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Long-Term Debt (Detail Textuals) (USD $) In Millions, unless otherwise specified	6 Months Ended	1 Months Ended	6 Months Ended
	Jan. 31, 2013	Mar. 31, 2013 Subsequent Event	Jan. 31, 2013 Revolving Credit Facility	Jan. 31, 2013 Revolving Credit Facility Minimum	Jan. 31, 2013 Revolving Credit Facility Maximum	Jan. 31, 2013 Alternative currency borrowing credit facility	Jan. 31, 2013 Letter of Credit	Jan. 31, 2013 Term Loan Facility	Jan. 31, 2013 Original Limit Term Loan Facility	Jan. 14, 2011 Original Limit Term Loan Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 100.0			$ 100.0	$ 50.0	$ 500.0	$ 400.0	$ 400.0
Net leverage ratio	1:1	1.5:1
Outstanding borrowings								406.3
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
Reference rate	0.21%
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%

X

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- 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

X

- 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

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

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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X

- 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.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- 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

X

- 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

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X

- 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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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Balance Type:	credit
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X

- 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

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