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Abbey Capital Futures Strategy Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000831114_SupplementTextBlock

Abbey Capital Futures Strategy Fund (the “Fund”)


a series of The RBB Fund, Inc.


Class I Shares (Ticker: ABYIX)


Class A Shares (Ticker: ABYAX)


Class C Shares (Ticker: ABYCX)


Supplement dated February 27, 2017
 to the Fund’s Summary Prospectus, Prospectus and Statement of Additional Information,


each dated December 31, 2016, as supplemented


THIS SUPPLEMENT CONTAINS NEW AND ADDITIONAL INFORMATION BEYOND THAT CONTAINED IN THE PROSPECTUS AND STATEMENT OF ADDITIONAL INFORMATION AND SHOULD BE READ IN CONJUNCTION WITH THE PROSPECTUS AND STATEMENT OF ADDITIONAL INFORMATION.


Effective as of February 28, 2017, Abbey Capital Limited, the investment adviser to the Fund (the “Adviser”), has contractually agreed to lower its investment advisory fee to 1.77% of the Fund’s average daily net assets. Correspondingly, also effective February 28, 2017, the Adviser has agreed to waive its advisory fee and/or reimburse expenses in order to limit Total Annual Fund Operating Expenses (excluding acquired fund fees and expenses, brokerage commissions, extraordinary items, interest or taxes) to 1.79%, 2.04% and 2.79% of the Fund’s average daily net assets attributable to Class I Shares, Class A Shares, and Class C Shares, respectively.  This contractual limitation is in effect until April 30, 2018, and may not be terminated without the approval of the Board of Directors of The RBB Fund, Inc.


Accordingly, the “Expenses and Fees” table and “Example” in the section entitled “SUMMARY SECTION — Expenses and Fees” on page 1 of the Prospectus and Summary Prospectus are hereby deleted and replaced with the following:
Risk/Return [Heading] rr_RiskReturnHeading Abbey Capital Futures Strategy Fund
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 and hold shares of the Fund (the “Shares”). You may qualify for sales charge discounts if you invest, or agree to invest in the future, at least $25,000 in Class A Shares. More information about these and other discounts is available from your financial professional, in the section of the Prospectus entitled “Shareholder Information — Sales Charges” and in the section of the Fund’s Statement of Additional Information (“SAI”) entitled “Purchase and Redemption Information — Reducing or Eliminating the Front-End Sales Charge.”
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Apr. 30, 2018
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Management Fees have been restated to reflect current fees.
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 $1,000,000 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:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock

Please retain this Supplement for future reference.
Abbey Capital Futures Strategy Fund | Class I Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOther 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
Management Fees rr_ManagementFeesOverAssets 1.77% [1],[2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Interest Expense rr_Component2OtherExpensesOverAssets 0.02%
Other Expenses rr_OtherExpensesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.97%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.16%) [3]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.81% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 18,389
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 60,287
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 104,762
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 228,293
Abbey Capital Futures Strategy Fund | Class A Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOther none [5]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 1.77% [1],[2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Interest Expense rr_Component2OtherExpensesOverAssets 0.02%
Other Expenses rr_OtherExpensesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.22%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.16%) [3]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 2.06% [4]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A Shares made within 12 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you invest, or agree to invest in the future, at least $25,000 in Class A Shares.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 770
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,214
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,682
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,973
Abbey Capital Futures Strategy Fund | Class C Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOther 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
Management Fees rr_ManagementFeesOverAssets 1.77% [1],[2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Interest Expense rr_Component2OtherExpensesOverAssets 0.02%
Other Expenses rr_OtherExpensesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.97%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.16%) [3]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 2.81% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 284
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 903
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,548
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,278
[1] Management Fees have been restated to reflect current fees.
[2] Management Fees include advisory fees paid to both Abbey Capital Limited (the "Adviser") and one or more trading advisers (the "Trading Advisers"). There are no performance fees charged by the Adviser or Trading Advisers either at the Fund or at the Fund's wholly-owned Subsidiary.
[3] 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 1.79%, 2.04%, and 2.79% of the Fund's average daily net assets attributable to Class I Shares, Class A 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 1.79%, 2.04%, or 2.79%, as applicable: acquired fund fees and expenses, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation is in effect until April 30, 2018 for Class I Shares, Class A Shares, and Class C Shares, 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 1.79%, 2.04%, and 2.79%, as applicable, 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 expense limitations that were in effect at the time of the waiver or reimbursement.
[4] Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements, excluding interest expenses are: Class I - 1.79%, Class A - 2.04%, Class C - 2.79%
[5] A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A Shares made within 12 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.