - Chass A Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GOCAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.39%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.64% [3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.72%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.92%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 663
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,387
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,131
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 4,081
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 663
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,387
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 2,131
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 4,081
1 Year rr_AverageAnnualReturnYear01 (29.83%)
5 Years rr_AverageAnnualReturnYear05 (3.16%)
10 Years rr_AverageAnnualReturnYear10 2.62%
GABELLI INTERNATIONAL SMALL CAP FUND | GABELLI INTERNATIONAL SMALL CAP FUND - Class I Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GLOIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.39%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.39% [3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.47%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.92%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 94
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 811
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,551
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,509
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 94
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 811
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,551
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,509
1 Year rr_AverageAnnualReturnYear01 (25.57%)
5 Years rr_AverageAnnualReturnYear05 (1.64%)
10 Years rr_AverageAnnualReturnYear10 3.74%
The Gabelli Global Rising Income and Dividend Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading THE GABELLI GLOBAL RISING INCOME AND DIVIDEND FUND (THE “GRID FUND”)
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The GRID Fund seeks to provide investors with a high level of total return through a combination of current income and appreciation of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the GRID Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The GRID Fund’s Class AAA, Class A and Class C shares are “closed to purchases from new investors.” “Closed to purchases from new investors” means: (i) with respect to Class AAA and Class A shares, no new investors may purchase shares of such classes, but existing shareholders may continue to purchase additional shares of such classes, and (ii) with respect to Class C shares, neither new investors nor existing shareholders may purchase any additional shares of such class. This closure has no effect on existing shareholders’ ability to redeem shares of the GRID Fund as described herein.

This table describes the fees and expenses that you may pay if you buy and hold shares of the GRID Fund. You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of the Gabelli family of mutual funds when and if initial investments into Class A shares are reopened. More information about these and other discounts is available from your financial professional and in the section entitled “Classes of Shares” on page 61 of the prospectus and in Appendix A, “Sales Charge Reductions and Waivers Available through Certain Intermediaries,” attached to the GRID Fund’s prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption ​ ​ Class AAA Shares ​ Class A Shares ​ Class I Shares Shareholder Fees (fees paid directly from your investment): ​ ​ ​ ​ ​ ​
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment):
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination April 30, 2024
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The GRID Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when the GRID Fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the GRID Fund’s performance. During the most recent fiscal year, the GRID Fund’s portfolio turnover rate was 11% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 11.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of the Gabelli family of mutual funds when and if initial investments into Class A shares are reopened.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the GRID Fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the GRID Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example assumes a waiver of expenses through the date of the expiration of the waiver, and reflects Total Annual Fund Operating Expenses following the date of the expiration of the waiver. The example also assumes that your investment has a 5% return each year and that the GRID Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block] rr_ExpenseExampleNoRedemptionNarrativeTextBlock

You would pay the following expenses if you did not redeem your shares of the GRID Fund:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The GRID Fund will attempt to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets in dividend paying securities (such as common and preferred stock) or other income producing securities (such as fixed income securities and securities that are convertible into common

stock). The GRID Fund will primarily invest in common stocks of foreign and domestic issuers that the GRID Fund’s portfolio manager believes are likely to pay dividends and income and have the potential for above average capital appreciation and dividend increases. To this end, the portfolio manager may invest in stocks that pay and increase dividends over time that can potentially provide “rising income.” Rising income stocks historically have provided a better total return over time, potentially combat inflation and offer the opportunity to potentially take advantage of compounding through dividend and income reinvestment. Under normal circumstances, the GRID Fund intends to invest in at least three countries, including the United States, and will invest at least 40% of its total assets in countries other than the United States.

The GRID Fund invests in companies whose stocks the Adviser believes are selling at a significant discount to their “private market value.” Private market value is the value the Adviser believes informed investors would be willing to pay to acquire the entire company. If investor attention is focused on the underlying asset value of a company due to expected or actual developments or other catalysts, an investment opportunity to realize this private market value may exist.

The GRID Fund may utilize certain “arbitrage” strategies. The GRID Fund’s use of arbitrage may be described as investing in “event” driven situations such as announced mergers, acquisitions, and reorganizations. When a company agrees to be acquired by another company, its stock price often quickly rises to just below the stated acquisition price. If the Adviser, through extensive research, determines that the acquisition is likely to be consummated on schedule at the stated acquisition price, then the GRID Fund may purchase the selling company’s securities, offering the GRID Fund the possibility of generous returns relative to cash equivalents with a limited risk of excessive loss of capital.

The GRID Fund may invest in convertible securities, which include bonds, debentures, corporate notes, preferred stocks, and other similar securities which are convertible or exchangeable for common stock within a particular time period at a specified price or formula, of foreign and domestic companies with no target maturity range. Because many convertible securities are rated below investment grade, the GRID Fund may invest without limit in convertible securities rated lower than “BBB” by Standard & Poor’s Rating Services (“S&P”) or “Baa” or lower by Moody’s Investors Service, Inc. (“Moody’s”), or, if unrated, are of comparable quality as determined by the Adviser, including up to 5% of its assets in convertible securities of issuers in default. The GRID Fund also may invest up to 25% of its assets in non-convertible fixed income securities that are below investment grade, including up to 5% of its assets in non-convertible fixed income securities of issuers that are in default.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table that follow provide an indication of the risks of investing in the GRID Fund by showing changes in the GRID Fund’s performance from year to year and by showing how the GRID Fund’s average annual returns for one year, five years, and ten years compared with those of a broad based securities market index. Substantially all of the GRID Fund’s operating history and performance results have been achieved implementing different investment strategies under the GRID Fund’s previous names, the GAMCO Vertumnus Fund and the GAMCO Global Convertible Securities Fund, and as such, the GRID Fund’s past performance (before and after taxes) does not predict how the GRID Fund will perform in the future. Updated information on the GRID Fund’s results can be obtained by visiting www.gabelli.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table that follow provide an indication of the risks of investing in the GRID Fund by showing changes in the GRID Fund’s performance from year to year and by showing how the GRID Fund’s average annual returns for one year, five years, and ten years compared with those of a broad based securities market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.gabelli.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Substantially all of the GRID Fund’s operating history and performance results have been achieved implementing different investment strategies under the GRID Fund’s previous names, the GAMCO Vertumnus Fund and the GAMCO Global Convertible Securities Fund, and as such, the GRID Fund’s past performance (before and after taxes) does not predict how the GRID Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading GRID FUND (Total Returns for Class AAA Shares for the Years Ended December 31)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the calendar years shown in the bar chart, the highest return for a quarter was 20.32% (quarter ended December 31, 2020), and the lowest return for a quarter was (24.71)% (quarter ended March 31, 2020).
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the years ended December 31, 2022 with maximum sales charge, if applicable)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their GRID Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts, including Roth IRAs and SEP IRAs (collectively, “IRAs”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class AAA shares. After-tax returns for other classes will vary due to the differences in expenses.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than the “Return After Taxes on Distributions” because the investor is assumed to have sufficient capital gains of the same character from other investments to offset any capital losses from the redemption so that the taxpayer may deduct the capital losses in full.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than the “Return After Taxes on Distributions” because the investor is assumed to have sufficient capital gains of the same character from other investments to offset any capital losses from the redemption so that the taxpayer may deduct the capital losses in full. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their GRID Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts, including Roth IRAs and SEP IRAs (collectively, “IRAs”). After-tax returns are shown only for Class AAA shares. After-tax returns for other classes will vary due to the differences in expenses.
The Gabelli Global Rising Income and Dividend Fund | MSCI World Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (17.73%)
5 Years rr_AverageAnnualReturnYear05 6.69%
10 Years rr_AverageAnnualReturnYear10 9.44%
The Gabelli Global Rising Income and Dividend Fund | The Gabelli Global Rising Income and Dividend Fund - Class AAA Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GAGCX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.65% [4]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.75%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 447
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 826
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,892
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 92
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 447
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 826
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,892
Annual Return 2013 rr_AnnualReturn2013 14.25%
Annual Return 2014 rr_AnnualReturn2014 1.59%
Annual Return 2015 rr_AnnualReturn2015 0.59%
Annual Return 2016 rr_AnnualReturn2016 5.41%
Annual Return 2017 rr_AnnualReturn2017 20.91%
Annual Return 2018 rr_AnnualReturn2018 (14.02%)
Annual Return 2019 rr_AnnualReturn2019 14.38%
Annual Return 2020 rr_AnnualReturn2020 11.68%
Annual Return 2021 rr_AnnualReturn2021 21.32%
Annual Return 2022 rr_AnnualReturn2022 (15.63%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.32%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.71%)
1 Year rr_AverageAnnualReturnYear01 (15.63%)
5 Years rr_AverageAnnualReturnYear05 2.37%
10 Years rr_AverageAnnualReturnYear10 5.28%
The Gabelli Global Rising Income and Dividend Fund | The Gabelli Global Rising Income and Dividend Fund - Class AAA Shares | Return After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (16.25%)
5 Years rr_AverageAnnualReturnYear05 2.07%
10 Years rr_AverageAnnualReturnYear10 4.99%
The Gabelli Global Rising Income and Dividend Fund | The Gabelli Global Rising Income and Dividend Fund - Class AAA Shares | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (8.67%)
5 Years rr_AverageAnnualReturnYear05 1.90%
10 Years rr_AverageAnnualReturnYear10 4.24%
The Gabelli Global Rising Income and Dividend Fund | The Gabelli Global Rising Income and Dividend Fund - Class A Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GAGAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.65% [4]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.75%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 996
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,354
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,358
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 662
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 996
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,354
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,358
1 Year rr_AverageAnnualReturnYear01 (20.47%)
5 Years rr_AverageAnnualReturnYear05 1.16%
10 Years rr_AverageAnnualReturnYear10 4.65%
The Gabelli Global Rising Income and Dividend Fund | The Gabelli Global Rising Income and Dividend Fund - Class I Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GAGIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.40% [4]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.50%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 394
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 718
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,636
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 92
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 394
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 718
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,636
1 Year rr_AverageAnnualReturnYear01 (15.61%)
5 Years rr_AverageAnnualReturnYear05 2.64%
10 Years rr_AverageAnnualReturnYear10 5.60%
Gabelli Global Mini Mites Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading GABELLI GLOBAL MINI MITESTM FUND (THE “GLOBAL MINI MITES FUND”)
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Global Mini Mites Fund primarily seeks to provide investors with long term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Global Mini Mites Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The Global Mini Mites Fund’s respective Class AAA, Class A and Class C shares are “closed to purchases from new investors.” “Closed to purchases from new investors” means: (i) with respect to Class AAA and Class A shares, no new investors may purchase shares of such classes, but existing shareholders may continue to purchase additional shares of such classes, and (ii) with respect to Class C shares, neither new investors nor existing shareholders may purchase any additional shares of such class. This closure has no effect on existing shareholders’ ability to redeem shares of the Global Mini Mites Fund as described herein.

