Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
Document Type	dei_DocumentType	Other
Document Period End Date	dei_DocumentPeriodEndDate	Sep. 26, 2012
Registrant Name	dei_EntityRegistrantName	ADVISORS SERIES TRUST
Central Index Key	dei_EntityCentralIndexKey	0001027596
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Sep. 26, 2012
Document Effective Date	dei_DocumentEffectiveDate	Sep. 26, 2012
Kellner Merger Fund (Prospectus Summary) | Kellner Merger Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GAKIX
Kellner Merger Fund (Prospectus Summary) | Kellner Merger Fund | Institutional Class
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GAKNX