Information about Stock Options Outstanding and Exercisable (Detail) - $ / shares shares in Thousands	6 Months Ended
	Aug. 01, 2015	Jan. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	4,528	5,569
Options Outstanding, Weighted-Average Remaining Contractual Life	6 years 7 months 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 32.35	$ 25.89
Options Exercisable, Number of Shares	3,305
Options Exercisable, Weighted-Average Exercise Price	$ 24.54
$ 9.85 to $18.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	872
Options Outstanding, Weighted-Average Remaining Contractual Life	4 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 13.28
Options Exercisable, Number of Shares	872
Options Exercisable, Weighted-Average Exercise Price	$ 13.28
$18.84 to $24.75
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	1,054
Options Outstanding, Weighted-Average Remaining Contractual Life	5 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 19.68
Options Exercisable, Number of Shares	1,054
Options Exercisable, Weighted-Average Exercise Price	$ 19.68
$30.92 to $36.59
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	1,249
Options Outstanding, Weighted-Average Remaining Contractual Life	7 years
Options Outstanding, Weighted-Average Exercise Price	$ 32.79
Options Exercisable, Number of Shares	1,075
Options Exercisable, Weighted-Average Exercise Price	$ 32.56
$45.08 to $62.11
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	1,353
Options Outstanding, Weighted-Average Remaining Contractual Life	9 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 54.1
Options Exercisable, Number of Shares	304
Options Exercisable, Weighted-Average Exercise Price	$ 45.38