Share Based Compensation (RSA - RSU Activity) (Details) (USD $)	6 Months Ended
	Jul. 28, 2012
Restricted stock unit activity
Non-vested, Number of Shares Beginning Balance	1,189,292
Non-vested at Beginning Balance, Weighted-Average Grant Date Fair Value	$ 49.11
Granted, Number of Shares	559,915
Granted, Weighted-Average Grant Date Fair Value	$ 49.17
Exercised, Number of Shares	(341,672)
Vested, Weighted-Average Grant Date Fair Value	$ 52.83
Forfeited or cancelled, Number of Shares	(164,642)
Forfeited, Weighted-Average Grant Date Fair Value	$ 55.61
Non-vested, Number of Shares Ending Balance	1,242,893
Non-vested Ending Balance, Weighted-Average Grant Date Fair Value	$ 47.26