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Summit Global Investments Small Cap Low Volatility Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading

SUMMARY SECTION

 

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 (for this section only, 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. You may qualify for sales charge discounts on Class A Shares if you invest, or agree to invest in the future, at least $50,000 in the Fund. 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."
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 March 31, 2019
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. For the fiscal year ended August 31, 2017, the Fund's portfolio turnover rate was 95% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 95.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees 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. 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 assumes that you invest $10,000 in the Class A 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 November 30, 2016, the median market capitalization of this index was $780 million and the largest stock was $8.3 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.

 

The Fund may sell a stock if it no longer meets one or more investment criteria, including if the Adviser identifies fundamental, governance or legal risks or if the risk/return ranking declines due to increasing risk and/or decreasing return potential.
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:

 

• 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.

 

• 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

 

• 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. A portfolio turnover rate of 100% is considered to be high. For the fiscal period, the annual portfolio turnover rate of the Fund was lower than 100%, but the Fund's portfolio turnover rate is expected to vary from year to year. The Adviser may engage in active trading, and will not consider portfolio turnover a limiting factor in making decisions for the Fund.

 

• 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.

 

• 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.

 

• 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.

 

• 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.

 

• 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. Moreover, the lack of an efficient market for the securities may make them difficult to value.

 

• 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

The chart below illustrates the performance of the Fund's Class I Shares. The information shows the Fund's performance for one year and provides some indication of the risks of investing in the Fund. 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.summitglobalinvestments.com or by calling 1-855-744-8500.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information shows the Fund's performance for one year and provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-855-744-8500
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.summitglobalinvestments.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 YEAR ENDED DECEMBER 31* 

Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales charges (loads) or account fees are not reflected in the bar chart and if these amounts were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
*The returns in the bar chart are for Class I Shares. Class A Shares and Class C Shares would have substantially similar annual returns because each class of shares would have invested in the same portfolio of securities, and the annual returns would differ only to the extent that the classes have different expenses. The Fund’s Class A Shares are subject to a sales charge (load). Sales charges (loads) or account fees are not reflected in the bar chart and if these amounts were reflected, returns would be less than those shown.

 

Best and Worst Quarterly Performance (for the period reflected in the chart above):
Best Quarter: 5.29% (quarter ended September 30, 2017)
Worst Quarter: -1.48% (quarter ended March 31, 2017)
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns for the Periods Ended December 31, 2017
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 ("IRAs").
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the figure representing "Return 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 table below, which includes all applicable sales charges (loads) and account fees, compares the Fund's Class I, Class A and Class C Shares average annual total returns for the periods indicated 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.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

Thank you for your investment. If you have any questions, please call the Fund toll-free at 1-855-744-8500.
Summit Global Investments Small Cap Low Volatility Fund | Russell 2000® Index (reflects reinvestment of dividends and no deductions for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 14.65%
Since Inception rr_AverageAnnualReturnSinceInception 21.76%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016
Summit Global Investments Small Cap Low Volatility Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SCLVX
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 0.95%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.19% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.40%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.98%) [2]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.42%
One Year rr_ExpenseExampleYear01 $ 14,454
Three Years rr_ExpenseExampleYear03 65,474
Five Years rr_ExpenseExampleYear05 119,181
Ten Years rr_ExpenseExampleYear10 $ 266,153
Annual Return 2017 rr_AnnualReturn2017 8.71%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2017
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.29%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2017
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.48%)
1 Year rr_AverageAnnualReturnYear01 8.71%
Since Inception rr_AverageAnnualReturnSinceInception 17.57%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016
Summit Global Investments Small Cap Low Volatility Fund | Class I | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 5.41% [3]
Since Inception rr_AverageAnnualReturnSinceInception 15.46% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016 [3]
Summit Global Investments Small Cap Low Volatility Fund | Class I | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 5.79% [3]
Since Inception rr_AverageAnnualReturnSinceInception 12.93% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016 [3]
Summit Global Investments Small Cap Low Volatility Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LVSMX
Maximum Sales Charge (Load) Imposed on Purchases as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOther none [4]
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 0.95%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 1.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.19% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.65%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.98%) [2]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.67%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts on Class A Shares if you invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
One Year rr_ExpenseExampleYear01 686
Three Years rr_ExpenseExampleYear03 1,217
Five Years rr_ExpenseExampleYear05 1,773
Ten Years rr_ExpenseExampleYear10 $ 3,283
1 Year rr_AverageAnnualReturnYear01 2.88% [5]
Since Inception rr_AverageAnnualReturnSinceInception 13.86% [5]
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016 [5]
Summit Global Investments Small Cap Low Volatility Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SMLVX
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 0.95%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 1.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.19% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.40%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.98%) [2]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 2.42%
One Year rr_ExpenseExampleYear01 $ 245
Three Years rr_ExpenseExampleYear03 954
Five Years rr_ExpenseExampleYear05 1,685
Ten Years rr_ExpenseExampleYear10 $ 3,619
1 Year rr_AverageAnnualReturnYear01 7.67%
Since Inception rr_AverageAnnualReturnSinceInception 16.46%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016
[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. 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] Summit Global Investments, LLC (the "Adviser"), the Fund's investment adviser, has contractually agreed to waive management fees and reimburse expenses through March 31, 2019 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, Class A 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 March 31, 2019 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, short sale dividend expenses, brokerage commissions, extraordinary items, interest or taxes) for a year are less than 1.23%, 1.48% and 2.23% of the Fund's average daily net assets attributable to Class I Shares, Class A 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, provided such reimbursement does not cause the Fund to exceed 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. In certain cases, the figure representing "Return 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. 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 ("IRAs"). Class I Shares, Class A Shares and Class C Shares commenced operations on March 31, 2016.
[4] Effective January 1, 2018, a contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1,000,000 or more.
[5] Effective as of January 1, 2018, Class A Shares of the Fund are charged a 5.25% sales load. Accordingly, performance information for Class A Shares for periods prior to January 1, 2018 has been restated to reflect the effect of the sales load.