Share-Based Compensation (Options Granted Under Stock Option Plans) (Details) shares in Thousands	9 Months Ended
	Oct. 29, 2016 $ / shares shares
Number of Shares
Options outstanding at beginning of year	3,694
Granted	500
Exercised	(1,106)
Expired or cancelled	(52)
Options outstanding at end of period	3,036
Options exercisable at end of period	1,990
Options vested and expected to vest at end of period	3,002
Options available for future grant at end of period	11,968
Weighted-Average Exercise Price
Options outstanding at beginning of year | $ / shares	$ 32.62
Granted | $ / shares	63.60
Exercised | $ / shares	21.44
Expired or cancelled | $ / shares	59.38
Options outstanding at end of period | $ / shares	41.34
Options exercisable at end of period | $ / shares	31.24
Options vested and expected to vest at end of period | $ / shares	$ 41.11
Options Outstanding, Weighted-average Remaining Contractual Life	5 years 10 months 24 days
Options exercisable at end of period, Weighted-average remaining contractual life	4 years 4 months 24 days
Options vested and expected to vest, Weighted-average remaining contractual life	5 years 10 months 24 days