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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Apr. 30, 2019
Entity Registrant Name dei_EntityRegistrantName ADVISORS SERIES TRUST
Entity Central Index Key dei_EntityCentralIndexKey 0001027596
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Apr. 30, 2019
Document Effective Date dei_DocumentEffectiveDate Apr. 30, 2019
Prospectus Date rr_ProspectusDate Apr. 30, 2019
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Capital Advisors Growth Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
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 Investor Class shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment)
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
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 April 29, 2020
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 46.32% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 46.32%
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 Fee Waivers” found in the Financial Highlights of the statutory prospectus, which reflects the Fund’s operating expenses and does not include expenses attributed to 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).
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption 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 domestic (U.S.) companies. The Fund may also invest in securities of foreign companies that are publicly traded in the U.S., including in American Depositary Receipts (“ADRs”). Under normal conditions, the Fund invests 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 equity 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.

The Fund may also invest in cash, cash equivalents, and high-quality, short-term debt securities and money market instruments for temporary defensive purposes.
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.
•
Market and Regulatory Risk – Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the Fund’s performance. Market events may affect a single issuer, industry, sector, or the market as a whole. Traditionally liquid investments may experience periods of diminished liquidity. Governmental and regulatory actions, including tax law changes, may also impair portfolio management and have unexpected or adverse consequences on particular markets, strategies, or investments.
•
Equity Securities Risk – The price of equity securities may rise or fall because of economic or political changes or changes in a company’s financial condition, sometimes rapidly or unpredictably. These price movements may result from factors affecting individual companies, sectors or industries selected for the Fund’s portfolio or the securities market as a whole, such as changes in economic or political conditions.
•
Growth-Style Investing Risk – Over time, a growth oriented investing style may go in and out of favor, which may cause the Fund to underperform other equity funds that use different investing styles.
•
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.
•
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 – 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.
•
Depositary Receipt Risk – The risks of depository receipts include many risks associated with investing directly in foreign securities, such as individual country risk and liquidity risk. Unsponsored ADRs, which are issued by a depositary bank without the participation or consent of the issuer, involve additional risks because U.S. reporting requirements do not apply, and the issuing bank will recover shareholder distribution costs from movement of share prices and payment of dividends.

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 the annual returns for the Fund from year to year. The table shows how the Fund’s average annual returns for the 1-year, 5-year 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.capadvfunds.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.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-866-205-0523
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.capadvfunds.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 Closing [Text Block] rr_BarChartClosingTextBlock
During the period of time shown in the bar chart, the Fund’s highest quarterly return was 12.35% for the quarter ended March 31, 2012, and the lowest quarterly return was -15.23% for the quarter ended December 31, 2018.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.35%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.23%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(For the periods ended December 31, 2018)
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 tax 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”).
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
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 your tax 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”). The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Capital Advisors Growth Fund | S&P 500® Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P 500® Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (4.38%)
5 Years rr_AverageAnnualReturnYear05 8.49%
10 Years rr_AverageAnnualReturnYear10 13.12%
Capital Advisors Growth Fund | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 1000® Growth Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (1.51%)
5 Years rr_AverageAnnualReturnYear05 10.40%
10 Years rr_AverageAnnualReturnYear10 15.29%
Capital Advisors Growth Fund | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol CIAOX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.43%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.20% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.18%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 104
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 363
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 642
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,439
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%
Annual Return 2013 rr_AnnualReturn2013 29.10%
Annual Return 2014 rr_AnnualReturn2014 12.57%
Annual Return 2015 rr_AnnualReturn2015 (3.22%)
Annual Return 2016 rr_AnnualReturn2016 9.71%
Annual Return 2017 rr_AnnualReturn2017 14.98%
Annual Return 2018 rr_AnnualReturn2018 (4.80%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (4.80%)
5 Years rr_AverageAnnualReturnYear05 5.52%
10 Years rr_AverageAnnualReturnYear10 10.12%
Capital Advisors Growth Fund | Investor Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (6.17%)
5 Years rr_AverageAnnualReturnYear05 4.02%
10 Years rr_AverageAnnualReturnYear10 9.21%
Capital Advisors Growth Fund | Investor Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (1.76%)
5 Years rr_AverageAnnualReturnYear05 4.24%
10 Years rr_AverageAnnualReturnYear10 8.32%
[1] Total Annual Fund Operating Expenses do not correlate to the “Ratio of Expenses to Average Net Assets Before Fee Waivers” found in the Financial Highlights of the statutory prospectus, which reflects the Fund’s operating expenses and does not include expenses attributed to 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 pay Fund expenses to ensure that Total Annual Fund Operating Expenses (excluding AFFE, taxes, interest and extraordinary expenses) do not exceed 1.00% of the Fund’s average daily net assets (the “Expense Cap”). The Expense Cap will remain in effect through at least April 29, 2020, and may only be terminated by the Board of Trustees (the “Board”) of Advisors Series Trust (the “Trust”).