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Common Stock Repurchases (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jan. 31, 2015		Jan. 31, 2014
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised	(391)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Exercise Price	$ 19.70us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Common Stock [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised	201,333us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember		14,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Exercise Price	$ 19.59us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember		$ 16.43us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Shares Net Settled for Exercise	124,621cprt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodSharesNetSettledForExercise / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember		7,241cprt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodSharesNetSettledForExercise / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Shares Withheld for Taxes	35,416cprt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodSharesWithheldForTaxes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember	[1]	2,519cprt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodSharesWithheldForTaxes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember	[1]
Net Shares to Employee	41,296us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember		4,240us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Share Price for Withholding	$ 31.65cprt_SharePriceForWithholding / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember		$ 31.77cprt_SharePriceForWithholding / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Tax Withholding (in 000s)	$ 1,121cprt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWithholdingTaxesValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember		$ 80cprt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWithholdingTaxesValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
[1] Shares withheld for taxes are treated as a repurchase of shares for accounting purposes but do not count against the Company's stock repurchase program.

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- Definition

Represents the number of net impact on number of shares settled resulting from exercise.

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No definition available.

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- Definition

Represents the number of shares withheld for taxes.

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Amount of Tax Expenses Paid by Company releated to the Share-based Compensation to the taxing authority.

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No definition available.

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The price per shares for withholding for taxes.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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