Long-Term Debt - Narrative (Details)			12 Months Ended
	May 24, 2022 USD ($)	Dec. 21, 2021 USD ($)	Jul. 31, 2024 USD ($)	Jul. 31, 2023 USD ($)	Jul. 31, 2022 USD ($)	Dec. 20, 2021 USD ($)	Dec. 03, 2014 USD ($)
Line of Credit Facility [Line Items]
Debt instrument costs			$ 0	$ 0	$ 1,212,000
Senior Notes
Line of Credit Facility [Line Items]
Repayments of senior notes	$ 420,600,000
Make whole payment	16,800,000
Accrued interest	$ 3,800,000
Note Purchase Agreement | Senior Notes
Line of Credit Facility [Line Items]
Senior notes							$ 400,000,000.0
4.07% Senior Notes, Series A | Senior Notes
Line of Credit Facility [Line Items]
Senior notes							$ 100,000,000.0
Stated interest rate							4.07%
4.19% Senior Notes, Series B | Senior Notes
Line of Credit Facility [Line Items]
Senior notes							$ 100,000,000.0
Stated interest rate							4.19%
4.25% Senior Notes, Series C | Senior Notes
Line of Credit Facility [Line Items]
Senior notes							$ 100,000,000.0
Stated interest rate							4.25%
4.35% Senior Notes, Series D | Senior Notes
Line of Credit Facility [Line Items]
Senior notes							$ 100,000,000.0
Stated interest rate							4.35%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt instrument costs		$ 2,700,000
Revolving Credit Facility | Second Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Outstanding borrowings			$ 0	$ 11,000,000
Covenant maximum leverage amount		50,000,000
Covenant minimum liquidity amount		$ 75,000,000
Total consolidated net leverage ratio			(1.81)
Minimum liquidity			$ 4,600,000,000
Revolving Credit Facility | Second Amended and Restated Credit Agreement | Scenario 1
Line of Credit Facility [Line Items]
Total net leverage ratio		3.25
Revolving Credit Facility | Second Amended and Restated Credit Agreement | Scenario 2
Line of Credit Facility [Line Items]
Total net leverage ratio		3.50
Revolving Credit Facility | Second Amended and Restated Credit Agreement | Minimum
Line of Credit Facility [Line Items]
Commitment fee rate range			0.175%
Revolving Credit Facility | Second Amended and Restated Credit Agreement | Minimum | Base Rate
Line of Credit Facility [Line Items]
Commitment fee rate range			1.00%
Revolving Credit Facility | Second Amended and Restated Credit Agreement | Minimum | Daily Rate
Line of Credit Facility [Line Items]
Applicable interest rate added to reference rate in order to compute variable interest rate			0.00%
Revolving Credit Facility | Second Amended and Restated Credit Agreement | Maximum
Line of Credit Facility [Line Items]
Commitment fee rate range			0.275%
Revolving Credit Facility | Second Amended and Restated Credit Agreement | Maximum | Base Rate
Line of Credit Facility [Line Items]
Commitment fee rate range			1.75%
Revolving Credit Facility | Second Amended and Restated Credit Agreement | Maximum | Daily Rate
Line of Credit Facility [Line Items]
Applicable interest rate added to reference rate in order to compute variable interest rate			0.75%
Revolving Credit Facility | Second Amended and Restated Credit Agreement | WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A.
Line of Credit Facility [Line Items]
Increase in credit facility		$ 200,000,000
Maximum borrowing capacity		1,250,000,000
Letter of Credit | Second Amended and Restated Credit Agreement | WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A.
Line of Credit Facility [Line Items]
Maximum borrowing capacity		550,000,000
Letter of Credit | Second Amended and Restated Credit Agreement | WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. | CPRT GmbH
Line of Credit Facility [Line Items]
Maximum borrowing capacity		150,000,000
Letter of Credit | Second Amended and Restated Credit Agreement | WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. | Copart Autos España, S.L.U.
Line of Credit Facility [Line Items]
Maximum borrowing capacity		150,000,000
Letter of Credit | Second Amended and Restated Credit Agreement | WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. | Copart UK Limited
Line of Credit Facility [Line Items]
Maximum borrowing capacity		250,000,000
Letter of Credit, Sublimit | Second Amended and Restated Credit Agreement | WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A.
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 100,000,000				$ 60,000,000