Stock Option Plan Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
Jul. 28, 2012
Options Outstanding
Beginning Balance	55,591
Granted	6,855
Exercised	(3,117)
Canceled/Forfeited	(1,023)
Ending Balance	58,306
Weighted Average Exercise Price
Beginning Balance	$ 12.70
Granted	$ 14.75
Exercised	$ 7.23
Canceled/Forfeited	$ 16.16
Ending Balance	$ 13.17
Time Based Option Award
Options Outstanding
Beginning Balance	52,467
Granted	6,855
Exercised	(3,117)
Canceled/Forfeited	(963)
Ending Balance	55,242
Vested or expected to vest at July 28, 2012	53,650
Exercisable at July 28, 2012	41,521
Weighted Average Exercise Price
Beginning Balance	$ 12.53
Granted	$ 14.75
Exercised	$ 7.23
Canceled/Forfeited	$ 16.20
Ending Balance	$ 13.04
Vested or expected to vest at July 28, 2012	$ 13.00
Exercisable at July 28, 2012	$ 12.89
Market Based Option Award
Options Outstanding
Beginning Balance	3,124
Canceled/Forfeited	(60)
Ending Balance	3,064
Weighted Average Exercise Price
Beginning Balance	$ 15.43
Canceled/Forfeited	$ 15.43
Ending Balance	$ 15.43

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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 number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the 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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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