Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional paid-in capital	Treasury stock	Accumulated other comprehensive income (loss)	Retained earnings
Beginning balance (in shares) at Jan. 31, 2015		414,939
Beginning balance, value at Jan. 31, 2015	$ 2,279,210	$ 4,149	$ 1,013,607	$ (160,600)	$ 330	$ 1,421,724
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	1,020,661					1,020,661
Unrealized investment loss, net	(148)				(148)
Common stock issued under stock plans, net of shares used for tax withholding (in shares)		1,053
Common stock issued under stock plans, net of shares used for tax withholding, value	(48,739)	$ 11	20,175	(68,925)
Tax benefit from equity issuance	42,382		42,382
Stock-based compensation	$ 70,937		70,937
Common stock repurchased (in shares)	(13,700)	(13,653)
Common stock repurchased	$ (700,000)	$ (137)	(24,772)			(675,091)
Dividends declared	(192,312)					(192,312)
Ending balance (in shares) at Jan. 30, 2016		402,339
Ending balance, value at Jan. 30, 2016	2,471,991	$ 4,023	1,122,329	(229,525)	182	1,574,982
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	1,117,654					1,117,654
Unrealized investment loss, net	(91)				(91)
Common stock issued under stock plans, net of shares used for tax withholding (in shares)		1,192
Common stock issued under stock plans, net of shares used for tax withholding, value	(24,782)	$ 12	18,527	(43,321)
Tax benefit from equity issuance	23,331		23,331
Stock-based compensation	$ 74,554		74,554
Common stock repurchased (in shares)	(11,600)	(11,638)
Common stock repurchased	$ (700,000)	$ (116)	(23,026)			(676,858)
Dividends declared	(214,640)					(214,640)
Ending balance (in shares) at Jan. 28, 2017		391,893
Ending balance, value at Jan. 28, 2017	2,748,017	$ 3,919	1,215,715	(272,846)	91	1,801,138
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	1,362,753					1,362,753
Unrealized investment loss, net	(64)				(64)
Common stock issued under stock plans, net of shares used for tax withholding (in shares)		1,214
Common stock issued under stock plans, net of shares used for tax withholding, value	(26,965)	$ 12	18,456	(45,433)
Stock-based compensation	$ 87,417		87,417
Common stock repurchased (in shares)	(13,500)	(13,489)
Common stock repurchased	$ (875,000)	$ (135)	(31,013)			(843,852)
Dividends declared	(247,526)					(247,526)
Ending balance (in shares) at Feb. 03, 2018		379,618
Ending balance, value at Feb. 03, 2018	3,049,308	$ 3,796	1,292,364	$ (318,279)	$ 27	2,071,400
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of accounting standard | Accounting Standards Update 2016-09	$ 676		$ 1,789			$ (1,113)