Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011	May 01, 2010
Number of Shares
Beginning Balance	3,860	3,876	5,498
Granted	515	1,563
Exercised	(279)	(92)	(1,024)
Forfeited	(720)	(1,487)	(598)
Ending Balance	3,376	3,860	3,876	5,498
Vested and expected to vest in the future at end of period	3,295
Exercisable at end of period	1,304
Available for grant at end of period	2,568
Weighted Average Exercise Price
Beginning Balance	$ 18.76	$ 21.02	$ 20.19
Granted	$ 11.64	$ 15.70
Exercised	$ 12.20	$ 11.89	$ 16.83
Forfeited	$ 20.19	$ 21.86	$ 20.57
Ending Balance	$ 17.91	$ 18.76	$ 21.02	$ 20.19
Vested and expected to vest in the future at end of period	$ 17.96
Exercisable at end of period	$ 22.19
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term	6 years 2 months 27 days	5 years 8 months 12 days	3 years 4 months 24 days	3 years 5 months 27 days
Vested and expected to vest in the future at end of period	6 years 2 months 9 days
Exercisable at end of period	2 years 5 months 1 day
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 7,331	$ 574		$ 13,782
Vested and expected to vest in the future at end of period	7,139
Exercisable at end of period	$ 580

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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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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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