Document and Entity Information
3 Months Ended
Dec. 31, 2014
Feb. 03, 2015
Document and Entity Information    
Entity Registrant Name LIQUIDITY SERVICES INC  
Entity Central Index Key 0001235468  
Document Type 10-Q  
Document Period End Date Dec. 31, 2014  
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   29,978,283
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1