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Stock-based Compensation (Details Textuals)	Jan. 31, 2012
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]
Shares available for calculating intrinsic value (in shares)	8,507,648

X

- Definition

The number of stock options in-the-money as of the balance-sheet date. A stock option is said to be in-the-money when the price of the underlying instrument surpasses the strike price.

+ References

No definition available.

+ Details

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

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- Details

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