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Income Taxes (Details) $ in Millions	9 Months Ended
	Apr. 30, 2016 USD ($)
Income Tax Disclosure [Abstract]
Tax benefits recognized provided percentage of likelihood of realization is more than	50.00%
Gross unrecognized tax benefit	$ 25.7

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

- References

No definition available.

+ 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.

+ References

Reference 1: 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=65882285&loc=SL6600010-109319

Reference 2: 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

+ Details

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