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Computation of Basic and Diluted per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended																12 Months Ended
	Feb. 01, 2020	[1]	Nov. 02, 2019	[1]	Aug. 03, 2019	[1]	May 04, 2019	[1]	Feb. 02, 2019	[1]	Nov. 03, 2018	[1]	Aug. 04, 2018	[1]	May 05, 2018	[1]	Feb. 01, 2020	Feb. 02, 2019	Feb. 03, 2018
Basic net income per share
Net income																	$ 465,116	$ 414,745	$ 384,852
Weighted average number of common shares – basic																	65,943	66,812	68,286
Net income per common share – basic	$ 3.14		$ 1.46		$ 1.28		$ 1.18		$ 2.77		$ 1.15		$ 1.06		$ 1.23		$ 7.05	$ 6.21	$ 5.64
Diluted net income per share
Net income																	$ 465,116	$ 414,745	$ 384,852
Weighted average number of common shares – basic																	65,943	66,812	68,286
Assumed exercise of stock options and vesting of restricted stock																	1,350	1,867	2,002
Weighted average number of common shares – diluted																	67,293	68,679	70,288
Net income per common share – diluted	$ 3.08		$ 1.44		$ 1.26		$ 1.15		$ 2.70		$ 1.12		$ 1.03		$ 1.20		$ 6.91	$ 6.04	$ 5.48
[1] Quarterly net income per share results may not equal full year amounts due to rounding.

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