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Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Current:      
Federal $ (2,142) $ 1,646 $ 5,268
State 384 868 1,158
Foreign 1,151 1,205 863
Deferred:      
Federal (2,725) 3,693 (1,625)
State (390) 27 (397)
Foreign (264) (572) (21)
Income tax (benefit) expense $ (3,986) $ 6,867 $ 5,246