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Related Party Transactions (Details Textuals) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Jul. 31, 2012
Houses
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2012
Board of Directors and Officers
Jul. 31, 2011
Board of Directors and Officers
Jul. 31, 2010
Board of Directors and Officers
Jun. 10, 2010
Willis J. Johnson
Jun. 28, 2012
Willis J. Johnson
Jul. 31, 2012
Executives
Houses
Jul. 31, 2011
Executives
Houses
Jul. 31, 2011
Willis Johnson Foundation
Jul. 31, 2012
Thomas W. Smith
Jul. 31, 2012
Copart Private Foundation
Related Party Transactions, By Related Party [Abstract]                          
Rental payments       $ 0 $ 50,000 $ 200,000              
Acquired common stock, value (199,897,000) (735,402,000) (4,457,000)       4,500,000 65,000,000     500,000 13,900,000  
Acquired common stock, shares             242,502 2,800,000     10,620 500,000  
Acquired Common stock, Price Per Shares (in dollars per share)             $ 18.38 $ 23.22       $ 27.77  
Related party transaction number of houses purchased                 3 3      
Number of assets held for sale 1                        
Loan to related party                         $ 200,000