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Selected Financial Statement Data - Accrued Expenses (Details) - USD ($)
$ in Thousands
Apr. 27, 2019
Apr. 28, 2018
Selected Financial Statement Data [Abstract]    
Compensation $ 12,766 $ 12,841
Taxes, other than income taxes 2,685 2,907
Accrued employee benefits 3,046 2,829
Short-term accrued expenses 8,520 6,437
Claims liabilities 2,685 2,711
Acquisition-related contingency consideration 2,359 808
Accrued expenses $ 32,061 $ 28,533