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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Aug. 31, 2019
Entity Registrant Name dei_EntityRegistrantName RBB FUND, INC.
Entity Central Index Key dei_EntityCentralIndexKey 0000831114
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Dec. 20, 2019
Document Effective Date dei_DocumentEffectiveDate Dec. 31, 2019
Prospectus Date rr_ProspectusDate Dec. 31, 2019
Schneider | SCHNEIDER SMALL CAP VALUE FUND  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY SECTION
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Schneider Small Cap Value Fund (the "Fund") seeks long-term capital growth by investing primarily in common stocks of companies that have capitalizations that are less than the largest company in the Russell 2000® Index ("small cap companies") and which Schneider Capital Management Company (the "Adviser") believes are undervalued. There can be no guarantee that the Fund will achieve its investment objective.
Expense [Heading] rr_ExpenseHeading Expenses and Fees
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the 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.
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 December 31, 2020
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 transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the Example, affect the Fund's performance. Portfolio turnover may vary from year to year, as well as within a year. During the most recent fiscal year, the Fund's portfolio turnover rate was 66% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 66.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions 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.
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 operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal circumstances, at least 80% of the Fund's net assets (including borrowings for investment purposes) will be invested in small cap companies. For this purpose, small cap companies are defined as companies whose market capitalization at the time of purchase is within the market capitalization range represented by companies in the Russell 2000® Index. As of November 30, 2019, the median market capitalization of this index was $786 million and the largest stock was $9.1 billion. Please note that this data is as of a particular point in time and is subject to change. The Fund invests primarily in common stock of companies the Adviser believes are undervalued. The Fund may invest in convertible securities without regard to their credit ratings. The Fund may also invest up to 20% of the value of its net assets in securities of foreign issuers, including American Depositary Receipts ("ADRs"). While it will not concentrate its investments in any one industry, the Fund may from time to time have significant exposure in one or more sectors of the economy, such as the oil and gas sector. The Fund may also seek to increase its income by lending portfolio securities.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The Fund's principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. Different risks may be more significant at different times depending on market conditions or other factors.

 

■    Common Stock Risk. The Fund invests in common stocks, which are subject to market, economic and business risks that will cause their prices to fluctuate over time. Therefore, the value of your investment in the Fund may go up and down, sometimes rapidly and unpredictably, and you could lose money. The value of securities convertible into equity securities, such as warrants or convertible debt, is also affected by prevailing interest rates, the credit quality of the issuer, and any call provision.

 

■    Cyber Security Risk. Cyber security risk is the risk of an unauthorized breach and access to Fund assets, Fund or customer data (including private shareholder information), or proprietary information, or the risk of an incident occurring that causes the Fund, the investment adviser, custodian, transfer agent, distributor and other service providers and financial intermediaries to suffer data breaches, data corruption or lose operational functionality or prevent Fund investors from purchasing, redeeming or exchanging shares or receiving distributions. The Fund and its investment adviser have limited ability to prevent or mitigate cyber security incidents affecting third-party service providers. Successful cyber-attacks or other cyber-failures or events affecting the Fund or its service providers may adversely impact and cause financial losses to the Fund or its shareholders.

 

■    Foreign Securities Risk. Investing in foreign securities poses additional market risks since political and economic events unique in a country or region will affect those markets and their issuers and may not affect the U.S. economy or U.S. issuers. In addition, investments in foreign securities are generally denominated in foreign currency. As a result, changes in the value of those currencies compared to the U.S. dollar may affect the value of the Fund's investments.

 

■    Portfolio Turnover Risk. The Fund may frequently buy and sell portfolio securities and other assets to rebalance the Fund's exposure to various market sectors. Higher portfolio turnover may result in the Fund paying higher levels of transaction costs and generating greater tax liabilities for shareholders. Portfolio turnover risk may cause the Fund's performance to be less than you expect. A portfolio turnover rate greater than 100% is considered to be high.

 

■    Sector Risk. The Fund may focus its investments from time to time in one or more sectors of the economy, such as the oil and gas sector. To the extent that it does so, developments affecting companies in that sector or sectors will likely have a magnified effect on the Fund's net asset value and total return. The profitability of companies in the oil and gas sector is related to worldwide energy prices, exploration, and production spending. Exploration for, and production of, oil and gas is an uncertain process with many risks. The risks and hazards that are inherent in the oil and gas sector may cause the price of commodities to widely fluctuate, which may have a negative effect on oil and gas companies and the companies that service them.

 

■    Securities Lending Risk. There are certain risks associated with securities lending, including the risk that when lending portfolio securities, the securities may not be available to the Fund on a timely basis and the Fund may, therefore, lose the opportunity to sell the securities at a desirable price.

 

■    Small Cap Risk. Stocks of small companies may be more volatile than, and not as readily marketable as, those of larger companies. Small companies may also have limited product lines, markets or financial resources and may be dependent on relatively small or inexperienced management groups. Additionally, the trading volume of small company securities may make them more difficult to sell than those of larger companies. Moreover, the lack of an efficient market for the securities may make them difficult to value.

