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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Sep. 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. 13, 2020
Document Effective Date dei_DocumentEffectiveDate Apr. 13, 2020
Prospectus Date rr_ProspectusDate Jan. 28, 2020
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Scharf Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Scharf Fund
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Scharf Fund
Institutional Class
LOGIX
Retail Class
LOGRX

A series of Advisors Series Trust (the “Trust”)

Supplement to the Prospectus and Statement of Additional Information dated January 28, 2020

By unanimous written consent on March 31, 2020, at the recommendation of Scharf Investments, LLC (the “Adviser”), investment advisor of the Scharf Fund (the “Fund”), the Board of Trustees of the Trust approved an amendment to the Operating Expenses Limitation Agreement between the Trust, on behalf of the Fund, and the Adviser, pursuant to which the Adviser has agreed to reduce the Fund’s expense cap for the Fund from 0.89% to 0.79% and to lower the management fee from 0.89% to 0.78%, respectively, effective April 1, 2020. The new expense cap will be in place at least through April 1, 2021.

Prospectus

In connection with these reductions, the “Fees and Expenses of the Fund” sub-section and “Example” sub-section on page 1 of the Prospectus are hereby deleted and replaced with the following:
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 Scharf 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 04/01/2021
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 in the Financial Highlights section of the statutory prospectus, which reflects the actual operating expenses of the Scharf Fund and does not include expenses of 0.01% attributed to acquired fund fees and expenses (“AFFE”). Total Annual Fund Operating Expenses reflect the maximum Rule 12b-1 fee and/or Shareholder Servicing Plan fee allowed while the Expense Ratios in the Financial Highlights reflect actual expenses.
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 Scharf 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:
Supplement Closing [Text Block] ck0001027596_SupplementClosingTextBlock
Please retain this Supplement with the Prospectus and Statement of Additional Information.
Scharf Fund | Retail Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LOGRX
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.78%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Component1 Other Expenses rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.21%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.24% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.15%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 117
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 385
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 672
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,492
Scharf Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LOGIX
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.78%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Component1 Other Expenses rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.21%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.99% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 306
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 538
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,205
[1] Total Annual Fund Operating Expenses do not correlate to the Ratio of Expenses to Average Net Assets Before Fee Waivers in the Financial Highlights section of the statutory prospectus, which reflects the actual operating expenses of the Scharf Fund and does not include expenses of 0.01% attributed to acquired fund fees and expenses (“AFFE”). Total Annual Fund Operating Expenses reflect the maximum Rule 12b-1 fee and/or Shareholder Servicing Plan fee allowed while the Expense Ratios in the Financial Highlights reflect actual expenses.
[2] Scharf Investments, LLC (the “Adviser”) has contractually agreed to waive a portion or all of its management fees and pay Scharf Fund expenses in order to limit Total Annual Fund Operating Expenses After Fee Waiver (excluding AFFE, interest, taxes, extraordinary expenses and class-specific expenses, such as the distribution (12b-1) fee of 0.25% or shareholder servicing plan fee of 0.10%), to 0.79% of average daily net assets of the Fund (the “Expense Cap”). The Expense Cap will remain in effect through at least April 1, 2021, and may be terminated only by the Board of Trustees (the “Board”) of the Trust. The Adviser 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.