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Summit Global Investments Small Cap Low Volatility Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Summit Global Investments Small Cap Low Volatility Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Summit Global Investments Small Cap Low Volatility Fund (the "Fund") seeks to outperform the Russell 2000® Index over a market cycle while reducing overall volatility. 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 and hold shares of the Fund.
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 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 Dec. 31, 2017
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.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates "Other Expenses" are based on estimated amounts 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 the Retail Shares or Class C Shares or $1,000,000 in the Class I Shares of the Fund and 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, the Fund will invest at least 80% of its net assets (including borrowings for investment purposes) in equity securities, primarily common stocks of U.S. issuers with small market capitalizations. A small market capitalization issuer generally is considered to be one whose market capitalization is, at the time the Fund makes the investment, similar to the market capitalization of companies in the Russell 2000® Index. The Russell 2000® Index is a small cap stock market index measuring the performance of approximately 2,000 small cap U.S. companies. As of February 29, 2016, the median market capitalization of this index was $621 million and the largest stock was $5.5 billion. The Fund's investments will generally consist of securities, which may include common stocks, preferred stocks, warrants to acquire common stock, and securities convertible into common stock. The Fund purchases equity securities traded in the U.S. on registered exchanges or the over-the-counter market.


The Adviser attempts to lower the Fund's market risk by investing in U.S. equity securities that lower the overall volatility of the Fund's portfolio as compared to the Russell 2000® Index. Volatility is a statistical measurement of the magnitude of up and down fluctuations in the value of a financial instrument or index. The Fund invests in stocks that exhibit less volatile stock price patterns, strengthening business metrics (i.e., earnings, debt, return on assets, competition, customers, industry, etc.) and quantitative factors such as earnings variability, leverage, volatility, price/book, price/cash flow, etc. The Adviser selects securities for the Fund that it anticipates will produce less volatility with more protection against significant losses and more consistent returns. While the Adviser attempts to manage the Fund's volatility, there is no guarantee that the strategy will be successful or that the Fund's portfolio will not experience periods of volatility.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Loss of money is a risk of investing in the Fund. In addition, your investment in the Fund may be subject to the following principal risks:


n  Common Stock Risk. Investments in common stocks are subject to market, economic and business risks that will cause their price to fluctuate over time. Therefore, an investment in the Fund may be more suitable for long-term investors who can bear the risk of these fluctuations.


n  Convertible Securities Risk. Securities that can be converted into common stock, such as certain securities and preferred stock, are subject to the usual risks associated with fixed income investments, such as interest rate risk and credit risk. In addition, because they react to changes in the value of the equity securities into which they will convert, convertible securities are also subject to the risks associated with equity securities


n  High Portfolio Turnover Risk. The risk that when investing on a shorter-term basis, the Fund may as a result trade more frequently and incur higher levels of brokerage fees and commissions and cause higher levels of current tax liability to shareholders of the Fund.


n  Low Volatility Risk. Although subject to the risks of common stocks, low volatility stocks are seen as having a lower risk profile than the overall markets. However, a portfolio comprised of low volatility stocks may not produce investment exposure that has lower variability to changes in such stocks' price levels. Investing in low volatility stocks may limit the Fund's gains in rising markets.


n  Management Risk. The Fund is subject to the risk of poor stock selection. In other words, the individual stocks in the Fund may not perform as well as expected, and/or the Fund's portfolio management practices do not work to achieve their desired result.


n  Market Risk. The net asset value ("NAV") of the Fund will change with changes in the market value of its portfolio positions. Investors may lose money. Although the Fund will invest in stocks the Adviser believes will produce less volatility, there is no guarantee that the stocks will perform as expected.


n  New Fund Risk. As a new Fund, there can be no assurance that the Fund will grow to or maintain economically viable size. In addition, the Fund has a limited operating history upon which prospective investors can evaluate its performance.


n  Opportunity Risk. As with all mutual funds, the Fund is subject to the risk of missing out on an opportunity because the assets necessary to take advantage of it are tied up in less advantageous investments.


n  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.


n  Warrants Risk. The purchase of warrants involves the risk that the Fund could lose the purchase value of a warrant if the right to subscribe to additional shares is not executed prior to the warrant's expiration. Also, the purchase of warrants involves the risk that the effective price paid for the warrant added to the subscription price of the related security may exceed the value of the subscribed security's market price such as when there is no movement in the level of the underlying security.
Risk Lose Money [Text] rr_RiskLoseMoney Loss of money is a risk of investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Because the Fund has less than one full calendar year of performance, no performance information has been included.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Because the Fund has less than one full calendar year of performance, no performance information has been included.
Summit Global Investments Small Cap Low Volatility Fund | Class I  
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) rr_RedemptionFeeOverRedemption (1.50%)
Exchange Fee (as a percentage of amount exchanged on shares held for less than 60 days, if applicable) rr_ExchangeFeeOverRedemption 1.50%
Management Fees rr_ManagementFeesOverAssets 0.95%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.50% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.45%
Less Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [2]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.23%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 12,532
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 43,703
Summit Global Investments Small Cap Low Volatility Fund | Retail Class  
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) rr_RedemptionFeeOverRedemption (1.50%)
Exchange Fee (as a percentage of amount exchanged on shares held for less than 60 days, if applicable) rr_ExchangeFeeOverRedemption 1.50%
Management Fees rr_ManagementFeesOverAssets 0.95%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.50% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.70%
Less Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [2]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 151
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 514
Summit Global Investments Small Cap Low Volatility Fund | Class C  
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) rr_RedemptionFeeOverRedemption (1.50%)
Exchange Fee (as a percentage of amount exchanged on shares held for less than 60 days, if applicable) rr_ExchangeFeeOverRedemption 1.50%
Management Fees rr_ManagementFeesOverAssets 0.95%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.50% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.45%
Less Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [2]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 2.23%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 226
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 743
[1] "Other Expenses" are based on estimated amounts for the current fiscal year.
[2] Summit Global Investments, LLC (the "Adviser"), the Fund's investment adviser, has contractually agreed to waive management fees and reimburse expenses through December 31, 2017 to the extent that Total Annual Fund Operating Expenses (excluding certain items discussed below) exceed 1.23%, 1.48% and 2.23% of the Fund's average daily net assets attributable to Class I Shares, Retail 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 1.23%, 1.48% or 2.23%, as applicable: acquired fund fees and expenses, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation may not be terminated before December 31, 2017 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 for that year are less than 1.23%, 1.48% and 2.23% of the Fund's average daily net assets attributable to Class I Shares, Retail Class Shares and Class C Shares, respectively, the Adviser is entitled to reimbursement by the Fund of the advisory fees forgone and other payments remitted by the Adviser to the Fund within three years from the date on which such waiver or reimbursement was made.