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Accrued Expenses - Narrative (Detail) - USD ($)
$ in Thousands
Apr. 28, 2019
Apr. 30, 2018
Apr. 29, 2018
Payables and Accruals [Abstract]      
Accrued expenses $ 9,525   $ 10,088
Current accrued expenses 9,192 $ 10,497 9,325
Long-term accrued expenses $ 333   $ 763