General - Additional Information (Detail)	9 Months Ended
	May 10, 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 and thirty-six weeks ended May 10, 2014, are not necessarily indicative of the results that may be expected for the fiscal year ending August 30, 2014. 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 quarter for fiscal 2014 has 16 weeks and for fiscal 2013 had 17 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