 

■    Value Stock Risk. Value investing involves the risk that the Fund's investment in companies whose securities are believed to be undervalued, relative to their underlying profitability, will not appreciate in value as anticipated. Because different types of stocks go out of favor with investors depending on market and economic conditions, the Fund may be adversely affected during a market downturn and when value stocks are out of favor.
Risk Lose Money [Text] rr_RiskLoseMoney You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Risk/Return Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The chart below illustrates the long-term performance of the Fund. The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. The chart assumes reinvestment of dividends and distributions. As with all such investments, past performance is not an indication of future results. Performance reflects fee waivers in effect. If fee waivers were not in place, the Fund's performance would be reduced. Updated performance information is available at www.schneidercap.com or by calling 1-888-520-3277.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-520-3277
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.schneidercap.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all such investments, past performance is not an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Total Returns for the Calendar Years Ended December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best and Worst Quarterly Performance (for the periods reflected in the chart above):

 

Best Quarter: 39.11% (Qtr. ended June 30, 2009)
Worst Quarter: -36.69% (Qtr. ended December 31, 2018)
Year-to-date total return for the nine months ended September 30, 2019: 0.86%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for the Periods Ended December 31, 2018
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 ("IRA").
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

The following table compares the Fund's average annual total returns for the past calendar year, past five calendar years, past ten calendar years and since inception to the average annual total returns of a broad-based securities market index for the same periods. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

In cases in the chart above where the Fund's average annual return after taxes on distributions and sale of fund shares for a particular period is higher than the Fund's average annual return after taxes on distributions for the same period, this is due to realized losses that would have been sustained upon the sale of fund shares immediately after the relevant period. The calculations assume that an investor held the shares in a taxable account, was in the actual historical highest individual federal marginal income tax bracket for each year and would have been able to immediately utilize the full realized loss to reduce his or her federal tax liability. However, actual individual tax results may vary and investors should consult their tax advisers regarding their personal tax situations.
Schneider | SCHNEIDER SMALL CAP VALUE FUND | SCHNEIDER SMALL CAP VALUE FUND SHARES  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SCMVX
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee rr_ExchangeFee none
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.74%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.74%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.59%) [1]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.15%
One Year rr_ExpenseExampleYear01 $ 117
Three Years rr_ExpenseExampleYear03 490
Five Years rr_ExpenseExampleYear05 888
Ten Years rr_ExpenseExampleYear10 $ 2,003
Annual Return 2009 rr_AnnualReturn2009 54.04%
Annual Return 2010 rr_AnnualReturn2010 32.24%
Annual Return 2011 rr_AnnualReturn2011 (23.99%)
Annual Return 2012 rr_AnnualReturn2012 35.35%
Annual Return 2013 rr_AnnualReturn2013 32.09%
Annual Return 2014 rr_AnnualReturn2014 (11.75%)
Annual Return 2015 rr_AnnualReturn2015 (22.53%)
Annual Return 2016 rr_AnnualReturn2016 58.51%
Annual Return 2017 rr_AnnualReturn2017 12.25%
Annual Return 2018 rr_AnnualReturn2018 (32.55%)
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.86%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 39.11%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (36.69%)
1 Year rr_AverageAnnualReturnYear01 (32.55%)
5 Years rr_AverageAnnualReturnYear05 (3.88%)
10 Years rr_AverageAnnualReturnYear10 8.55%
Since Inception rr_AverageAnnualReturnSinceInception 10.54% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 02, 1998
Schneider | SCHNEIDER SMALL CAP VALUE FUND | Russell 2000® Value Index (reflects no deductions of fees, expenses and taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (12.86%)
5 Years rr_AverageAnnualReturnYear05 3.61%
10 Years rr_AverageAnnualReturnYear10 10.40%
Since Inception rr_AverageAnnualReturnSinceInception 8.70% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 02, 1998
Schneider | SCHNEIDER SMALL CAP VALUE FUND | After Taxes on Distributions | SCHNEIDER SMALL CAP VALUE FUND SHARES  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (37.32%) [3]
5 Years rr_AverageAnnualReturnYear05 (8.11%) [3]
10 Years rr_AverageAnnualReturnYear10 5.64% [3]
Since Inception rr_AverageAnnualReturnSinceInception 7.40% [2],[3]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 02, 1998 [3]
Schneider | SCHNEIDER SMALL CAP VALUE FUND | After Taxes on Distributions and Sales | SCHNEIDER SMALL CAP VALUE FUND SHARES  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (18.00%) [3]
5 Years rr_AverageAnnualReturnYear05 (3.54%) [3]
10 Years rr_AverageAnnualReturnYear10 6.52% [3]
Since Inception rr_AverageAnnualReturnSinceInception 8.38% [2],[3]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 02, 1998 [3]
[1] The Adviser has contractually agreed to waive management fees and reimburse expenses to the extent that Total Annual Fund Operating Expenses (excluding certain items discussed below) exceed 1.15%. In determining the Adviser's obligation to waive advisory fees and/or reimburse expenses, the following expenses are not taken into account and could cause net Total Annual Fund Operating Expenses to exceed 1.15%: acquired fund fees and expenses, brokerage commissions, extraordinary items, interest and taxes. This contractual limitation is in effect until December 31, 2020 and may not be terminated without the approval of the Board of Directors of The RBB Fund, Inc. If at any time the Fund's Total Annual Fund Operating Expenses (not including acquired fund fees and expenses, brokerage commissions, extraordinary items, interest or taxes) for a year are less than 1.15%, the Adviser may recoup any waived or reimbursed amounts from the Fund within three years from the date on which such waiver or reimbursement was made by the Adviser, provided such reimbursement does not cause the Fund to exceed the expense limitations that were in effect at the time of the waiver or reimbursement.
[2] Commenced operations on September 2, 1998.
[3] 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. 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 ("IRA").