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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Feb. 28, 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 Dec. 11, 2019
Document Effective Date dei_DocumentEffectiveDate Dec. 11, 2019
Prospectus Date rr_ProspectusDate Jun. 28, 2019
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Pzena Emerging Markets Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Pzena Emerging Markets Value Fund
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Pzena Emerging Markets Value Fund
A series of Advisors Series Trust

Investor Class PZVEX
Institutional Class PZIEX

Supplement to the Prospectus dated June 28, 2019


Effective December 12, 2019, Pzena Investment Management, LLC (the “Adviser”), investment adviser of the Pzena Emerging Markets Value Fund (the “Fund” or “Emerging Markets Fund”), has contractually agreed to reduce the Fund’s Expense Cap to 1.08% (the “Expense Cap”). The Expense Cap will be in place at least through June 27, 2021.

Prospectus

In connection with this reduction, the “Fees and Expenses of the Fund” section on page 15 of the Prospectus is 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 Emerging Markets 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 6/27/2021
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 and Expense Reimbursement provided in the Financial Highlights section of the statutory prospectus, which reflects the actual operating expenses of the Emerging Markets Fund and does not include 0.01% that is 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 Emerging Markets 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 for future reference.
Pzena Emerging Markets Value Fund | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PZVEX
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
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 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.62% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.18%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.44%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 147
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 494
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 864
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,907
Pzena Emerging Markets Value Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PZIEX
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Component1 Other Expenses rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.27% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.18%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.09%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 111
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 385
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 680
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,518
[1] Total Annual Fund Operating Expenses do not correlate to the Ratio of Expenses to Average Net Assets Before Fee Waivers and Expense Reimbursement provided in the Financial Highlights section of the statutory prospectus, which reflects the actual operating expenses of the Emerging Markets Fund and does not include 0.01% that is attributed to acquired fund fees and expenses (“AFFE”).
[2] Pzena Investment Management, LLC (the “Adviser”) has contractually agreed to waive a portion or all of its management fees and pay Emerging Markets Fund expenses to ensure that Total Annual Fund Operating Expenses (excluding AFFE, interest expense, taxes, dividends on securities sold short, extraordinary expenses, Rule 12b-1 fees, shareholder servicing fees, and any other class-specific expenses) do not exceed 1.08% of average daily net assets of the Fund (the “Expense Cap”). The Expense Cap will remain in effect through at least June 27, 2021, and may be terminated only by the Trust’s Board of Trustees (the “Board”). The Adviser may request recoupment of previously waived fees and paid expenses from the Fund for 36 months from the date they were waived and paid, subject to the Expense Cap.