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Commitments and Contingencies (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Major Operating and Capital Expenses [Abstract]
Outstanding letters of credit	$ 6.7
Notice of proposed assessment for uncollected sales tax including interest and penalties	73.8
Environmental matters remedition expenses reserves	3.0
Environmental matters cover costs	0.2
Facilities Rental Expense
Major Operating and Capital Expenses [Abstract]
Rental expense	16.2	17.4	16.8
Yard Operations Equipment Rental Expense
Major Operating and Capital Expenses [Abstract]
Rental expense	$ 2.7	$ 3.3	$ 4.1

X

- Definition

Amount held by the company to cover the cost.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount held for remediation expenses reserves.

+ References

No definition available.

+ Details

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Namespace Prefix:	cprt_
Data Type:	xbrli:monetaryItemType
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X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount borrowed under the letter of credit facility as of the balance-sheet date

+ References

No definition available.

+ Details

Name:	cprt_OutstandingLettersOfCredit
Namespace Prefix:	cprt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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X

- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

+ References

No definition available.

+ Details

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