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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2015 | Jul. 31, 2014
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Finite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | $ (15,873)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | $ (13,284)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net intangibles | 21,425 us-gaap_FiniteLivedIntangibleAssetsNet | 25,242 us-gaap_FiniteLivedIntangibleAssetsNet
Covenants not to compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 1,750 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 2,939 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Supply contracts & customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 27,829 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cprt_SupplyContractsAndCustomerRelationshipsMember | 27,986 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cprt_SupplyContractsAndCustomerRelationshipsMember
Trade name |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 5,193 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 5,791 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Licenses and databases |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 2,526 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cprt_LicensesAndDatabasesMember | $ 1,810 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cprt_LicensesAndDatabasesMember

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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