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Inventories (Tables)
6 Months Ended
Oct. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consisted of the following: 
 
October 31,
2015
 
May 2,
2015
Raw materials
$
29,861

 
$
28,325

Work-in-process
8,679

 
7,512

Finished goods
30,901

 
28,552

 
$
69,441

 
$
64,389