Document and Entity Information
9 Months Ended
Jun. 30, 2015
Aug. 04, 2015
Document and Entity Information    
Entity Registrant Name LIQUIDITY SERVICES INC  
Entity Central Index Key 0001235468  
Document Type 10-Q  
Document Period End Date Jun. 30, 2015  
Amendment Flag false  
Current Fiscal Year End Date --09-30  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   30,026,223
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q3