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Element

Value

Risk/Return:

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Risk/Return [Heading]

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Summit Global Investments U.S. Low Volatility Equity Fund

Objective [Heading]

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Investment Objective

Objective, Primary [Text Block]

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The Summit Global Investments U.S. Low Volatility Equity Fund (the "Fund") seeks to outperform the S&P 500^® Index over a market cycle while reducing overall volatility. There can be no guarantee that the Fund will achieve its investment objective.

Expense [Heading]

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Expenses and Fees

Expense Narrative [Text Block]

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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]

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Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

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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

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2015-12-31

Portfolio Turnover [Heading]

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Portfolio Turnover

Portfolio Turnover [Text Block]

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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, 2014, the Fund's portfolio turnover rate was 110% of the average value of its portfolio.

Portfolio Turnover, Rate

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Expense Example [Heading]

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Example:

Expense Example Narrative [Text Block]

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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 and Retail 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]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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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 companies within the Russell 1000^® Index and S&P 500^® Index. 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 S&P 500^® 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 capital protection and more consistent returns.

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Principal Risks

Risk Narrative [Text Block]

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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 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 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 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.

Risk Lose Money [Text]

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Loss of money is a risk of investing in the Fund.

Bar Chart and Performance Table [Heading]

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Performance Information

Performance Narrative [Text Block]

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The chart below illustrates the performance of the Fund's Class I Shares for its first full calendar year ended December 31, 2013. The information 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]

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The information provides some indication of the risks of investing in the Fund.

Performance Availability Phone [Text]

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1-855-744-8500

Performance Availability Website Address [Text]

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www.summitglobalinvestments.com

Performance Past Does Not Indicate Future [Text]

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As with all such investments, past performance (before and after taxes) is not an indication of future results.

Bar Chart [Heading]

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TOTAL RETURNS FOR THE CALENDAR YEAR ENDED DECEMBER 31

Bar Chart Closing [Text Block]

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Best and Worst Quarterly Performance (for the period reflected in the chart above):
Best Quarter: 13.53% (quarter ended March 31, 2013)
Worst Quarter: (1.56)% (quarter ended June 30, 2013)

Year-to-date total return for the nine months ended September 30, 2014: 6.92%

Year to Date Return, Label

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Year-to-date total return

Bar Chart, Year to Date Return, Date

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Sep. 30, 2014

Bar Chart, Year to Date Return

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Highest Quarterly Return, Label

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Best Quarter:

Highest Quarterly Return, Date

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Mar. 31, 2013

Highest Quarterly Return

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Lowest Quarterly Return, Label

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Worst Quarter:

Lowest Quarterly Return, Date

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Jun. 30, 2013

Lowest Quarterly Return

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Performance Table Heading

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AVERAGE ANNUAL TOTAL RETURNS

Performance Table Uses Highest Federal Rate

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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

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Actual after-tax returns depend on an investor's tax situation and may differ from those shown. 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 ("IRA").

Performance Table Narrative

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The table below compares the Fund's Class I average annual total returns for the past calendar year and since inception 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.

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AVERAGE ANNUAL TOTAL RETURNS FOR THE PERIODS ENDED DECEMBER 31, 2013

S&P 500® Index

Risk/Return:

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Average Annual Returns, 1 Year

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Average Annual Returns, Since Inception

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Average Annual Returns, Inception Date

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Feb. 29, 2012

Class A

Risk/Return:

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Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

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Maximum Deferred Sales Charge (Load)

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none

Maximum Sales Charge (Load) Imposed on Reinvested Dividends

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none

Redemption Fee (as a percentage of amount redeemed, if applicable)

rr_RedemptionFeeOverRedemption

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Management Fees

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Distribution and/or Service (12b-1) Fee

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Total Annual Fund Operating Expenses

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Less Fee Waivers and Expense Reimbursements

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^[1]

Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements

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Expense Breakpoint Discounts [Text]

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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]

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Expense Example, with Redemption, 1 Year

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Expense Example, with Redemption, 3 Years

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Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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Retail Class

Risk/Return:

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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

rr_ExchangeFeeOverRedemption

Management Fees

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Distribution and/or Service (12b-1) Fee

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Total Annual Fund Operating Expenses

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Less Fee Waivers and Expense Reimbursements

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^[1]

Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements

rr_NetExpensesOverAssets

Expense Example, with Redemption, 1 Year

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Expense Example, with Redemption, 3 Years

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Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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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, if applicable)

rr_RedemptionFeeOverRedemption

rr_ExchangeFeeOverRedemption

Management Fees

rr_ManagementFeesOverAssets

Distribution and/or Service (12b-1) Fee

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

Less Fee Waivers and Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

^[1]

Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements

rr_NetExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

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Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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Annual Return 2013

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Average Annual Returns, 1 Year

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Average Annual Returns, Since Inception

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Average Annual Returns, Inception Date

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Feb. 29, 2012

Class I | After Taxes on Distributions

Risk/Return:

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Average Annual Returns, 1 Year

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^[2]

Average Annual Returns, Since Inception

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^[2]

Class I | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

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Average Annual Returns, 1 Year

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Average Annual Returns, Since Inception

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[1]

Summit Global Investments, LLC (the "Adviser"), the Fund's investment adviser, has contractually agreed to waive management fees and reimburse expenses through December 31, 2015 to the extent that Total Annual Fund Operating Expenses (excluding certain items discussed below) exceed 1.23% of the average daily net assets attributable to the Fund's Class A Shares or Retail Shares and 0.98% of the average daily net assets attributable to the Fund's Class I Shares. 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% or 0.98%, as applicable: acquired fund fees and expenses, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation may not be terminated before December 31, 2015 without the approval of the Board of Directors of The RBB Fund, Inc. Effective January 1, 2012, if at any time the Fund's Total Annual Fund Operating Expenses for that year are less than 1.23% of the average daily net assets attributable to the Fund's Class A Shares or Retail Shares or less than 0.98% of the average daily net assets attributable to the Fund's Class I Shares, 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.

[2]

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. 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 ("IRA").