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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, 2021
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 Feb. 11, 2022
Document Effective Date dei_DocumentEffectiveDate Feb. 11, 2022
Prospectus Date rr_ProspectusDate Dec. 31, 2021
DriveWealth Power Saver ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Expense [Heading] rr_ExpenseHeading Fees and Expenses:
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 (“Shares”). This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Fund Shares.
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, 2022
Acquired Fund Fees and Expenses, Based on Estimates [Text] rr_AcquiredFundFeesAndExpensesBasedOnEstimates Acquired Fund Fees and Expenses” 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, and are estimated 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 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: (1) your investment has a 5% return each year, and (2) the Fund’s operating expenses remain the same (taking into account the contractual expense limitation in effect through December 31, 2022). Although your actual costs may be higher or lower, based on these assumptions your costs would be:
DriveWealth Power Saver ETF | DriveWealth Power Saver ETF Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EERN
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets none
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 1.77% [1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.62%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.48%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 2.14% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 217
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 769
DriveWealth Steady Saver ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Expense [Heading] rr_ExpenseHeading Fees and Expenses:
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 (“Shares”). This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Fund Shares.
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, 2022
Acquired Fund Fees and Expenses, Based on Estimates [Text] rr_AcquiredFundFeesAndExpensesBasedOnEstimates Acquired Fund Fees and Expenses” 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, and are estimated 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 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: (1) your investment has a 5% return each year, and (2) the Fund’s operating expenses remain the same (taking into account the contractual expense limitation in effect through December 31, 2022). Although your actual costs may be higher or lower, based on these assumptions your costs would be:
DriveWealth Steady Saver ETF | DriveWealth Steady Saver ETF Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol STBL
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.59%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets none
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.41% [3]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.00%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.20%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 298
[1] “Acquired Fund Fees and Expenses” 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, and are estimated for the current fiscal year.
[2] The Fund’s investment adviser, Red Gate Advisers, LLC (the “Adviser”) has contractually agreed to pay, waive or absorb a portion of the Fund’s expenses through the end of December 31, 2022, or such later date as may be determined by the Fund and the Adviser, to the extent necessary to limit operating expenses (excluding brokerage commissions, taxes, interest expense, acquired fund fees and expenses, and any extraordinary expenses) to an amount not to exceed 0.37% annually of average daily net assets of the Fund. If the excluded expenses are incurred, operating expenses may be higher than 0.37%. The Adviser may recover from the Fund fees and expenses previously paid, waived or absorbed for a period of three years after such fees or expenses were incurred, provided that the repayments do not cause operating expenses (excluding brokerage commissions, taxes, interest expense, acquired fund fees and expenses, and any extraordinary expenses) to exceed 0.37% annually of the Fund’s average daily net assets or, if less, the expense limitation that was in place at the time the fees or expenses were paid, waived or absorbed. The expense limitation agreement will terminate automatically if the Adviser is no longer serving as investment adviser to the Fund, but otherwise it can be terminated only by the Board of Directors (the “Board”) of The RBB Fund, Inc. (the “Company”).
[3] “Acquired Fund Fees and Expenses” 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, and are estimated for the current fiscal year.
[4] The Fund’s investment adviser, Red Gate Advisers, LLC (the “Adviser”) has contractually agreed to pay, waive or absorb a portion of the Fund’s expenses through the end of December 31, 2022, or such later date as may be determined by the Fund and the Adviser, to the extent necessary to limit operating expenses (excluding brokerage commissions, taxes, interest expense, acquired fund fees and expenses, and any extraordinary expenses) to an amount not to exceed 0.39% annually of average daily net assets of the Fund. If the excluded expenses are incurred, operating expenses may be higher than 0.39%. The Adviser may recover from the Fund fees and expenses previously paid, waived or absorbed for a period of three years after such fees or expenses were incurred, provided that the repayments do not cause operating expenses (excluding brokerage commissions, taxes, interest expense, acquired fund fees and expenses, and any extraordinary expenses) to exceed 0.39% annually of the Fund’s average daily net assets or, if less, the expense limitation that was in place at the time the fees or expenses were paid, waived or absorbed. The expense limitation agreement will terminate automatically if the Adviser is no longer serving as investment adviser to the Fund, but otherwise it can be terminated only by the Board of Directors (the “Board”) of The RBB Fund, Inc. (the “Company”).