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Cash, Cash Equivalents and Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified | Jul. 31, 2012 | Jul. 31, 2011
--- | --- | ---
Cash and Cash Equivalents and Marketable Securities [Line Items] |  |
Cost | $ 140,112 | $ 74,009
Unrealized Gains |  |
Unrealized Losses Less Than 12 Months |  |
Unrealized Losses 12 Months or Longer |  |
Estimated Fair Value | 140,112 | 74,009
Cash |  |
Cash and Cash Equivalents and Marketable Securities [Line Items] |  |
Cost | 96,779 | 42,664
Unrealized Gains |  |
Unrealized Losses Less Than 12 Months |  |
Unrealized Losses 12 Months or Longer |  |
Estimated Fair Value | 96,779 | 42,664
Money Market Funds |  |
Cash and Cash Equivalents and Marketable Securities [Line Items] |  |
Cost | 43,333 | 31,345
Unrealized Gains |  |
Unrealized Losses Less Than 12 Months |  |
Unrealized Losses 12 Months or Longer |  |
Estimated Fair Value | $ 43,333 | $ 31,345

X
- Definition Represents cash and cash equivalents and marketable securities at carrying value. + References No definition available. + Details
Name: | cprt_CashAndCashEquivalentsAndMarketableSecuritiesAtCarryingValue
Namespace Prefix: | cprt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty and marketable securities. + References No definition available. + Details
Name: | cprt_CashAndCashEquivalentsAndMarketableSecuritiesAtFairValue
Namespace Prefix: | cprt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition This element represents the portion of Unrealized Gains related to cash and cash equivalents and Marketable Securities. + References No definition available. + Details
Name: | cprt_UnrealizedGainsCashAndCashEquivalentsAndMarketableSecurities
Namespace Prefix: | cprt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the portion of Unrealized Losses Less Than Twelve Months related to cash and cash equivalents and Marketable Securities. + References No definition available. + Details
Name: | cprt_UnrealizedLossesLessThanTwelveMonthsCashAndCashEquivalentsAndMarketableSecurities
Namespace Prefix: | cprt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the portion of Unrealized Losses Twelve Months Or Longer related to cash and cash equivalents and Marketable Securities. + References No definition available. + Details
Name: | cprt_UnrealizedLossesTwelveMonthsOrLongerCashAndCashEquivalentsAndMarketableSecurities
Namespace Prefix: | cprt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant