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Accrued Expenses - Narrative (Detail) - USD ($)
$ in Thousands
Jul. 29, 2018
Apr. 30, 2018
Apr. 29, 2018
Jul. 30, 2017
Payables and Accruals [Abstract]        
Accrued expenses $ 8,925   $ 10,088 $ 6,075
Current accrued expenses 8,176 $ 10,497 9,325 [1] $ 6,075
Long-term accrued expenses $ 749   $ 763 [1]  
[1] Derived from audited financial statements.