This table describes the fees and expenses that you may pay if you buy and hold shares of the Global Mini Mites Fund. You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of the Gabelli family of mutual funds when and if initial investments into Class A shares are reopened. More information about these and other discounts is available from your financial professional and in the section entitled “Classes of Shares” on page 61 of the prospectus and in Appendix A, “Sales Charge Reductions and Waivers Available through Certain Intermediaries,” attached to the Global Mini Mites Fund’s prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment):
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination April 30, 2024
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Global Mini Mites Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when the Global Mini Mites Fund’s shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Global Mini Mites Fund’s performance. During the most recent fiscal year, the Global Mini Mites Fund’s portfolio turnover rate was 30% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 30.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of the Gabelli family of mutual funds when and if initial investments into Class A shares are reopened.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Global Mini Mites Fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the Global Mini Mites Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example assumes a waiver of expenses through the date of the expiration of the waiver, and reflects Total Annual Fund Operating Expenses following the date of the expiration of the waiver. The example also assumes that your investment has a 5% return each year and that the Global Mini Mites Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block] rr_ExpenseExampleNoRedemptionNarrativeTextBlock

You would pay the following expenses if you did not redeem your shares of the Global Mini Mites Fund:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Global Mini Mites Fund primarily invests in equity securities of micro-cap companies, which the Global Mini Mites Fund defines as companies that have a market capitalization (defined as shares outstanding multiplied by the current market price) of $250 million or less at the time of the Global Mini Mites Fund’s investment. Equity securities include common stocks (including indirect holdings of common stock through depositary receipts), as well as other equity securities such as preferred stocks and convertible securities. Micro-cap companies may be engaged in new and emerging industries. Microcap companies are generally not well-known to investors and have less of an investor following than larger companies.

As a “global” fund, the Global Mini Mites Fund invests in securities of issuers, or related investments thereof, located in at least three countries, and at least 40% of the Global Mini Mites Fund’s total net assets are invested in securities of non-U.S. issuers or related investments thereof (such as depositary receipts and derivative instruments). The Global Mini Mites Fund may invest in companies located in developed or emerging markets as well as in non-equity securities, such as corporate bonds or other debt securities or financial instruments, including foreign debt securities.

The Adviser’s investment philosophy with respect to buying and selling equity securities is to identify assets that are selling in the public market at a discount to their private market value (“PMV”), and the Global Mini Mites Fund focuses on micro-cap companies that appear to be underpriced relative to their PMV. PMV is the value the Adviser believes informed purchasers would be willing to pay to acquire a company or other assets with similar characteristics. The Adviser considers factors such as price, earnings expectations, earnings and price histories, balance sheet characteristics, and perceived management skills. The Adviser also considers changes in economic and political outlooks as well as individual corporate developments. Further, the Adviser looks for catalysts, factors indigenous to the company, its industry or geographic positioning that may surface additional value, including, but not limited to, industry developments, regulatory changes, changes in management, sale or spin-off of a division, or the development of a profitable new business.

Additionally, the Adviser may also consider the securities of companies that appear to have favorable yet undervalued prospects for earnings growth and price appreciation. In this regard, the Adviser may invest the Global Mini Mites Fund’s assets in companies that it believes have above average or expanding market shares, profit margins, and returns on equity. In evaluating growth prospects, the Adviser uses fundamental security analysis to develop earnings forecasts for companies and to identify investment opportunities. The Adviser bases its analysis on general economic and industry data provided by the U.S. Government, various trade associations and other sources, and published corporate financial data such as annual reports and quarterly statements as well as direct interviews with company management. When applying a growth strategy, the Adviser seeks to invest in companies with high future earnings potential relative to their current market valuations.

The Adviser expects to seek to sell investments that lose their perceived value relative to other investments, which could occur because of, among other things, a security reaching a predetermined price target, a change to a company’s fundamentals that make the risk/reward profile unattractive, or a need to improve the overall risk/reward profile of the Global Mini Mites Fund.

