General - Additional Information (Detail)	3 Months Ended
	Nov. 22, 2014
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Period of first quarter of fiscal year	84 days
Period of second quarter of fiscal year	84 days
Period of third quarter of fiscal year	84 days
Description of reporting periods	Operating results for the twelve weeks ended November 22, 2014, are not necessarily indicative of the results that may be expected for the fiscal year ending August 29, 2015. 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 2015 and 2014 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.
Minimum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Period of fourth quarter of fiscal year	112 days
Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Period of fourth quarter of fiscal year	119 days