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Document and Entity Information
 6 Months Ended
Jan. 31, 2015
Mar. 03, 2015
Document and Entity Information [Abstract]    
Entity Registrant Name COPART INC  
Entity Central Index Key 0000900075  
Amendment Flag false  
Current Fiscal Year End Date --07-31  
Document Type 10-Q  
Document Fiscal Year Focus 2015  
Document Period End Date Jan. 31, 2015  
Document Fiscal Period Focus Q2  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   126,439,552dei_EntityCommonStockSharesOutstanding