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Leases Balance Sheet Presentation of Operating and Financing Lease Assets and Liabilities (Details) - USD ($) $ in Thousands | Jul. 31, 2021 | Jul. 31, 2020
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Lessee, Lease, Description [Line Items] |  |
Operating lease right-of-use assets | $ 119,487 | $ 118,455
Finance Lease, Right-of-Use Asset, after Accumulated Amortization | 563 | 1,409
Lease Assets, net | 120,050 | 119,864
Lease liabilities | $ 120,433 | $ 121,722

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- Definition Total operating and finance lease right-of-use assets and balance sheet presentation. + References No definition available. + Details
Name: | cprt_LeaseAssetsnet
Namespace Prefix: | cprt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total operating and finance lease right-of-use liabilities and balance sheet presentation. + References No definition available. + Details
Name: | cprt_Leaseliabilities
Namespace Prefix: | cprt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
Name: | us-gaap_FinanceLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant