Options Granted under Stock Option Plans (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	May 04, 2013
Shares
Options outstanding at the beginning of the year	5,907
Granted	1,126
Exercised	(346)
Expired or cancelled	(19)
Options outstanding at end of period	6,668
Options exercisable at end of period	4,418
Options available for future grant at end of period	3,621
Weighted-Average Term
Options outstanding at end of period	6 years 10 months 24 days
Options exercisable at end of period	5 years 8 months 27 days
Weighted-Average Exercise Price
Weighted Average Exercise Price at the beginning of the year	$ 19.93
Granted	$ 34.24
Exercised	$ 17.78
Expired or cancelled	$ 24.68
Weighted Average Exercise Price at end of year	$ 22.44
Weighted Average Exercise Price Exercisable at end of year	$ 18.61