Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Nov. 01, 2014	Oct. 26, 2013	Nov. 01, 2014	Oct. 26, 2013
Income Taxes [Line Items]
Income taxes	$ 760	$ 1,201	$ 2,571	$ 16,727
Income (loss) before taxes	$ 13,058	$ 14,430	$ (13,580)	$ (57,066)
Effective income tax rate	5.80%	8.30%	(18.90%)	(29.30%)
Federal statutory income tax rate			35.00%

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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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