Document and Entity Information - shares	8 Months Ended
	May 04, 2019	May 31, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	May 04, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Registrant Name	AUTOZONE INC
Entity Central Index Key	0000866787
Current Fiscal Year End Date	--08-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	AZO
Entity Common Stock, Shares Outstanding		24,528,705
Entity Emerging Growth Company	false
Entity Small Business	false