v3.19.3.a.u2
Cover Page - shares
3 Months Ended
Dec. 31, 2019
Feb. 03, 2020
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Dec. 31, 2019  
Document Transition Report false  
Entity File Number 0-51813  
Entity Registrant Name LIQUIDITY SERVICES, INC  
Entity Incorporation, State or Country Code DE  
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  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   33,988,798
Entity Central Index Key 0001235468  
Amendment Flag false  
Current Fiscal Year End Date --09-30  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1