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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Feb. 28, 2018
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 Jun. 26, 2018
Document Effective Date dei_DocumentEffectiveDate Jun. 26, 2018
Prospectus Date rr_ProspectusDate Jun. 26, 2018
Entity Inv Company Type dei_EntityInvCompanyType N-1A
American Trust Allegiance Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading American Trust Allegiance Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The American Trust Allegiance Fund (the “Fund”) seeks capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
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 June 27, 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 63.14% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 63.14%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees
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 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 contractual 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 Advisor selects principally domestic and foreign stocks for the Fund’s portfolio that it expects will appreciate in value over the long term. Under normal market conditions, the Fund will invest at least 85% of its net assets (plus any borrowings for investment purposes) in domestic and foreign equity securities including both long and short positions. Short positions are limited to 10% of the Fund’s net assets. The Advisor uses a “bottom up” approach to stock investing and does not attempt to forecast the U.S. economy, interest rates, inflation or the U.S. stock market. The Advisor focuses on finding companies that meet its financial criteria, including either a history of consistent earnings and revenue growth or strong prospects of earnings and revenue growth, and a strong balance sheet. With respect to long equity positions, the Advisor purchases the securities of a company with the intention of holding them, under normal circumstances, for a minimum of three years. The Advisor typically purchases securities of companies which demonstrate leadership, operating momentum and strong prospects for annual growth rates of 10% or better. The Advisor may decide to sell a security due to changes in fundamentals, such as marked deceleration in earnings growth, decline in revenues or deterioration of the balance sheet, or a change in a company’s valuation or competitive position. Normally, the companies in which the Fund invests represent ten major economic or market sectors: consumer discretionary, consumer staples, energy, financial services, technology, industrials, utilities, communication services, materials and real estate. The Fund may have significant exposure to one or more of these sectors. For example, as of February 28, 2019, 25.4% of the Fund’s total investments were invested in securities within the technology sector. The Fund may also invest up to 25% of its net assets in real estate investment trusts (“REITs”).

The Fund avoids investments in companies that have significant involvement in the tobacco, pharmaceuticals, biotechnology, medical diagnostic services and products, gambling and liquor industries, although the Fund may engage in short sales of these companies. While the Fund may invest in or sell short a company that conducts operations in one of these industries, the Fund will not invest in such a company unless current revenues from these industries represent less than 5% of the total revenues of the company at the time of investment. The majority of companies in which the Fund invests will have no operations in these industries.

The Advisor expects that the Fund’s portfolio will generally consist predominantly of mid- and large-capitalization stocks, but in some market environments small-capitalization stocks may constitute a large portion of the Fund’s portfolio. The Advisor considers a small-capitalization stock to be one with a market capitalization of less than $1 billion at the time of investment; a mid-capitalization stock to be one with a market capitalization of between $1 billion and $10 billion at the time of investment; and a large-capitalization stock to be one with a market capitalization of more than $10 billion at the time of investment. The Fund may invest up to 40% of its net assets in foreign companies, including up to 30% of the Fund’s net assets in emerging markets, through U.S. listed securities, depositary receipts, such as, American Depositary Receipts (“ADRs”), or through purchases on foreign exchanges.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Losing all or a portion of your investment is a risk of investing in the Fund. There is no assurance that the Fund’s investment objective will be achieved. The following principal risks could affect the value of your investment:

•
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.
•
Management Risk. Your investment in the Fund varies with the success and failure of the Advisor’s investment strategies, as well as the Advisor’s research, analysis and determination of portfolio securities.
•
Socially Responsible Investing Policy Risk. The Fund’s portfolio is subject to socially responsible investment criteria. As a result, the Fund may pass up opportunities to buy certain securities when it is otherwise advantageous to do so, or may sell securities for social reasons when it is otherwise disadvantageous to do so.
•
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.
•
Small- and Medium-Sized Company Risk. Securities of companies with smaller market capitalizations tend to be more volatile and less liquid than larger market capitalization stocks.
•
Large-Sized Company Risk. Larger, more established companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. In addition, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.
•
Foreign Securities Risk. Investing in foreign securities typically involves more risks than investing in U.S. securities, and includes risks associated with: (i) internal and external political and economic developments – e.g., the political, economic and social policies and structures of some foreign countries may be less stable and more volatile than those in the U.S. or some foreign countries may be subject to trading restrictions or economic sanctions; (ii) trading practices – e.g., government supervision and regulation of foreign securities and currency markets, trading systems and brokers may be less than in the U.S.; (iii) availability of information – e.g., foreign issuers may not be subject to the same disclosure, accounting and financial reporting standards and practices as U.S. issuers; (iv) limited markets – e.g., the securities of certain foreign issuers may be less liquid (harder to sell) and more volatile; and (v) currency exchange rate fluctuations and policies.
•
ADR Risk. Investing in ADRs may involve risks in addition to the risks in domestic investments, including less regulatory oversight and less publicly-available information, less stable governments and economies, and non-uniform accounting, auditing and financial reporting standards.
•
Emerging Markets Risk. Investing in securities of issuers located in emerging markets poses greater risk of social, political and economic instability, which could affect the Fund’s investments. Emerging market countries may have smaller securities markets and therefore less liquidity and greater price volatility than more developed markets.
•
Sector Emphasis Risk. If the Fund’s portfolio is overweighted in certain sectors or related sectors, any negative development affecting that sector will have a greater impact on the Fund than a fund that is not overweight in that sector.
◦
Technology Sector Risk. Information technology companies face intense competition, both domestically and internationally, which may have an adverse effect on profit margins. Like other technology companies, information technology companies may have limited product lines, markets, financial resources or personnel. The products of information technology companies may face product obsolescence due to rapid technological developments and frequent new product introduction, unpredictable changes in growth rates and competition for the services of qualified personnel. Technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market.
•
Short Sales Risk. Short sales involve specific risk considerations and may be considered a speculative technique. The Fund may incur a loss as a result of a short sale if the price of the security increases between the date of the short sale and the date on which the Fund replaces the security sold short. Short sales transactions involve leverage because they can provide investment exposure in an amount exceeding the initial investment.
•
Real Estate Investment Trust (REIT) Risk. Investments in REITs will be subject to the risks associated with the direct ownership of real estate and annual compliance with tax rules applicable to REITs. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. In addition, REITs have their own expenses, and the Fund will bear a proportionate share of those expenses.

