Long-Term Debt (Details) - Second Amended and Restated Credit Agreement		12 Months Ended
	Dec. 21, 2021 USD ($)	Jul. 31, 2025 USD ($)	Jul. 31, 2024 USD ($)	Dec. 20, 2021 USD ($)
Revolving Credit Facility
Line of Credit Facility [Line Items]
Outstanding borrowings		$ 0	$ 0
Maximum leverage	$ 50,000,000
Minimum liquidity	75,000,000
Total consolidated net leverage ratio		(2.35)
Minimum liquidity requirement		$ 6,000,000,000
Debt issuance fees	$ 2,700,000
Revolving Credit Facility | Scenario 1
Line of Credit Facility [Line Items]
Line of credit facility, covenant terms	3.25
Revolving Credit Facility | Scenario 2
Line of Credit Facility [Line Items]
Line of credit facility, covenant terms	3.50
Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Commitment fee rate (as a percent)		0.175%
Revolving Credit Facility | Minimum | Base Rate
Line of Credit Facility [Line Items]
Commitment fee rate (as a percent)		1.00%
Revolving Credit Facility | Minimum | Daily Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate (as a percent)		0.00%
Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Commitment fee rate (as a percent)		0.275%
Revolving Credit Facility | Maximum | Base Rate
Line of Credit Facility [Line Items]
Commitment fee rate (as a percent)		1.75%
Revolving Credit Facility | Maximum | Daily Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate (as a percent)		0.75%
Revolving Credit Facility | Wells Fargo, National Association, Trust Bank, BMO Harris Bank N.A., Santander Bank N.A., and Bank of America, N.A.
Line of Credit Facility [Line Items]
Increase in credit facility	$ 200,000,000
Maximum borrowing capacity	1,250,000,000
Outstanding borrowings	100,000,000			$ 60,000,000
Letter of Credit | Wells Fargo, National Association, Trust Bank, BMO Harris Bank N.A., Santander Bank N.A., and Bank of America, N.A.
Line of Credit Facility [Line Items]
Maximum borrowing capacity	550,000,000
Letter of Credit | Wells Fargo, National Association, Trust Bank, BMO Harris Bank N.A., Santander Bank N.A., and Bank of America, N.A. | CPRT GmbH
Line of Credit Facility [Line Items]
Maximum borrowing capacity	150,000,000
Letter of Credit | Wells Fargo, National Association, Trust Bank, BMO Harris Bank N.A., Santander Bank N.A., and Bank of America, N.A. | Copart Autos España, S.L.U.
Line of Credit Facility [Line Items]
Maximum borrowing capacity	150,000,000
Letter of Credit | Wells Fargo, National Association, Trust Bank, BMO Harris Bank N.A., Santander Bank N.A., and Bank of America, N.A. | Copart UK Limited
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 250,000,000