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Legal Proceedings (Details) (USD $) In Millions, unless otherwise specified | Jan. 31, 2015
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Legal Proceedings [Abstract] |
Sales tax including penalties and interest expense | $ 73.8 cprt_SalesTaxesPenaltiesAndInterestPayable

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- Definition The amount of the sales tax including penalties and interest raised on demand by the state authorities after performing audit. + References No definition available. + Details
Name: | cprt_SalesTaxesPenaltiesAndInterestPayable
Namespace Prefix: | cprt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration