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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Royce Special Equity Multi-Cap Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Royce Special Equity Multi-Cap Fund’s investment goal is long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock


The following table presents the fees and expenses that you may pay if you buy and hold shares of the Fund.

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 2015-04-30
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock


The 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 Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 44% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.00%
Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s total operating expenses (net of fee waivers and/or expense reimbursements in year one) remain the same. Although your actual costs may be higher or lower, based on the assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Royce & Associates, LLC (“Royce”), the Fund’s investment adviser, invests the Fund’s assets primarily in equity securities. The portfolio manager applies an intensive value approach in managing the Fund’s assets. This approach, which attempts to combine classic value analysis, the identification of good businesses, and accounting cynicism, has its roots in the teachings of Benjamin Graham and Abraham Briloff.

    Normally, the Fund invests at least 80% of its net assets in equity securities. Although the Fund may invest in the equity securities of companies of any stock market capitalization, Royce expects that a significant portion of the Fund’s assets may be invested in the equity securities of mid- and larger-cap companies with stock market capitalizations of more than $5 billion. Although the Fund normally focuses on the securities of U.S. companies, it may invest up to 25% of its net assets (measured at the time of investment) in securities of companies headquartered in foreign countries. The Fund may sell securities to, among other things, secure gains, limit losses, redeploy assets into what Royce deems to be more appropriate opportunities and/or manage cash levels in the Fund’s portfolio.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Normally, the Fund invests at least 80% of its net assets in equity securities. Although the Fund may invest in the equity securities of companies of any stock market capitalization, Royce expects that a significant portion of the Fund's assets may be invested in the equity securities of mid- and larger-cap companies with stock market capitalizations of more than $5 billion. Although the Fund normally focuses on the securities of U.S. companies, it may invest up to 25% of its net assets (measured at the time of investment) in securities of companies headquartered in foreign countries. The Fund may sell securities to, among other things, secure gains, limit losses, redeploy assets into what Royce deems to be more appropriate opportunities and/or manage cash levels in the Fund's portfolio.
Risk [Heading] rr_RiskHeading Primary Risks for Fund Investors
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with any mutual fund that invests in common stocks, Royce Special Equity Multi-Cap Fund is subject to market risk—the possibility that common stock prices will decline over short or extended periods of time. As a result, the value of an investment in the Fund will fluctuate, sometimes sharply and unpredictably, and you could lose money over short or long periods of time.

    The prices of mid-cap securities are generally more volatile and their markets are less liquid relative to larger-cap securities. Therefore, the Fund may involve considerably more risk of loss and its returns may differ significantly from funds investing exclusively in larger-cap companies or other asset classes. In addition, as of December 31, 2013 the Fund held less than 50 portfolio securities. The Fund’s investment in a limited number of issuers and its potential industry and sector overweights may involve more risk to investors than a more diversified portfolio of securities because it may be more susceptible to any single corporate, economic, political, regulatory, or market event.

    Investment in foreign securities involves risks that may not be encountered in U.S. investments, including adverse political, social, economic, or other developments that are unique to a particular region or country. Prices of foreign securities in particular countries or regions may, at times, move in a different direction and/or be more volatile than those of U.S. securities. Because the Fund does not intend to hedge its foreign currency exposure, the U.S. dollar value of the Fund’s investments may be harmed by declines in the value of foreign currencies in relation to the U.S. dollar.

    The Fund’s intensive value approach may not be successful and could result in portfolio losses.

    Investments in the Fund are not bank deposits and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney As with any mutual fund that invests in common stocks, Royce Special Equity Multi-Cap Fund is subject to market risk-the possibility that common stock prices will decline over short or extended periods of time. As a result, the value of an investment in the Fund will fluctuate, sometimes sharply and unpredictably, and you could lose money over short or long periods of time.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Investments in the Fund are not bank deposits and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides an indication of the risks of investing in the Fund. Past performance does not indicate how the Fund will perform in the future. The Calendar Year Total Returns chart shows performance year by year since the Fund’s inception (Service Class used for illustrative purposes—returns differ by class). The Annualized Total Returns table shows how the Fund’s average annual total returns for various periods compare with those of the Russell 1000 Index, the Fund’s benchmark index. Because the Consultant Class’s inception date is after December 31, 2013, performance information is for Service Class shares, not offered in this Prospectus. The returns will differ only to the extent that the Classes have different expenses because all Classes invest in the same portfolio of securities. The Consultant Class has higher expenses than the Service Class. If Consultant Class expenses had been reflected, total returns would have been lower.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides an indication of the risks of investing in the Fund. The Calendar Year Total Returns chart shows performance year by year since the Fund's inception (Service Class used for illustrative purposes-returns differ by class).
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Annualized Total Returns table shows how the Fund's average annual total returns for various periods compare with those of the Russell 1000 Index, the Fund's benchmark index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 221-4268
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.roycefunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance does not indicate how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading CALENDAR YEAR TOTAL RETURNS in Percentages (%) Service Class
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period shown in the bar chart, the highest return for a calendar quarter was 12.12% (quarter ended 3/31/12) and the lowest return for a calendar quarter was -9.94% (quarter ended 9/30/11).
Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus Because the Consultant Class's inception date is after December 31, 2013, performance information is for Service Class shares, not offered in this Prospectus.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.12%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (9.94%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (Reflects no deductions for fees, expenses, or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate we assumed that the shareholder was in the highest federal income tax bracket in effect at the time of each distribution of income or capital gains. We did not consider the impact of state or local income taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your after-tax returns depend on your tax situation, so they may differ from the returns shown. This information does not apply if your investment is in an individual retirement account (IRA), a 401(k) plan, or is otherwise tax deferred because such accounts are subject to income taxes only upon distribution.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
    The table also presents the impact of taxes on the Fund’s returns. (Service Class again used for illustrative purposes). In calculating these figures, we assumed that the shareholder was in the highest federal income tax bracket in effect at the time of each distribution of income or capital gains. We did not consider the impact of state or local income taxes. Your after-tax returns depend on your tax situation, so they may differ from the returns shown. This information does not apply if your investment is in an individual retirement account (IRA), a 401(k) plan, or is otherwise tax deferred because such accounts are subject to income taxes only upon distribution. Current month-end performance information may be obtained at www.roycefunds.com or by calling Investor Services at (800) 221-4268.
Caption rr_AverageAnnualReturnCaption ANNUALIZED TOTAL RETURNS (12/31/13)
Russell 1000 Index (Reflects no deductions for fees, expenses, or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 33.11%
Since Inception rr_AverageAnnualReturnSinceInception 16.30%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2010
Consultant Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum deferred sales charge on purchases held for less than 365 days rr_MaximumCumulativeSalesChargeOverOther 1.00%
Maximum sales charge (load) imposed on purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Management fees rr_ManagementFeesOverAssets 0.85%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.16%
Total annual Fund operating expenses rr_ExpensesOverAssets 2.01%
Fee waivers and/or expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.02%) [1]
Total annual Fund operating expenses after fee waivers and/or expense reimbursements rr_NetExpensesOverAssets 1.99%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 202
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 629
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,081
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,336
Service Class
  
Risk/Return: rr_RiskReturnAbstract  
Annual Return 2011 rr_AnnualReturn2011 7.20%
Annual Return 2012 rr_AnnualReturn2012 11.60%
Annual Return 2013 rr_AnnualReturn2013 36.30%
1 Year rr_AverageAnnualReturnYear01 36.26%
Since Inception rr_AverageAnnualReturnSinceInception 17.70%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2010
Service Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 34.31%
Since Inception rr_AverageAnnualReturnSinceInception 16.99%
Service Class | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.05%
Since Inception rr_AverageAnnualReturnSinceInception 13.97%
[1] Royce has contractually agreed, without right of termination, to waive fees and/or reimburse expenses to the extent necessary to maintain the Consultant Class's net annual operating expenses (excluding brokerage commissions, taxes, interest, litigation expenses, acquired fund fees and expenses, and other expenses not borne in the ordinary course of business) at or below 1.99% through April 30, 2015.