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Goodwill (Details Textuals) (USD $) In Millions, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011
Goodwill [Abstract]
Goodwill impairment losses	$ 21.8	$ 21.8

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- Details

Name:	cprt_GoodwillAbstract
Namespace Prefix:	cprt_
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- Definition

The accumulated impairment losses related to goodwill as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

+ Details

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