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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Jul. 31, 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 Sep. 13, 2019
Document Effective Date dei_DocumentEffectiveDate Sep. 13, 2019
Prospectus Date rr_ProspectusDate Nov. 28, 2018
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
O’Shaughnessy Market Leaders Value Fund
Class I - OFVIX
O’Shaughnessy Small Cap Value Fund
Class I - OFSIX
O’Shaughnessy Small/Mid Cap Growth Fund
Class I - OFMIX

Series of Advisors Series Trust

Supplement to the Prospectus and Statement of Additional Information (“SAI”), each dated November 28, 2018, as supplemented

Effective immediately, the O’Shaughnessy Market Leaders Value Fund, the O’Shaughnessy Small Cap Value Fund and the O’Shaughnessy Small/Mid Cap Growth Fund will no longer charge a redemption fee on Class I shares redeemed within 90 calendar days of purchase.

All references contained in the Prospectus and SAI to the redemption fee are hereby removed.
Supplement Closing [Text Block] ck0001027596_SupplementClosingTextBlock
Please retain this Supplement with your Prospectus and SAI for future reference.
O'Shaughnessy Market Leaders Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading O’Shaughnessy Market Leaders Value Fund
O'Shaughnessy Market Leaders Value Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol OFVIX
O'Shaughnessy Small Cap Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading O’Shaughnessy Small Cap Value Fund
O'Shaughnessy Small Cap Value Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol OFSIX
O'Shaughnessy Small/Mid Cap Growth Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading O’Shaughnessy Small/Mid Cap Growth Fund
O'Shaughnessy Small/Mid Cap Growth Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol OFMIX