Share Based Compensation (RSA/RSU Activity) (Details) (USD $)	3 Months Ended
Apr. 28, 2012
Restricted stock unit activity
Non-vested at start date, Number of Shares	1,189,292
Non-vested at start date, Weighted-Average Grant Date Fair Value	$ 49.11
Granted, Number of Shares	502,025
Granted, Weighted-Average Grant Date Fair Value	$ 50.62
Exercised, Number of Shares	(304,256)
Forfeited or cancelled, Number of Shares	(108,106)
Forfeited, Weighted-Average Grant Date Fair Value	$ 59.77
Non-vested at end date, Number of Shares	1,278,955
Non-vested at end date, Weighted-Average Grant Date Fair Value	$ 48.06

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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