Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Jul. 27, 2013	Jul. 28, 2012
Income Taxes [Line Items]
Income taxes	$ 15,526	$ (21,398)
Loss before taxes	(71,496)	(61,226)
Effective income tax rate	(21.70%)	34.90%
Unrecognized tax benefits, all of which, if recognized, would affect effective tax rate	31,460
Accrued interest and penalties included in unrecognized tax benefits	6,593
Unrecognized tax benefits	$ 31,460

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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