General - Additional Information (Detail)	9 Months Ended
	May 09, 2015
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Description of reporting periods	Operating results for the twelve and thirty-six weeks ended May 9, 2015, 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.
First Quarter [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Quarter period of fiscal year	84 days
Second Quarter [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Quarter period of fiscal year	84 days
Third Quarter [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Quarter period of fiscal year	84 days
Fourth Quarter [Member] | Minimum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Quarter period of fiscal year	112 days
Fourth Quarter [Member] | Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Quarter period of fiscal year	119 days