Information about Stock Options Outstanding and Exercisable (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	May 02, 2015	Jan. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	5,202	5,569
Options Outstanding, Weighted-Average Remaining Contractual Life	6 years 8 months 5 days
Options Outstanding, Weighted-Average Exercise Price	$ 31.01	$ 25.89
Options Exercisable, Number of Shares	3,685
Options Exercisable, Weighted-Average Exercise Price	$ 23.09
$ 9.85 to $15.10
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	1,130
Options Outstanding, Weighted-Average Remaining Contractual Life	4 years 4 months 2 days
Options Outstanding, Weighted-Average Exercise Price	$ 12.62
Options Exercisable, Number of Shares	1,130
Options Exercisable, Weighted-Average Exercise Price	$ 12.62
$18.80 to $25.19
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	1,201
Options Outstanding, Weighted-Average Remaining Contractual Life	5 years 1 month 2 days
Options Outstanding, Weighted-Average Exercise Price	$ 19.81
Options Exercisable, Number of Shares	1,201
Options Exercisable, Weighted-Average Exercise Price	$ 19.81
$30.92 to $36.59
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	1,510
Options Outstanding, Weighted-Average Remaining Contractual Life	7 years 3 months 22 days
Options Outstanding, Weighted-Average Exercise Price	$ 32.94
Options Exercisable, Number of Shares	1,117
Options Exercisable, Weighted-Average Exercise Price	$ 32.47
$45.08 to $62.11
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	1,361
Options Outstanding, Weighted-Average Remaining Contractual Life	9 years 3 months 29 days
Options Outstanding, Weighted-Average Exercise Price	$ 54.05
Options Exercisable, Number of Shares	237
Options Exercisable, Weighted-Average Exercise Price	$ 45.46