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Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 29, 2017	Apr. 30, 2016	May 02, 2015
Current:
Federal	$ 5,268	$ (467)	$ 6,657
State	1,158	123	1,150
Foreign	863	557	848
Deferred:
Federal	(1,625)	463	1,906
State	(397)	(89)	307
Foreign	(21)	478	(67)
Income tax expense	$ 5,246	$ 1,065	$ 10,801

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