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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Mar. 31, 2020
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 Jul. 27, 2020
Document Effective Date dei_DocumentEffectiveDate Jul. 29, 2020
Prospectus Date rr_ProspectusDate Jul. 29, 2020
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Aasgard Small & Mid-Cap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Aasgard Small & Mid-Cap Fund
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks a combination of dividend income and capital appreciation,
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock
with a secondary focus on lower than market volatility.
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 No Load 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 7/29/2021
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 46.85% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 46.85%
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 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
Under normal market conditions, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in dividend-paying common stocks of small- and medium-sized companies. The Fund invests primarily in the common stocks of domestic small- and medium-sized companies with market capitalizations under $15 billion that the Advisor believes have strong growth potential and attractive dividend and yield opportunities. The Fund may also invest up to 15% of its net assets in real estate investment trusts (“REITs”).

The Advisor employs a proprietary ranking system to evaluate the universe of U.S. small- and medium-sized capitalization companies that are traded on U.S. exchanges. Companies are ranked within their sectors according to their relative dividend yield, dividend growth, dividend consistency, valuation, free-cash flow, and payout ratio. Each stock considered for purchase must have (i) a current yield of at least 1.00% and (ii) issuer’s five year projected dividend growth rate of at least 5%. Holdings are reviewed for sale if they have fallen more than 10% since their purchase and may be replaced with stocks the Advisor believes have a higher potential for gain. This often has the additional benefit of realizing taxable losses that can be used to offset future realized gains. The Fund’s strategy strives to reduce volatility by limiting individual positions sizes to 5% of the Fund’s total assets and by limiting single industry exposure to less than 20% of the Fund’s total assets.

Target prices are developed for each security, but the Advisor does not have a strict sell discipline. The Advisor believes that in times of extreme market volatility, a strict sell discipline would require wholesale liquidations resulting in extremely large cash positions. Under most circumstances, the Advisor will not hold cash positions in excess of 15% of the Fund’s net assets in order to maintain participation in growth opportunities in the overall market but will consider cash positions in excess of this threshold under certain market or economic conditions.
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. The following risks could affect the value of your investment:

•
Small- and Medium-Sized Companies Risk – Small- and medium-sized companies often have less predictable earnings, more limited product lines, markets, distribution channels or financial resources and the management of such companies may be dependent upon one or few key people. The market movements of equity securities of small- and medium-sized companies may be more abrupt and volatile than the market movements of equity securities of larger, more established companies or the stock market in general and small-sized companies in particular, are generally less liquid than the equity securities of larger companies.
•
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. The Fund’s investments may decline in value due to factors affecting individual issuers (such as the results of supply and demand), or sectors within the securities markets. The value of a security or other investment also may go up or down due to general market conditions that are not specifically related to a particular issuer, such as real or perceived adverse economic conditions, changes in interest rates or exchange rates, or adverse investor sentiment generally. In addition, unexpected events and their aftermaths, such as the spread of deadly diseases; natural, environmental or man-made disasters; financial, political or social disruptions; terrorism and war; and other tragedies or catastrophes, can cause investor fear and panic, which can adversely affect the economies of many companies, sectors, nations, regions and the market in general, in ways that cannot necessarily be foreseen.
•
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.
•
Investment Style Risk – The Fund’s investments in dividend-paying common stocks may cause the Fund to underperform funds that do not limit their investments to dividend-paying common stocks during periods when dividend-paying stocks underperform other types of stocks. In addition, if stocks held by the Fund reduce or stop paying dividends, the Fund’s ability to generate income may be affected.
•
Growth Stock 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 – If the Advisor’s investment strategies do not produce the expected results, the value of the Fund may decrease.
•
Real Estate Investment Trust (REIT) Risk – Investments in REITs will be subject to the risks associated with the direct ownership of real estate. 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. REITs have their own expenses, and the Fund will bear a proportionate share of those expenses. In addition, the value of an individual REIT’s securities can decline if the REIT fails to continue qualifying for special tax treatment.
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 Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following 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-year and since inception periods compare with 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 www.coldstream.com/mutual-fund-home or by calling the Fund toll-free at 1-877-476-1909.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-877-476-1909
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.coldstream.com/mutual-fund-home
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 Closing [Text Block] rr_BarChartClosingTextBlock
The Fund’s calendar year-to-date return as of June 30, 2020 was -10.76%.

Highest Quarterly Return
1Q: 2019
10.56
 %
Lowest Quarterly Return
4Q: 2018
-13.62
 %
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (10.76%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.56%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.62%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the period ended December 31, 2019)
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”).
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. 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”).
Aasgard Small & Mid-Cap Fund | S&P MidCap® 400 Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P MidCap® 400 Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 26.20%
Since Inception rr_AverageAnnualReturnSinceInception 11.63%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 01, 2016
Aasgard Small & Mid-Cap Fund | No Load Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol AADGX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.39%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 1.24%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.24%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 370
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 658
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,479
Annual Return 2017 rr_AnnualReturn2017 15.49%
Annual Return 2018 rr_AnnualReturn2018 (5.21%)
Annual Return 2019 rr_AnnualReturn2019 19.74%
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.74%
Since Inception rr_AverageAnnualReturnSinceInception 11.73%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 01, 2016
Aasgard Small & Mid-Cap Fund | No Load Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 19.37%
Since Inception rr_AverageAnnualReturnSinceInception 10.97%
Aasgard Small & Mid-Cap Fund | No Load 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 11.93%
Since Inception rr_AverageAnnualReturnSinceInception 9.07%
[1] Coldstream Capital Management, Inc., marketed as “Coldstream Wealth Management” (the “Advisor”), has contractually agreed to waive a portion or all of its management fees and pay Fund expenses in order to ensure Total Annual Fund Operating Expenses (excluding acquired fund fees and expenses (“AFFE”), taxes, interest expense 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 July 29, 2021, and may be terminated only by the Board of Trustees (the “Board”). The Advisor may request recoupment of previously waived fees and expenses from the Fund for 36 months from the date they were waived or paid, subject to the Expense Cap.