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Long-Term Debt Leverage Ratios (Details)	9 Months Ended
	Apr. 30, 2019
Leverage Ratios [Abstract]
Total Consolidated Net Leverage Ratio	43.00%

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- Definition

Total Consolidated Net Leverage Ratio

+ References

No definition available.

+ Details

Name:	cprt_TotalConsolidatedNetLeverageRatio
Namespace Prefix:	cprt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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