General - Additional Information (Detail)	8 Months Ended
	May 05, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of reporting periods	Operating results for the twelve and thirty-six weeks ended May 5, 2018 are not necessarily indicative of the results that may be expected for the full fiscal year ending August 25, 2018. Each of the first three quarters of AutoZone’s fiscal year consists of 12 weeks, and the fourth quarter consists of 16 or 17 weeks. The fourth quarters for fiscal 2018 and 2017 each have 16 weeks. Additionally, the Company’s business is somewhat seasonal in nature, with the highest sales generally occurring during the months of February through September and the lowest sales generally occurring in the months of December and January.