Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $)	3 Months Ended
Apr. 28, 2012
Stock-Based Compensation [Abstract]
Outstanding, beginning of period, Number of Shares	6,303,378
Granted, Number of Shares
Exercised, Number of Shares	(764,493)
Canceled or expired, Number of Shares	(76,921)
Outstanding, end of period, Number of Shares	5,461,964
Exercisable at April 28, 2012, Number of Shares	3,915,276
Outstanding, beginning of period, Weighted Average Exercise Price	$ 13.09
Granted, Weighted Average Exercise Price
Exercised, Weighted Average Exercise Price	$ 6.43
Canceled or expired, Weighted Average Exercise Price	$ 14.65
Outstanding, end of period, Weighted Average Exercise Price	$ 14.00
Exercisable at April 28, 2012, Weighted Average Exercise Price	$ 14.34

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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The decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed during the reporting period.

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Net number of share options (or share units) granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of share options (or share units) exercised during the current period.

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