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

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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