Document and Entity Information - shares	3 Months Ended
	Oct. 31, 2018	Nov. 28, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	COPART INC
Entity Central Index Key	0000900075
Current Fiscal Year End Date	--07-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Document Type	10-Q
Document Period End Date	Oct. 31, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus (i.e. Q1,Q2,Q3,FY)	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		234,015,480