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Inventories (Tables)
9 Months Ended
Jan. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consisted of the following: 
 
January 31,
2015
 
April 26,
2014
Raw materials
$
28,717

 
$
27,660

Work-in-process
10,073

 
11,835

Finished goods
28,870

 
22,733

 
$
67,660

 
$
62,228