XML 81 R68.htm IDEA: XBRL DOCUMENT v3.10.0.1
Accrued Expenses - Narrative (Detail) - USD ($)
$ in Thousands
Jan. 27, 2019
Apr. 30, 2018
Apr. 29, 2018
Jan. 28, 2018
Payables and Accruals [Abstract]        
Accrued expenses $ 9,740   $ 10,088 $ 8,842
Current accrued expenses 9,740 $ 10,497 9,325 [1] $ 8,842
Long-term accrued expenses $ 0   $ 763 [1]  
[1] Derived from audited financial statements.