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Cover
Feb. 08, 2021
Feb. 04, 2021
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Feb. 08, 2021  
Entity Registrant Name   LIQUIDITY SERVICES, INC.
Entity Incorporation, State or Country Code DE  
Entity File Number 0-51813  
Entity Tax Identification Number 52-2209244  
Entity Address, Address Line One 6931 Arlington Road, Suite 200  
Entity Address, City or Town Bethesda  
Entity Address, State or Province MD  
Entity Address, Postal Zip Code 20814  
City Area Code (202)  
Local Phone Number 467-6868  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Entity Emerging Growth Company false  
Entity Central Index Key 0001235468  
Amendment Flag false  
Title of 12(b) Security Common Stock, $0.001 par value  
Trading Symbol LQDT  
Security Exchange Name NASDAQ