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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) |  |  | 40,000,000 cprt_StockRepurchaseProgramAdditionalNumberOfSharesAuthorizedApproved
Common stock authorized for repurchase (in shares) |  |  | 98,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Number of shares repurchased under the program | 50,286,782 cprt_AggregateNumberOfSharesPurchasedUnderStockRepurchaseProgram |  |
Number of shares available for repurchase under stock repurchase program | 47,713,218 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |
Dilutive earnings per share, Impact of repurchase shares on the weighted average common shares outstanding (in dollars per share) | $ 0.01 cprt_DilutiveEarningsPerShareImpactOfRepurchaseShares |  |
Remittance to taxing authorities under statutory withholding | $ 1.1 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | $ 0.1 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation |

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- 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

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- 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

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- 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