The Fund may be appropriate for investors who:

•
Want exposure to investments in companies that promote social responsibility;
•
Are pursuing a long-term goal such as retirement and those seeking the potential for long-term capital appreciation; and
•
Are willing to accept higher short-term risk along with higher potential for long-term growth of capital.
Risk Lose Money [Text] rr_RiskLoseMoney Losing all or a portion of your investment is a risk of investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Fund 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 return for the Fund from year to year. The table shows how the Fund’s average annual returns for the 1-, 5-, 10-year, and since inception periods, compare with those of a broad measure of market performance. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available on the Fund’s website at www.allegiancefund.com or by calling toll free at 1-800-385-7003.
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 1-800-385-7003
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.allegiancefund.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns as of December 31*
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock
* The Fund’s year-to-date total return as of March 31, 2019 was 13.35%.

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period shown in the bar chart, the Fund’s highest quarterly return was 20.34% for the quarter ended June 30, 2009, and the lowest quarterly return was -16.34% for the quarter ended September 30, 2011.

Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 13.35%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.34%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.34%)
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. 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 Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher 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.
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 situation and may differ from those shown. 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.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (For the periods ended December 31, 2018)
American Trust Allegiance 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%
Since Inception rr_AverageAnnualReturnSinceInception 7.31%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 11, 1997
American Trust Allegiance Fund | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol ATAFX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.95%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.90%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.85% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.39%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.46%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 149
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 544
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 964
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,137
Annual Return 2009 rr_AnnualReturn2009 29.40%
Annual Return 2010 rr_AnnualReturn2010 13.11%
Annual Return 2011 rr_AnnualReturn2011 (0.27%)
Annual Return 2012 rr_AnnualReturn2012 16.28%
Annual Return 2013 rr_AnnualReturn2013 26.07%
Annual Return 2014 rr_AnnualReturn2014 3.74%
Annual Return 2015 rr_AnnualReturn2015 (5.07%)
Annual Return 2016 rr_AnnualReturn2016 5.43%
Annual Return 2017 rr_AnnualReturn2017 25.23%
Annual Return 2018 rr_AnnualReturn2018 (13.79%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (13.79%)
5 Years rr_AverageAnnualReturnYear05 2.31%
10 Years rr_AverageAnnualReturnYear10 9.14%
Since Inception rr_AverageAnnualReturnSinceInception 5.80%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 11, 1997
American Trust Allegiance Fund | Investor Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (15.04%)
5 Years rr_AverageAnnualReturnYear05 1.20%
10 Years rr_AverageAnnualReturnYear10 8.45%
Since Inception rr_AverageAnnualReturnSinceInception 5.41%
American Trust Allegiance 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 (7.18%)
5 Years rr_AverageAnnualReturnYear05 1.75%
10 Years rr_AverageAnnualReturnYear10 7.50%
Since Inception rr_AverageAnnualReturnSinceInception 4.86%
[1] Total Annual Fund Operating Expenses do not correlate to the Ratio of Expenses to Average Net Assets Before Fee Waiver provided in the Financial Highlights section of the statutory prospectus, which reflects the actual operating expenses of the Fund and does not include 0.01% that is attributed to acquired fund fees and expenses (“AFFE”).
[2] American Trust Investment Advisors, LLC (the “Advisor”) has contractually agreed to waive a portion or all of its management fee and pay Fund expenses to ensure that Total Annual Fund Operating Expenses After Fee Waiver (excluding AFFE, taxes, interest expense and extraordinary expenses) do not exceed 1.45% of the Fund’s average daily net assets (the “Expense Cap”). The Expense Cap will remain in effect through at least June 27, 2020, and may be terminated only by the Trust’s Board of Trustees (the “Board”). The Advisor may request recoupment of previously waived fees and paid expenses from the Fund for 36 months from the date they were waived or paid, subject to the Expense Cap.