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Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	May 02, 2015	Apr. 26, 2014
Current:
Federal	$ (467)	$ 6,657	$ 11,342
State	123	1,150	1,454
Foreign	557	848	696
Deferred:
Federal	463	1,906	1,241
State	(89)	307	667
Foreign	478	(67)	(365)
Income tax expense	$ 1,065	$ 10,801	$ 15,035

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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