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Common Stock Repurchases (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Sep. 22, 2011
Stock Repurchase [Abstract]
Additional common stock authorized for repurchase (in shares)			40,000,000cprt_StockRepurchaseProgramAdditionalNumberOfSharesAuthorizedApproved
Common stock authorized for repurchase (in shares)			98,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Number of shares repurchased under the program	50,286,782cprt_AggregateNumberOfSharesPurchasedUnderStockRepurchaseProgram
Number of shares available for repurchase under stock repurchase program	47,713,218us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Dilutive earnings per share, Impact of repurchase shares on the weighted average common shares outstanding (in dollars per share)	$ 0.01cprt_DilutiveEarningsPerShareImpactOfRepurchaseShares
Remittance to taxing authorities under statutory withholding	$ 1.1us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	$ 0.1us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

X

- Definition

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

+ References

No definition available.

+ Details

Name:	cprt_AggregateNumberOfSharesPurchasedUnderStockRepurchaseProgram
Namespace Prefix:	cprt_
Data Type:	xbrli:sharesItemType
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

Name:	cprt_StockRepurchaseAbstract
Namespace Prefix:	cprt_
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

Name:	cprt_StockRepurchaseProgramAdditionalNumberOfSharesAuthorizedApproved
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

Name:	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
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

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
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

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