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Employee Benefit Plan (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2011 | Jul. 31, 2010 | Jul. 31, 2009
United States Defined Contribution Plan |  |  |
Defined Contribution Plans [LineItem] |  |  |
Recognized Deferred Compensation expenses | $ 0.4 | $ 0.5 | $ 0.5
Defined Contribution Plan, Contributions by Employer, Percentage | 20.00% |  |
Maximum Employer Contribution on employees salary deferral | 15.00% |  |
Uk Based Defined Contribution Plans |  |  |
Defined Contribution Plans [LineItem] |  |  |
Recognized Deferred Compensation expenses | $ 0.2 | $ 0.3 | $ 0.7
Defined Contribution Plan, Contributions by Employer, Percentage | 5.00% |  |

X
- Definition The increase in the fair value of plan assets from contributions made by the employer in percent. + Details
Name: | cprt_DefinedContributionPlanContributionsByEmployerPercentage
Namespace Prefix: | cprt
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | cprt_EmployeeBenefitPlanLineItem
Namespace Prefix: | cprt
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The Percantage of the Maximum Employer Contribution on employees salary deferral for defined contribution plans. + Details
Name: | cprt_MaximumEmployerContributionOnEmployeesSalaryDeferralPercentage
Namespace Prefix: | cprt
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration