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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Income Taxes [Abstract]
Gross unrecognized tax benefit	$ 25.5us-gaap_UnrecognizedTaxBenefits
Interest and penalties related to income tax	$ 0.8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	$ 0.8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Tax benefits recognized provided percentage of likelihood of realization is more than	50.00%cprt_TaxBenefitsRecognizedProvidedPercentageOfLikelihoodOfRealizationMoreThan

X

- Definition

Represents the tax benefits recognized provided percentage of likelihood of realization is more than during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	cprt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ 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

+ Details

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Balance Type:	debit
Period Type:	duration