Summary of Additional Information about Restricted Stock units (Detail) - Restricted Stock Units (RSUs) - USD ($)		12 Months Ended
		Jan. 31, 2016	Feb. 01, 2015	Feb. 02, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value per share of awards granted		$ 76.19	$ 63.18	$ 53.59
Intrinsic value of awards released	[1]	$ 50,773,000	$ 101,189,000	$ 24,568,000

[1] Intrinsic value for releases is based on the market value on the date of release.