Consolidated Statements of Stockholders' Equity Statement (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Balance, Value at Jan. 28, 2012	$ 1,493,012	$ 2,269	$ 788,895	$ (62,262)	$ 635	$ 763,475
Balance, Shares at Jan. 28, 2012		226,864
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	786,763					786,763
Unrealized investment gain (loss), net	(50)				(50)
Common stock issued under stock plans, net of shares used for tax withholding, Shares		1,315
Common stock issued under stock plans, net of shares used for tax withholding, Value	(10,403)	13	19,030	(29,446)
Tax benefit from equity issuance	29,989		29,989
Stock-based compensation	48,952		48,952
Common stock repurchased, Shares		(7,458)
Common stock repurchased, Value	(450,000)	(75)	(20,347)			(429,578)
Dividends declared	(131,400)					(131,400)
Balance, Value at Feb. 02, 2013	1,766,863	2,207	866,519	(91,708)	585	989,260
Balance, Shares at Feb. 02, 2013		220,721
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	837,304					837,304
Unrealized investment gain (loss), net	(196)				(196)
Common stock issued under stock plans, net of shares used for tax withholding, Shares		878
Common stock issued under stock plans, net of shares used for tax withholding, Value	(10,777)	9	19,065	(29,851)
Tax benefit from equity issuance	27,661		27,661
Stock-based compensation	46,847		46,847
Common stock repurchased, Shares		(8,179)
Common stock repurchased, Value	(550,000)	(82)	(24,501)			(525,417)
Dividends declared	(110,400)					(110,400)
Balance, Value at Feb. 01, 2014	2,007,302	2,134	935,591	(121,559)	389	1,190,747
Balance, Shares at Feb. 01, 2014		213,420
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	924,724					924,724
Unrealized investment gain (loss), net	(59)				(59)
Common stock issued under stock plans, net of shares used for tax withholding, Shares		1,453
Common stock issued under stock plans, net of shares used for tax withholding, Value	(17,063)	15	21,963	(39,041)
Tax benefit from equity issuance	29,759		29,759
Stock-based compensation	53,001		53,001
Common stock repurchased, Shares		(7,403)
Common stock repurchased, Value	(550,000)	(74)	(24,633)			(525,293)
Dividends declared	(168,454)					(168,454)
Balance, Value at Jan. 31, 2015	$ 2,279,210	$ 2,075	$ 1,015,681	$ (160,600)	$ 330	$ 1,421,724
Balance, Shares at Jan. 31, 2015		207,470