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Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Current:      
Federal $ 1,646 $ 5,268 $ (467)
State 868 1,158 123
Foreign 1,205 863 557
Deferred:      
Federal 3,693 (1,625) 463
State 27 (397) (89)
Foreign (572) (21) 478
Income tax expense 6,867 $ 5,246 $ 1,065
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense 3,534    
Tax Cuts And Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense $ 285