Cover Page - USD ($)	12 Months Ended
	Aug. 31, 2019	Oct. 21, 2019	Feb. 09, 2019
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Aug. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	AUTOZONE INC
Entity Central Index Key	0000866787
Current Fiscal Year End Date	--08-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 21,723,299,587
Trading Symbol	AZO
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common Stock
Security Exchange Name	NYSE
Entity Address, State or Province	TN
Entity Common Stock, Shares Outstanding		23,827,496