Summary of Stock Options Outstanding under All Plans (Detail) (USD $)	9 Months Ended
Oct. 27, 2012
Options Outstanding
Options outstanding, beginning of period	5,890,439
Granted	1,708,354
Exercised	(177,463)
Forfeited or expired	(535,614)
Options outstanding, end of period	6,885,716
Options exercisable, end of period	3,253,320
Weighted-Average Exercise Price
Weighted-Average Exercise Price, beginning of period	$ 9.29
Granted	$ 9.68
Exercised	$ 5.62
Forfeited or expired	$ 13.00
Weighted-Average Exercise Price, end of period	$ 9.19
Weighted-Average Exercise Price, Exercisable, end of period	$ 10.62
Weighted-Average Remaining Contractual Term
Weighted-Average Remaining Contractual Term, Outstanding at end of period	7 years 18 days
Weighted-Average Remaining Contractual Term, Exercisable at end of period	5 years 3 months 22 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding end of period	$ 8,685,000
Aggregate Intrinsic Value, Exercisable end of period	$ 4,245,000

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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