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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

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