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Accrued Expenses - Narrative (Detail) - USD ($)
$ in Thousands
Oct. 28, 2018
Apr. 30, 2018
Apr. 29, 2018
Oct. 29, 2017
Payables and Accruals [Abstract]        
Accrued expenses $ 8,670   $ 10,088 $ 7,364
Current accrued expenses $ 8,670 $ 10,497 9,325 [1] $ 7,364
Long-term accrued expenses [1]     $ 763  
[1] Derived from audited financial statements.