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Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
May. 02, 2015
Apr. 26, 2014
Apr. 27, 2013
Current:      
Federal $ 6,657 $ 11,342 $ 9,517
State 1,150 1,454 2,219
Foreign 848 696 754
Deferred:      
Federal 1,906 1,241 (3,114)
State 307 667 (1,090)
Foreign (67) (365) (136)
Income tax expense $ 10,801 $ 15,035 $ 8,150