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Label Element Value
Risk Return [Abstract] rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Dec. 31, 2011
Perimeter Small Cap Growth Fund (First Prospectus Summary) | Perimeter Small Cap Growth Fund
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading SUMMARY SECTION
Investment Objective, Heading rr_ObjectiveHeading INVESTMENT OBJECTIVE
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
The investment objective of the Perimeter Small Cap Growth Fund (the "Fund") is
to seek long-term capital appreciation.
Expense, Heading rr_ExpenseHeading EXPENSES AND FEES
Expense, Narrative rr_ExpenseNarrativeTextBlock 
This table describes the fees and expenses that you may pay if you buy and hold
Investor Class shares of the Fund.
Shareholder Fees, Caption rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses, Caption rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover 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 During the most recent fiscal year ended August 31, 2011, the Fund's
portfolio turnover rate was 122%, of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 122.00%
Expense Example, Heading rr_ExpenseExampleHeading Example
Expense Example, Narrative 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 Fund for the time periods indicated and that you sell 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 and returns might be higher or lower, based on these
assumptions your costs would be:
Investment Strategy, Heading rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock 
Under normal circumstances, the Fund invests at least 80% of its net assets in
small-cap equity securities. This investment policy may be changed by the Fund
upon 60 days' prior notice to shareholders. The Fund currently defines small-cap
equity securities as those of companies with market capitalizations between $50
million and $3 billion at the time of purchase. The Fund's investments will
generally consist of U.S. traded securities, which may include common stocks,
preferred stocks, warrants to acquire common stock, securities convertible into
common stock, and American Depositary Receipts ("ADRs"). ADRs may be available
through "sponsored" or "unsponsored" facilities. A sponsored facility is
established jointly by the issuer of the security underlying the receipt and the
depository, whereas an unsponsored facility is established by the depository
without participation by the issuer of the underlying security. The Fund
purchases equity securities and ADRs traded in the U.S. on registered exchanges
or the over-the-counter market.

The Fund's investment philosophy is based on the premise that a portfolio of
small cap stocks with positive earnings trends, reasonable valuation, and strong
fundamentals will provide superior returns over time. The Adviser selects
companies with strong current earnings growth, improving profitability, strong
balance sheets, and strong current and projected business fundamentals which are
priced at reasonable valuations. The Adviser believes in executing a very
disciplined and objective investment process and in controlling risk through a
broadly diversified portfolio. Because companies tend to shift in relative
attractiveness, the Fund may buy and sell securities frequently, which
may result in higher transaction costs, additional capital gains tax liabilities
and may adversely impact performance.

In addition, in order to implement its investment strategy, the Adviser may buy
or sell, to a limited extent, derivative instruments to use as a substitute for
a purchase or sale of a position in the underlying assets and/or as part of a
strategy designed to reduce exposure to other risks, such as market risk. The
Fund may purchase or sell futures contracts; sell options on a futures contract;
purchase or write put and call options on securities, securities indices and
currencies; or enter into equity index or interest rate swap agreements as the
Adviser determines is appropriate in seeking the Fund's investment objective.
The Fund may use derivatives for bona fide hedging; attempting to increase
yield; attempting to offset changes in the value of securities held or expected
to be acquired or be disposed of; or attempting to gain exposure to a particular
market, index or instrument.

The Adviser will identify sell candidates for a variety of reasons, including
but not limited to: (i) business fundamentals peak, begin to change or
deteriorate; (ii) earnings characteristics change, including negative estimate
revisions, negative earnings surprise and slowing earnings and/or revenue
momentum; (iii) a stock reaches extreme overvaluation; and (iv) a stock's
ranking weakens within the selection universe. The Adviser will not necessarily
sell a security that has appreciated or depreciated outside the stated market
capitalization range defined above.
Risk, Heading rr_RiskHeading PRINCIPAL INVESTMENT RISKS
Risk, Narrative rr_RiskNarrativeTextBlock 
As with all mutual funds, a shareholder is subject to the risk that his or her
investment could lose money. The principal risk factors affecting shareholders'
investments in the Fund are set forth below.

Since it purchases equity securities, the Fund is subject to the risk that stock
prices will fall over short or extended periods of time. Historically, the
equity markets have moved in cycles, and the value of the Fund's equity
securities may fluctuate drastically from day to day. Individual companies may
report poor results or be negatively affected by industry and/or economic trends
and developments. The prices of securities issued by such companies may suffer a
decline in response. These factors contribute to price volatility, which is the
principal risk of investing in the Fund.

The Fund is also subject to the risk that small-capitalization stocks may
underperform other segments of the equity market or the equity market as a
whole. The small-capitalization companies that the Fund invests in may be more
vulnerable to adverse business or economic events than larger, more established
companies. In particular, these small-cap companies may have limited product
lines, markets and financial resources, and may depend upon a relatively small
management group. Therefore, small-cap stocks may be more volatile than those of
larger companies. These securities may be traded over-the-counter or listed on
an exchange.

Because the Fund may invest in ADRs, it is subject to some of the same risks as
direct investments in foreign companies. These include the risk that political
and economic events unique to a country or region will affect those markets and
their issuers. These events will not necessarily affect the U.S. economy or
similar issuers located in the United States. If the Fund holds unsponsored ADRs
it will generally bear all of the costs of the unsponsored facility. The
depository of an unsponsored facility is frequently under no obligation to
distribute shareholder communications received from the issuer of the deposited
security or to pass through, to the holders of the receipts, voting rights with
respect to the deposited securities. The depository of unsponsored depositary
receipts may provide less information to receipt holders.

The Fund's investments in derivative instruments, including futures contracts,
put and call options, and swaps, may be leveraged and result in losses exceeding
the amounts invested. An option is a type of derivative instrument that gives
the holder the right (but not the obligation) to buy (a "call") or sell (a
"put") an asset in the near future at an agreed upon price prior to the
expiration date of the option. The Fund may "cover" a call option by owning the
security underlying the option or through other means. The value of options can
be highly volatile, and their use can result in loss if the Adviser is incorrect
in its expectation of price fluctuations.

The Fund may frequently trade its portfolio securities. High portfolio turnover
will cause the Fund to incur higher brokerage commissions and transaction costs,
which could lower the Fund's performance. In addition to lower performance, high
portfolio turnover could result in taxable capital gains.
Risk, Lose Money rr_RiskLoseMoney As with all mutual funds, a shareholder is subject to the risk that his or her investment could lose money.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading PERFORMANCE INFORMATION
Performance, Narrative rr_PerformanceNarrativeTextBlock 
The bar chart and the performance table below illustrates the long-term
performance of the Fund. The information shows you how the Fund's performance
has varied year by year and provides some indication of the risks of investing
in the Fund. On February 8, 2010, substantially all of the assets of the
Perimeter Small Cap Growth Fund, a portfolio of The Advisors' Inner Circle Fund
II (the "Predecessor Fund"), were transferred to the Fund in a tax-free
reorganization (the "Reorganization"). As a result of the Reorganization, the
performance and accounting history of the Predecessor Fund prior to the date
of the Reorganization was assumed by the Fund and the Fund's fiscal year end
changed from July 31 to August 31. The performance information shown below for
periods prior to February 8, 2010 is that of the Investor Class Shares of the
Predecessor Fund, which commenced operations on September 29, 2006. The bar
chart assumes reinvestment of dividends and distributions. Total returns
would have been lower had certain fees and expenses not been waived or
reimbursed. Past performance (before and after taxes) does not necessarily
indicate how the Fund will perform in the future. Updated performance
information is available at www.perimetercap.com or 1-888-968-4964.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the performance table below illustrates the long-term performance of the Fund.
Performance, Availability Phone Number rr_PerformanceAvailabilityPhone 1-888-968-4964
Performance, Availability Website Address rr_PerformanceAvailabilityWebSiteAddress www.perimetercap.com
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Bar Chart, Heading rr_BarChartHeading TOTAL RETURNS FOR THE CALENDAR YEARS ENDED DECEMBER 31 Investor Class Shares
Bar Chart, Closing rr_BarChartClosingTextBlock 
Best and Worst Quarterly Performance (for the periods reflected in the chart
above)

