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Inventories
9 Months Ended
Jan. 31, 2014
Inventory Disclosure [Abstract]  
Inventories

Components of inventories are as follows:

 

   January 31,
2014
  April 30,
2013
       
Raw materials  $101,906   $114,081 
Work-in-process   21,957    18,638 
Finished goods   11,574    6,705 
   $135,437   $139,424