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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Aug. 31, 2020
Entity Registrant Name dei_EntityRegistrantName THE 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 Feb. 12, 2021
Document Effective Date dei_DocumentEffectiveDate Feb. 12, 2021
Prospectus Date rr_ProspectusDate Dec. 31, 2020
Campbell Systematic Macro Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

Effective as of February 16, 2021, Campbell & Company Investment Adviser LLC, the investment adviser to the Fund (the “Adviser”), has agreed to lower the maximum sales charge imposed on purchases of the Class A shares to 3.50%. Prior to February 16, 2021, the Fund’s maximum sales charge for Class A shares was 5.75%. All references in the Fund’s Prospectus are revised accordingly.

 

(i) In addition, the “Expenses and Fees” table and “Example” in the section entitled “Summary Section” are hereby deleted and replaced with the following:
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 (the "Shares"). 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 if you invest at least $25,000 in Class A Shares of the Fund. More Information about these discounts is available from your financial professional, in the section of this Prospectus entitled “Shareholder Information – Sales Charges” and in the Fund’s Statement of Additional Information (“SAI”) entitled “Purchase and Redemption Information – Reducing or Eliminating the Front End Sales Charge.” Financial Intermediaries may impose different sales charge waivers for Class A Shares, and these variations are described in the section of this Prospectus entitled “Shareholder – Information – Sales Charges”.
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, 2021
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you invest at least $25,000 in Class A Shares of the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
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.
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Accordingly, Other Expenses have been restated to reflect expenses for the current fiscal year.
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 Class A Shares and Class C Shares and $100,000 in Class I Shares 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:
Campbell Systematic Macro Fund | Class A Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.50%
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [1]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.64%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25% [2]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.47% [3]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.36%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.36%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 2.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 581
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 989
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,422
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,623
Campbell Systematic Macro Fund | Class I Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.64%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none [2]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.47% [3]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.11%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.36%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 1,778
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 6,262
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 11,009
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 24,130
Campbell Systematic Macro Fund | Class C Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [1]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.64%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00% [2]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.47% [3]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.11%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.36%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 2.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 378
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 926
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,599
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,395
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 278
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 926
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,599
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,395
[1] A contingent deferred sales charge (“CDSC”) of 1.00% is assessed on certain redemptions of Class A shares made within 12 months after a purchase of Class A shares where no initial sales charge was paid at the time of purchase as part of an investment of $250,000 or more. You should contact your financial intermediary to determine whether you are subject to the CDSC. A CDSC of 1.00% is assessed on redemptions of Class C shares made within twelve months after a purchase of Class C shares.
[2] The Fund has adopted a distribution plan for Class A shares and Class C shares pursuant to Rule 12b-1 (“Rule 12b-1 Plan”) under the Investment Company Act of 1940, as amended (the “1940 Act”) that permits payments of up to 0.25% as a percentage of average daily net assets of the Fund’s Class A shares and payments of up to 1.00% as a percentage of average daily net assets of the Fund’s Class C shares.
[3] Substantially all of the assets of the Equinox Campbell Strategy Fund, a series of Equinox Funds Trust (the “Predecessor Fund”), were transferred to the Fund in a tax-free reorganization that occurred on May 29, 2020, and the Predecessor Fund was reorganized into the Fund. Accordingly, Other Expenses have been restated to reflect expenses for the current fiscal year.
[4] Campbell & Company Investment Adviser LLC ("Campbell" or the "Adviser") has contractually agreed to waive its advisory fee and/or reimburse expenses in order to limit Total Annual Fund Operating Expenses (excluding certain items discussed below) to 2.00%, 1.75%, and 2.75% of the Fund's average daily net assets for Class A Shares, Class I Shares, and Class C Shares, respectively. 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 2.00%, 1.75%, and 2.75%, as applicable: acquired fund fees and expenses, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation is in effect until December 31, 2021 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 2.00%, 1.75%, and 2.75%, as applicable, the Adviser may recoup from the Fund any waived amount or other payments remitted by the Adviser within three years from the date on which such waiver or reimbursement was made, provided such reimbursement does not cause the Fund to exceed expense limitations that were in effect at the time of the waiver or reimbursement.