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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
Bogle | Bogle Investment Management Small Cap Growth Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY SECTION
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the Bogle Investment Management Small Cap Growth Fund (the "Fund") is to provide long-term capital appreciation.
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 transaction 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 344% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 344.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
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 below shows what you would pay if you invested $10,000 in the Fund over the various time periods indicated and then redeemed all of your shares at the end of those periods. The Example assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same (taking into account the contractual expense limitation for the first year). 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

The Fund seeks to achieve its objective by investing under normal circumstances at least 80% of the net assets of the portfolio (including borrowings for investment purposes) in the stocks of U.S. companies with market capitalizations, at the time of purchase, that are within the trailing twelve-month range of the market capitalizations of those companies that are included in the Russell 2000® Index ("Small Cap Stocks"). For purposes of this investment policy, stocks of U.S. companies are stocks that are listed on a securities exchange or market inside the United States. Because the Russell 2000® Index ("Index") is modified ("reconstituted") regularly (usually each year) to replace companies that no longer qualify for inclusion in the Index due to, among other reasons, having market capitalizations that have grown too large, the Adviser uses the trailing twelve-month range of market capitalizations to mitigate the need to trade stocks in the portfolio due to Index reconstitution. Further, the Adviser will not sell from the portfolio any holdings that the Adviser believes are likely to appreciate more than the Index solely because the market capitalizations of such holdings cause the portfolio to hold less than 80% of its net assets within this range. As such, the Fund may, from time to time, hold less than 80% of its net assets within this range. The Fund attempts to achieve its objective by taking long positions in Small Cap Stocks that the Adviser believes are undervalued given their future earnings growth prospects. As part of its investment strategy, the Adviser will continue to invest in Small Cap Stocks that the Adviser believes will appreciate more than the Index. Shareholders will be notified by the Fund sixty days in advance of any change in this 80% policy.
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.

 

● 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.

 

● Equity Stock Risk. Common stocks may decline over short or even extended periods of time. Equity markets tend to be cyclical; there are times when stock prices generally increase, and other times when they generally decrease. Therefore, you could lose money by investing in the Fund.

 

● Growth Stock Risk. Growth stocks are typically priced higher than other stocks, in relation to earnings and other measures, because investors believe they have more growth potential. This potential may or may not be realized and, if it is not realized, may result in a loss to the Fund. Growth stock prices also tend to be more volatile than the overall market. Because different types of stocks go out of favor with investors depending on market and economic conditions, the Fund's return may be adversely affected during a market downturn and when growth stocks are out of favor.

 

● Market Risk. The net asset value ("NAV") of the Fund will fluctuate with changes in the market value of the Fund's portfolio holdings.

 

● Portfolio Turnover Risk. The Fund may frequently trade its portfolio holdings. High portfolio turnover will cause the Fund to incur higher brokerage commissions and other transaction costs, which could lower the Fund's performance. In addition to lower performance, high portfolio turnover could result in higher taxable capital gains. A portfolio turnover rate of 100% is considered to be high.

 

● Small Cap Risk. The Fund will invest in Small Cap Stocks that may be more volatile than investments in issuers with larger market capitalizations. Issuers of Small Cap Stocks are not as diversified in their business activities as issuers with larger market capitalizations and are more susceptible to changes in the business cycle. 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. Although the Fund will invest in stocks that the Adviser believes to be undervalued, there is no guarantee that the prices of these stocks will not move even lower. Because different types of stocks go out of favor with investors depending on market and economic conditions, the Fund's return may be adversely affected during a market turndown 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 by illustrating the variability of the Fund's returns. The chart assumes reinvestment of dividends and distributions. As with all such investments, past performance (before and after taxes) 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 may be obtained at www.boglefunds.com or by calling 1-877-264-5346.
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 by illustrating the variability of the Fund's returns.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-877-264-5346
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.boglefunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all such investments, past performance (before and after taxes) 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: 33.34% (quarter ended June 30, 2009)
Worst Quarter: -24.81% (quarter ended December 31, 2018)
Year-to-date total return for the nine months ended September 30, 2019: 13.23%
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 Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the figure representing "Returns After Taxes on Distributions and Sale of Fund Shares" may be higher than the other return figures for the same period, since a higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

The following table below compares the Fund's average annual total returns for the past calendar year, the past five calendar years and the past ten calendar years 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 indicator of how the Fund will perform in the future.
Bogle | Bogle Investment Management Small Cap Growth Fund | Bogle Investment Management Small Cap Growth Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BOGIX
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 none
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 0.38% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.38%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.26%
One Year rr_ExpenseExampleYear01 $ 128
Three Years rr_ExpenseExampleYear03 425
Five Years rr_ExpenseExampleYear05 744
Ten Years rr_ExpenseExampleYear10 $ 1,647
Annual Return 2009 rr_AnnualReturn2009 45.90%
Annual Return 2010 rr_AnnualReturn2010 29.18%
Annual Return 2011 rr_AnnualReturn2011 (4.88%)
Annual Return 2012 rr_AnnualReturn2012 26.14%
Annual Return 2013 rr_AnnualReturn2013 46.87%
Annual Return 2014 rr_AnnualReturn2014 2.38%
Annual Return 2015 rr_AnnualReturn2015 (7.69%)
Annual Return 2016 rr_AnnualReturn2016 19.77%
Annual Return 2017 rr_AnnualReturn2017 17.07%
Annual Return 2018 rr_AnnualReturn2018 (16.00%)
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 13.23%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 33.34%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.81%)
1 Year rr_AverageAnnualReturnYear01 (16.00%)
5 Years rr_AverageAnnualReturnYear05 2.17%
10 Years rr_AverageAnnualReturnYear10 13.97%
Bogle | Bogle Investment Management Small Cap Growth Fund | Russell 2000® Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (11.01%)
5 Years rr_AverageAnnualReturnYear05 4.41%
10 Years rr_AverageAnnualReturnYear10 11.97%
Bogle | Bogle Investment Management Small Cap Growth Fund | After Taxes on Distributions | Bogle Investment Management Small Cap Growth Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (20.10%) [3]
5 Years rr_AverageAnnualReturnYear05 (1.22%) [3]
10 Years rr_AverageAnnualReturnYear10 12.06% [3]
Bogle | Bogle Investment Management Small Cap Growth Fund | After Taxes on Distributions and Sales | Bogle Investment Management Small Cap Growth Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (8.82%) [3]
5 Years rr_AverageAnnualReturnYear05 0.78% [3]
10 Years rr_AverageAnnualReturnYear10 11.22% [3]
[1] Other Expenses includes Acquired Fund Fees and Expenses, which are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the "Financial Highlights" section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
[2] Bogle Investment Management, L.P. (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 1.25% for the Fund. In determining the Adviser's obligation to waive advisory fees and/or reimburse expenses, the following expenses are not taken into account and certain of these expenses could cause net Total Annual Fund Operating Expenses to exceed 1.25%: acquired fund fees and expenses, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation is in effect until December 31, 2020 and may not be terminated without the approval of the Board of Directors (the "Board") of The RBB Fund, Inc. The Adviser may discontinue these arrangements any time after December 31, 2020. If at any time the Fund's total annual Fund operating expenses (not including acquired fund fees and expenses, brokerage commissions, extraordinary items, interest and taxes) for a year are less than 1.25%, 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.
[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). In certain cases, the figure representing "Returns After Taxes on Distributions and Sale of Fund Shares" may be higher than the other return figures for the same period, since a higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.