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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Capital Advisors Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Capital Advisors Growth Fund (the “Fund”) seeks to achieve long-term capital growth.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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 you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2014-04-29
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 annual fund operating expenses or in the Example, affect the Fund’s performance.  During the most recent fiscal year, the Fund’s portfolio turnover rate was 34.53% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 34.53%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses do not correlate to the "Ratio of Expenses to Average Net Assets Before Expense Reimbursement" found in the Financial Highlights, which reflects the Fund's operating expenses and does not include acquired fund fees and expenses ("AFFE").
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 Fund for the time periods indicated and that you 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 (taking into account the Expense Cap only in the first year).  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
The Fund invests primarily in common stocks of U.S. companies.  The Fund may also invest in securities of foreign companies that are publicly traded in the U.S., including American Depositary Receipts (“ADRs”).  Under normal conditions, the Fund will invest at least 65% of its total assets in common stocks of companies that the Advisor believes have the potential for long-term growth of capital.  The Advisor uses the growth style of investing.  Growth stocks are securities of companies that have or are expected to have above average earnings growth.  The Fund may also write covered call options on up to 33% of its net assets for the purpose of generating additional income for the Fund.

The Fund buys and sells stocks based on the Advisor’s research, and focuses on characteristics that the Advisor believes allow a company to grow at an above-average rate for an extended period of time, including: dominant position within its industry; sustainable competitive advantage; shareholder oriented management philosophy; strong brand or franchise value; operating within a definable growing market; and strong research and development.

The Fund will consider selling stocks in its portfolio when the stock reaches its target, fundamentals supporting the stock’s value deteriorate, and/or better investment alternatives exist.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The Fund cannot guarantee that it will achieve its investment objective.  There is the risk that you could lose money on your investment in the Fund.  The following are the principal risks that could adversely affect the value of your investment in the Fund:

·  
Equity Risk – the equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value.  This may occur because of factors that affect securities markets generally or factors affecting specific industries, sectors or companies in which the Fund invests;

·  
Growth-Style Investing Risk – growth stocks may be more volatile than other types of stocks and may perform differently from the market as a whole;

·  
Management Risk – the Fund’s ability to achieve its investment objective depends on the ability of the Advisor to correctly identify economic trends and select stocks, particularly in volatile stock markets;

·  
Market Risk – the value of stocks and other securities the Fund holds or the overall stock market may decline over short or extended periods;

·  
Options Risk.  Writing call options is a highly specialized activity and entails greater than ordinary investment risks. By writing (or selling) a call option, the Fund loses the potential for gain on the underlying security above the exercise price.  If the call option is exercised, the Fund misses out on any gain from an increase in the market price over the exercise price.

·  
Non-U.S. Investment Risk – the Fund may invest, without limit, in foreign securities.  These investments are subject to special risks.  Foreign securities can be more volatile than domestic (U.S.) securities.  Securities markets of other countries are generally smaller than U.S. securities markets.  Many foreign securities may be less liquid and more volatile than U.S. securities, which could affect the Fund’s investments.

Who May Want to Invest in the Fund?

The Fund may be appropriate for investors who:

·
Are pursuing a long-term goal such as retirement;

·
Want to add an investment with growth potential to diversify their investment portfolio; or

·
Are willing to accept higher short-term risk along with a higher potential for long-term growth.
Risk Lose Money [Text] rr_RiskLoseMoney There is the risk that you could lose money on your investment in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance from year to year.  The table shows how the Fund’s average annual returns for the 1-, 5- and 10-year periods compare with those of a broad measure of market performance, as well as an index that reflects the market sectors in which the Fund invests. The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future.  Updated performance information is available on the Fund’s website at www.ciaox.com or by calling the Fund toll-free at 1-866-205-0523.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance from year to year.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-866-205-0523
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.ciaox.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance, before and after taxes, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period shown in the bar chart, the Fund’s highest quarterly return was 14.41% for the quarter ended June 30, 2003, and the lowest quarterly return was -14.80% for the quarter ended December 31, 2008.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2003
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.41%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (14.80%)
Index No Deduction for Fees, Expenses, Taxes [Text] 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 Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts ("IRAs").
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (For the periods ended December 31, 2012)
S&P 500® Index
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P 500® Index
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 16.00%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.66%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.10%
Russell 1000® Growth Index
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 1000® Growth Index
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.26%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.12%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.52%
Investor Class
  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and Service (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.65%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.67% [1]
Less: Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.40%)
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.27% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 129
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 487
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 870
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,943
Annual Return 2003 rr_AnnualReturn2003 33.12%
Annual Return 2004 rr_AnnualReturn2004 12.52%
Annual Return 2005 rr_AnnualReturn2005 5.39%
Annual Return 2006 rr_AnnualReturn2006 6.93%
Annual Return 2007 rr_AnnualReturn2007 12.96%
Annual Return 2008 rr_AnnualReturn2008 (29.41%)
Annual Return 2009 rr_AnnualReturn2009 21.74%
Annual Return 2010 rr_AnnualReturn2010 11.54%
Annual Return 2011 rr_AnnualReturn2011 1.44%
Annual Return 2012 rr_AnnualReturn2012 12.74%
Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.74%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.85%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.65%
Investor Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.59%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.76%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.60%
Investor Class | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.47%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.57%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.77%
[1] Total Annual Fund Operating Expenses do not correlate to the "Ratio of Expenses to Average Net Assets Before Expense Reimbursement" found in the Financial Highlights, which reflects the Fund's operating expenses and does not include acquired fund fees and expenses ("AFFE").
[2] Capital Advisors, Inc. (the "Advisor") has contractually agreed to waive a portion or all of its management fees and/or pay Fund expenses to ensure that Net Annual Fund Operating Expenses (excluding AFFE, taxes, interest and extraordinary expenses) do not exceed 1.25% of the Fund's average daily net assets for its current fiscal year (the "Expense Cap"). The Expense Cap will remain in effect through at least April 29, 2014, and may only be terminated by the Board of Trustees (the "Board") of Advisors Series Trust (the "Trust"). The Advisor may request recoupment of previously waived fees and paid expenses from the Fund for three years from the date they were waived or paid, subject to the Expense Cap.