Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Sales	$ 6,649,237	$ 6,182,184	$ 5,788,816
Cost of goods sold, including warehouse and distribution expenses	3,280,236	3,084,766	2,951,467
Gross profit	3,369,001	3,097,418	2,837,349
Selling, general and administrative expenses	2,265,516	2,120,025	1,973,381
Former CSK officer clawback	0	0	(2,798)
Operating income	1,103,485	977,393	866,766
Other income (expense):
Interest expense	(49,074)	(40,200)	(28,165)
Interest income	1,992	2,441	2,245
Write-off of asset-based revolving credit facility debt issuance costs	0	0	(21,626)
Termination of interest rate swap agreements	0	0	(4,237)
Other, net	2,539	1,887	790
Total other expense	(44,543)	(35,872)	(50,993)
Income before income taxes	1,058,942	941,521	815,773
Provision for income taxes	388,650	355,775	308,100
Net income	$ 670,292	$ 585,746	$ 507,673
Earnings per share-basic:
Earnings per share - basic	$ 6.14	$ 4.83	$ 3.77
Weighted-average common shares outstanding - basic	109,244	121,182	134,667
Earnings per share-assuming dilution:
Earnings per share - assuming dilution	$ 6.03	$ 4.75	$ 3.71
Weighted-average common shares outstanding - assuming dilution	111,101	123,314	136,983