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Document and Entity Information - USD ($)
 12 Months Ended
Jul. 31, 2017
Sep. 26, 2017
Jan. 31, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name COPART INC    
Entity Central Index Key 0000900075    
Current Fiscal Year End Date --07-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Jul. 31, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Amendment Flag false    
Trading Symbol cprt    
Entity Common Stock, Shares Outstanding   230,773,342  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 5,644,908,664