Share Based Compensation (RSA/RSU Activity) (Details) (USD $)	9 Months Ended
	Oct. 29, 2011
Restricted stock unit activity
Non-vested at January 29, 2011, Number of Shares	1,147,754
Non-vested at January 29, 2011, Weighted-Average Grant Date Fair Value	$ 49.59
Granted, Number of Shares	558,450
Granted, Weighted-Average Grant Date Fair Value	$ 54.38
Exercised, Number of Shares	(393,728)
Vested, Weighted-Average Grant Date Fair Value	$ 59.59
Forfeited or cancelled, Number of Shares	(94,848)
Forfeited, Weighted-Average Grant Date Fair Value	$ 43.26
Non-vested at October 29, 2011, Number of Shares	1,217,628
Non-vested at October 29, 2011, Weighted-Average Grant Date Fair Value	$ 49.01