Quarterly Result (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended																12 Months Ended
		Feb. 02, 2019		Nov. 03, 2018		Aug. 04, 2018		May 05, 2018		Feb. 03, 2018		Oct. 28, 2017		Jul. 29, 2017		Apr. 29, 2017		Feb. 02, 2019	Feb. 03, 2018	Jan. 28, 2017
Quarterly Financial Information Disclosure [Abstract]
Net sales		$ 1,991,483	[1]	$ 1,634,489	[1]	$ 1,498,633	[1]	$ 1,518,446	[1]	$ 1,936,829	[1]	$ 1,438,167	[1]	$ 1,363,224	[1]	$ 1,346,546	[1]	$ 6,643,051	$ 6,084,766	$ 5,566,038
Type of Revenue [Extensible List]		us-gaap:ProductMember	[1]	us-gaap:ProductMember	[1]	us-gaap:ProductMember	[1]	us-gaap:ProductMember	[1]	us-gaap:ProductMember	[1]	us-gaap:ProductMember	[1]	us-gaap:ProductMember	[1]	us-gaap:ProductMember	[1]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross margin	[1],[2]	$ 835,529	[3]	$ 692,480	[3]	$ 621,159	[3]	$ 625,764	[3]	$ 813,921		$ 606,439		$ 555,098		$ 550,150
Net income		$ 184,351	[1]	$ 76,849	[1]	$ 70,957	[1]	$ 82,588	[1]	$ 240,703	[1]	$ 44,879	[1]	$ 46,902	[1]	$ 52,368	[1]	$ 414,745	$ 384,852	$ 215,873
Net income per share—basic
Common stockholders		$ 2.77	[1],[4]	$ 1.15	[1],[4]	$ 1.06	[1],[4]	$ 1.23	[1],[4]	$ 3.58	[1],[4]	$ 0.66	[1],[4]	$ 0.68	[1],[4]	$ 0.76	[1],[4]	$ 6.21	$ 5.64	$ 3.06
Net income per share—diluted
Common stockholders		$ 2.70	[1],[4]	$ 1.12	[1],[4]	$ 1.03	[1],[4]	$ 1.20	[1],[4]	$ 3.47	[1],[4]	$ 0.65	[1],[4]	$ 0.66	[1],[4]	$ 0.73	[1],[4]	$ 6.04	$ 5.48	$ 3.01

[1] The fiscal quarter ended February 3, 2018 consisted of 14 weeks. All other fiscal quarters presented consisted of 13 weeks.

[2] During the quarterly periods ended February 2, 2019 and February 3, 2018, the Company recorded shortage adjustments of $1.9 million and $1.7 million, respectively, as a result of actual shortage being less than what the Company had estimated throughout the year.

[3] Gross margin is equal to net sales less cost of sales.

[4] Quarterly net income per share results may not equal full year amounts due to rounding.