Represents amortization of notional amount for derivative over the specified period.

No definition available.

Name:	cprt_AmortizationOfNotionalAmountOverSpecifiedPeriod
Namespace Prefix:	cprt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents a ratio used to calculate the financial leverage of an entity to understand methods of financing or to measure its ability to meet financial obligations.

+ References

No definition available.

+ Details

Name:	cprt_LeverageRatio
Namespace Prefix:	cprt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate on specific date.

+ References

No definition available.

+ Details

Name:	cprt_ReferenceRate
Namespace Prefix:	cprt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Long-Term Debt (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended		0 Months Ended	6 Months Ended		0 Months Ended	6 Months Ended
	Jan. 31, 2014	Jan. 31, 2014 Revolving Credit Facility	Mar. 01, 2013 Revolving Credit Facility Minimum	Jan. 31, 2014 Revolving Credit Facility Minimum	Sep. 29, 2011 Revolving Credit Facility Minimum	Mar. 01, 2013 Revolving Credit Facility Maximum	Jan. 31, 2014 Revolving Credit Facility Maximum	Sep. 29, 2011 Revolving Credit Facility Maximum	Jan. 31, 2014 Alternative currency borrowing credit facility	Jan. 31, 2014 Letter of Credit	Jan. 31, 2014 Term Loan Facility	Jan. 31, 2014 Term Loan Facility Original Limit	Jan. 14, 2011 Term Loan Facility Original Limit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 100.0			$ 400.0			$ 500.0	$ 100.0	$ 50.0		$ 400.0	$ 400.0
Net leverage ratio			1:1			1.5:1
Outstanding borrowings											331.3
Quarterly payments for term loan											$ 18.8
Maturity date		Dec. 14, 2015
Reference rate basis	(i) the Eurocurrency Rate; (ii) the Federal Funds Rate; or (iii) the Prime Rate as described in the Credit Facility
Reference rate	0.17%
Applicable interest rate added to reference rate in order to compute variable interest rate	1.50%			1.50%			2.00%
Commitment fee percentage				0.075%			0.125%
Line of credit facility interest rate during period	2.00%