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Inventories (Tables)
9 Months Ended
Jan. 27, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consisted of the following: 
 
January 27,
2018
 
April 29,
2017
Raw materials
$
26,833

 
$
24,801

Work-in-process
11,813

 
7,366

Finished goods
31,805

 
34,319

 
$
70,451

 
$
66,486