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Common Stock Repurchases (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Sep. 22, 2011
Stock Repurchase [Abstract]
Additional common stock authorized for repurchase (in shares)			40,000,000
Common stock authorized for repurchase (in shares)			98,000,000
Number of shares repurchased under the program	50,286,782
Number of shares available for repurchase under Stock Repurchase Program	47,713,218
Dilutive earnings per share, Impact of repurchase shares on the weighted average common shares outstanding (in dollars per share)	$ 0.01
Remittance to taxing authorities under statutory withholding	$ 1.1	$ 0.1

X

- Definition

The total number of shares repurchased under the program as if the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	cprt_
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Balance Type:	na
Period Type:	instant

X

- Definition

The dilutive earnings per share impact of all repurchased shares on the weighted average number of common shares outstanding during the period.

+ References

No definition available.

+ Details

Name:	cprt_DilutiveEarningsPerShareImpactOfRepurchaseShares
Namespace Prefix:	cprt_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

The number additional shares approved under company's stock repurchase program by the entity's board of directors.

+ References

No definition available.

+ Details

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Namespace Prefix:	cprt_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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