The Global Mini Mites Fund may invest in non-U.S. equity securities through depositary receipts, including American Depositary Receipts (“ADRs”), European Depositary Receipts (“EDRs”), Global Depositary Receipts (“GDRs”) and other similar global instruments, which are generally subject to risks associated with equity securities and investments in foreign (non-U.S.) securities. ADRs are receipts issued by U.S. banks or trust companies in respect of securities of foreign issuers held on deposit for use in the U.S. securities markets. EDRs, which are sometimes referred to as Continental Depositary Receipts, are receipts issued in Europe, typically by non-U.S. banks and trust companies, that evidence ownership of either non-U.S. or domestic underlying securities. GDRs are depositary receipts structured like global debt issues to facilitate trading on an international basis. ADRs are usually denominated in U.S. dollars and dividends and other payments from the issuer are converted by the custodian into U.S. dollars before payment to receipt holders. In most other respects, ADRs, EDRs and GDRs for foreign securities have the same characteristics as the underlying securities.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table that follow provide an indication of the risks of investing in the Global Mini Mites Fund by showing changes in the Global Mini Mites Fund’s performance from year to year and by showing how the Global Mini Mites Fund’s average annual returns for one year compared with those of a broad based securities market index. As with all mutual funds, the Global Mini Mites Fund’s past performance (before and after taxes) does not predict how the Global Mini Mites Fund will perform in the future. Updated information on the Global Mini Mites Fund’s results can be obtained by visiting www.gabelli.com
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table that follow provide an indication of the risks of investing in the Global Mini Mites Fund by showing changes in the Global Mini Mites Fund’s performance from year to year and by showing how the Global Mini Mites Fund’s average annual returns for one year compared with those of a broad based securities market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.gabelli.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, the Global Mini Mites Fund’s past performance (before and after taxes) does not predict how the Global Mini Mites Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading GLOBAL MINI MITES FUND (Total Returns for Class AAA Shares for the Years Ended December 31)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the calendar years shown in the bar chart, the highest return for a quarter was 33.95% (quarter ended December 31, 2020) and the lowest return for a quarter was (32.61)% (quarter ended March 31, 2020).
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2022, with maximum sales charges, if applicable)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate fter-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Global Mini Mites Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts, including Roth IRAs and SEP IRAs (collectively, “IRAs”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class AAA shares. After-tax returns for other classes will vary due to the differences in expenses.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher n some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than the “Return After Taxes on Distributions” because the investor is assumed to have sufficient capital gains of the same character from other investments to offset any capital losses from the redemption so that the taxpayer may deduct the capital losses in full.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than the “Return After Taxes on Distributions” because the investor is assumed to have sufficient capital gains of the same character from other investments to offset any capital losses from the redemption so that the taxpayer may deduct the capital losses in full. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Global Mini Mites Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts, including Roth IRAs and SEP IRAs (collectively, “IRAs”). After-tax returns are shown only for Class AAA shares. After-tax returns for other classes will vary due to the differences in expenses.
Gabelli Global Mini Mites Fund | S&P Developed SmallCap Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (18.31%)
Since Inception rr_AverageAnnualReturnSinceInception 3.01%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2018
Gabelli Global Mini Mites Fund | Gabelli Global Mini Mites Fund - Class AAA Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GAMNX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.15%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.40% [5]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.50%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 811
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,554
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,516
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 92
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 811
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,554
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,516
Annual Return 2019 rr_AnnualReturn2019 11.49%
Annual Return 2020 rr_AnnualReturn2020 15.87%
Annual Return 2021 rr_AnnualReturn2021 19.25%
Annual Return 2022 rr_AnnualReturn2022 (16.17%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 33.95%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (32.61%)
1 Year rr_AverageAnnualReturnYear01 (16.17%)
Since Inception rr_AverageAnnualReturnSinceInception 2.58%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2018
Gabelli Global Mini Mites Fund | Gabelli Global Mini Mites Fund - Class AAA Shares | Return After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (17.33%)
Since Inception rr_AverageAnnualReturnSinceInception 0.81%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2018
Gabelli Global Mini Mites Fund | Gabelli Global Mini Mites Fund - Class AAA Shares | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (8.78%)
Since Inception rr_AverageAnnualReturnSinceInception 1.62%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2018
Gabelli Global Mini Mites Fund | Gabelli Global Mini Mites Fund - Class A Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GMNAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.15%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.40% [5]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.50%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,339
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,039
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,889
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 662
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,339
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 2,039
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,889
1 Year rr_AverageAnnualReturnYear01 (20.99%)
Since Inception rr_AverageAnnualReturnSinceInception 1.16%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2018
Gabelli Global Mini Mites Fund | Gabelli Global Mini Mites Fund - Class I Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GGMMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.15%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.15% [5]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.25%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 760
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,453
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,301
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 92
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 760
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,453
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,301
1 Year rr_AverageAnnualReturnYear01 (16.17%)
Since Inception rr_AverageAnnualReturnSinceInception 2.64%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2018
[1] The Adviser has contractually agreed to waive its investment advisory fees and/or to reimburse expenses of the Global Content & Connectivity Fund to the extent necessary to maintain the Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement (excluding brokerage costs, acquired fund fees and expenses, interest, taxes, and extraordinary expenses) at no more than an annual rate of 0.90% for all classes of shares. Under this same arrangement, the Global Content & Connectivity Fund has also agreed, during the two year period following the year of any such waiver or reimbursement by the Adviser, to repay such amount, but only to the extent the Global Content & Connectivity Fund’s adjusted Total Annual Fund Operating Expenses would not exceed an annual rate of 0.90% for the applicable class of shares, after giving effect to the repayments. This arrangement is in effect through April 30, 2024, and may be terminated only by the Board of Directors of the Corporation (the “Board”) before such time. The Global Content & Connectivity Fund will carry forward any fees and expenses in excess of the expense limitation and repay the Adviser such amount provided the Global Content & Connectivity Fund is able to do so without exceeding the lesser of (1) the expense limit in effect at the time of the waiver or reimbursement, as applicable, or (2) the expense limit in effect at the time of recoupment after giving effect to the repayment.
[2] The Adviser has contractually agreed to waive its investment advisory fees and/or to reimburse expenses of the Global Growth Fund to the extent necessary to maintain the Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement (excluding brokerage costs, acquired fund fees and expenses, interest, taxes, and extraordinary expenses) at no more than an annual rate of 0.90% for all classes of shares. Under this same arrangement, the Global Growth Fund has also agreed, during the two year period following the year of any such waiver or reimbursement by the Adviser, to repay such amount, but only to the extent the Global Growth Fund’s adjusted Total Annual Fund Operating Expenses would not exceed an annual rate of 0.90% for the applicable class of shares, after giving effect to the repayments. This arrangement is in effect through April 30, 2024, and may be terminated only by the Board of Directors of the Corporation (the “Board”) before such time. The Global Growth Fund will carry forward any fees and expenses in excess of the expense limitation and repay the Adviser such amount provided the Global Growth Fund is able to do so without exceeding the lesser of (1) the expense limit in effect at the time of the waiver or reimbursement, as applicable, or (2) the expense limit in effect at the time of recoupment after giving effect to the repayment.
[3] The Adviser has contractually agreed to waive its investment advisory fees and/or to reimburse expenses of the International Small Cap Fund to the extent necessary to maintain the Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement (excluding brokerage costs, acquired fund fees and expenses, interest, taxes, and extraordinary expenses) at no more than an annual rate of 0.90% for all classes of shares. Under this same arrangement, the International Small Cap Fund has also agreed, during the two year period following the year of any such waiver or reimbursement by the Adviser, to repay such amount, but only to the extent the International Small Cap Fund’s adjusted Total Annual Fund Operating Expenses would not exceed an annual rate of 0.90% for the applicable class of shares, after giving effect to the repayments. This arrangement is in effect through April 30, 2024, and may be terminated only by the Board of Directors of the Corporation (the “Board”) before such time. The International Small Cap Fund will carry forward any fees and expenses in excess of the expense limitation and repay the Adviser such amount provided the International Small Cap Fund is able to do so without exceeding the lesser of (1) the expense limit in effect at the time of the waiver or reimbursement, as applicable, or (2) the expense limit in effect at the time of recoupment after giving effect to the repayment.
[4] The Adviser has contractually agreed to waive its investment advisory fees and/or to reimburse expenses of the GRID Fund to the extent necessary to maintain the Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement (excluding brokerage costs, acquired fund fees and expenses, interest, taxes, and extraordinary expenses) at no more than an annual rate of 0.90% for all classes of shares. Under this same arrangement, the GRID Fund has also agreed, during the two year period following the year of any such waiver or reimbursement by the Adviser, to repay such amount, but only to the extent the GRID Fund’s adjusted Total Annual Fund Operating Expenses would not exceed an annual rate of 0.90% for the applicable class of shares, after giving effect to the repayments. This arrangement is in effect through April 30, 2024, and may be terminated only by the Board of Directors of the Corporation (the “Board”) before such time. The GRID Fund will carry forward any fees and expenses in excess of the expense limitation and repay the Adviser such amount provided the GRID Fund is able to do so without exceeding the lesser of (1) the expense limit in effect at the time of the waiver or reimbursement, as applicable, or (2) the expense limit in effect at the time of recoupment after giving effect to the repayment.
[5] The Adviser has contractually agreed to waive its investment advisory fees and/or to reimburse expenses of the Global Mini Mites Fund to the extent necessary to maintain the Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement (excluding brokerage costs, acquired fund fees and expenses, interest, taxes, and extraordinary expenses) at no more than an annual rate of 0.90% for all classes of shares. Under this same arrangement, the Global Mini Mites Fund has also agreed, during the two year period following the year of any such waiver or reimbursement by the Adviser, to repay such amount, but only to the extent the Global Mini Mites Fund’s adjusted Total Annual Fund Operating Expenses would not exceed an annual rate of 0.90% for the applicable class of shares, after giving effect to the repayments. This arrangement is in effect through April 30, 2024, and may be terminated only by the Board of Directors of the Corporation before such time. The Global Mini Mites Fund will carry forward, for a period not to exceed two years from the date that an amount is waived, any fees and expenses in excess of the expense limitation and repay the Adviser such amount provided the Global Mini Mites Fund is able to do so without exceeding the lesser of (1) the expense limit in effect at the time of the waiver or reimbursement, as applicable, or (2) the expense limit in effect at the time of recoupment after giving effect to the repayment.