Options Granted under Stock Option Plans (Detail) - Aug. 01, 2015 - $ / shares shares in Thousands	Total
Number of Shares
Options outstanding at beginning of year	5,569
Granted	682
Exercised	(1,672)
Expired or cancelled	(51)
Options outstanding at end of year	4,528
Options exercisable at end of year	3,305
Options vested and expected to vest	4,479
Options available for future grant at end of year	13,104
Weighted-Average Term
Options outstanding at end of year	6 years 7 months 6 days
Options exercisable at end of year	5 years 8 months 12 days
Options vested and expected to vest	6 years 7 months 6 days
Weighted-Average Exercise Price
Options outstanding at beginning of year	$ 25.89
Granted	62.11
Exercised	22.49
Expired or cancelled	48.2
Options outstanding at end of year	32.35
Options exercisable at end of year	24.54
Options vested and expected to vest	$ 32.09