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Discontinued Operations (Details) (USD $) In Millions	9 Months Ended
	Apr. 30, 2009
Discontinued Operations and Disposal Groups [Abstract]
Early payment of the note receivable	$ 12

X

- Definition

Represents the cash received on prepayment of notes receivable, received on disposal of discontinued operations.

+ Details

Name:	cprt_PrepaymentOfNotesReceivableOnDisposalGroupIncludingDiscontinuedOperations
Namespace Prefix:	cprt
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration