Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 05, 2012 Store	May 07, 2011	May 05, 2012 ReportableSegment OperatingSegment Store	May 07, 2011
Net Sales
Net sales	$ 2,111,866	$ 1,978,369	$ 5,840,277	$ 5,430,977
Segment Profit
Gross profit	1,089,799	1,013,530	2,999,641	2,766,889
Operating, selling, general and administrative expenses	(662,549)	(620,605)	(1,930,806)	(1,796,095)
Interest expense, net	(39,743)	(39,916)	(117,760)	(116,745)
Income before income taxes	387,507	353,009	951,075	854,049
Segment Reporting (Textual) [Abstract]
Number of operating segments			2
Number of reportable segments			1
Number of automotive parts and accessories stores in the United States, including Puerto Rico and Mexico	4,910		4,910
Auto Parts Stores [Member]
Net Sales
Net sales	2,068,643	1,939,094	5,715,683	5,318,031
Segment Profit
Gross profit	1,056,587	983,256	2,903,437	2,678,814
Other [Member]
Net Sales
Net sales	43,223	39,275	124,594	112,946
Segment Profit
Gross profit	$ 33,212	$ 30,274	$ 96,204	$ 88,075