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Document and Entity Information (USD $)
 12 Months Ended
Jul. 31, 2013
Sep. 30, 2013
Jan. 31, 2013
Document and Entity Information [Abstract]      
Entity Registrant Name COPART INC    
Entity Central Index Key 0000900075    
Trading Symbol cprt    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Current Fiscal Year End Date --07-31    
Entity Filer Category Large Accelerated Filer    
Entity Well-Known Seasoned Issuer Yes    
Entity Common Stock, Shares Outstanding   125,515,179  
Entity Public Float     $ 3,808,774,974
Document Type 10-K    
Document Period End Date Jul. 31, 2013    
Amendment Flag false    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus FY