Share-Based Compensation (Options Granted Under Stock Option Plans) (Details) shares in Thousands	9 Months Ended
	Oct. 28, 2017 $ / shares shares
Number of Shares
Options outstanding at beginning of year	2,806
Granted	547
Exercised	(536)
Expired or cancelled	(19)
Options outstanding at end of period	2,798
Options exercisable at end of period	1,729
Options available for future grant at end of period	10,759
Weighted-Average Exercise Price
Options outstanding at beginning of year | $ / shares	$ 42.61
Granted | $ / shares	69.58
Exercised | $ / shares	21.38
Expired or cancelled | $ / shares	61.01
Options outstanding at end of period | $ / shares	51.82
Options exercisable at end of period | $ / shares	$ 42.91
Options outstanding, weighted-average remaining contractual life	6 years 8 months 12 days
Options exercisable at end of period, Weighted-average remaining contractual life	5 years 4 months 24 days