Best Quarter:                      Worst Quarter:
22.86%                             (26.44)%
(quarter ended June 30, 2009)      (quarter ended December 31, 2008)

Year to Date Total Return as of September 30, 2011: (17.92)%
Performance Table, Heading rr_PerformanceTableHeading Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses or taxes
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.
Performance Table, One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown Your actual after-tax returns will depend on your tax situation and may differ from those shown.
Performance Table, Narrative rr_PerformanceTableNarrativeTextBlock 
This table compares the average annual total returns of the Predecessor Fund's
and Fund's Investor Class Shares for the calendar year ended December 31, 2010
and since inception to those of the Russell 2000® Growth Index. The returns
shown below for periods prior to the Reorganization on February 8, 2010 are for
the Predecessor Fund.
Perimeter Small Cap Growth Fund (First Prospectus Summary) | Perimeter Small Cap Growth Fund | Russell 2000® Growth Index
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Russell 2000® Growth Index (reflects no deduction for fees, expenses or taxes) [1]
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 29.09%
Average Annual Returns, 3 Years ck0000831114_AverageAnnualReturnYear03 2.18%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.23% [2]
Perimeter Small Cap Growth Fund (First Prospectus Summary) | Perimeter Small Cap Growth Fund | Investor Class
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (Charged on redemptions within 7 days of purchase) rr_RedemptionFeeOverRedemption (2.00%)
Exchange Fee (Charged on exchanges within 7 days of purchase) rr_ExchangeFeeOverRedemption 2.00%
Management fees rr_ManagementFeesOverAssets 0.90%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.24%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.39%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.35%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-12-31
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 137
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 436
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 757
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,665
Annual Return 2007 rr_AnnualReturn2007 7.66%
Annual Return 2008 rr_AnnualReturn2008 (39.20%)
Annual Return 2009 rr_AnnualReturn2009 31.67%
Annual Return 2010 rr_AnnualReturn2010 25.14%
Year to Date Return, Label rr_YearToDateReturnLabel Year to Date Total Return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2011
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (17.92%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.86%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.44%)
Average Annual Returns, Label rr_AverageAnnualReturnLabel Fund Returns Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 25.14%
Average Annual Returns, 3 Years ck0000831114_AverageAnnualReturnYear03 0.06%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.72% [2]
Perimeter Small Cap Growth Fund (First Prospectus Summary) | Perimeter Small Cap Growth Fund | Investor Class | After Taxes on Distributions
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Fund Returns After Taxes on Distributions [4]
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 25.14%
Average Annual Returns, 3 Years ck0000831114_AverageAnnualReturnYear03 0.06%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.62% [2]
Perimeter Small Cap Growth Fund (First Prospectus Summary) | Perimeter Small Cap Growth Fund | Investor Class | After Taxes on Distributions and Sales
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Fund Returns After Taxes on Distributions and Sale of Fund Shares [4]
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 16.34%
Average Annual Returns, 3 Years ck0000831114_AverageAnnualReturnYear03 0.05%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.13% [2]
[1] The Russell 2000® Growth Index measures the performance of those Russell 2000® companies with higher price-to-book ratios and higher forecasted growth values. The Russell 2000® Index is a widely-recognized, capitalization-weighted index that measures the performance of the smallest 2,000 companies in the Russell 3000® Index. As of November 30, 2011, the market capitalization range of the companies in the Russell 2000 Growth Index was between $29 million and $3.7 billion.
[2] The Fund's inception date was September 29, 2006. Index comparisons begin September 30, 2006.
[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 1.35% of the Fund's average daily net assets attributable to Investor Class 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 1.35%: acquired fund fees and expenses, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation is in effect until December 31, 2012 and may not be terminated without the approval of the Board of Directors of The RBB Fund, Inc. If at any time during the first three years the Advisory Agreement is in effect, the Fund's Investor Class Shares Total Annual Fund Operating Expenses for that year are less than 1.35%, the Adviser may recoup any waived amount from the Fund if such reimbursement does not cause the Fund to exceed existing expense limitations.
[4] 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. Your actual after-tax returns will depend on your 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.