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Inventories, net (Tables)
 12 Months Ended
Apr. 30, 2014
Inventories, net  
Schedule of inventories
  April 30,  
 
   2014   2013  
 
   (In thousands)
  

Raw materials

   $ 15,102   $ 12,845  

Work in process

     7,542     16,745  

Finished goods

     31,289     36,842  
           
​ ​ ​ ​ ​ ​ ​ ​

Inventories, gross

     53,933     66,432  

Reserve for inventory obsolescence

     (3,234 )   (3,871 )
           
​ ​ ​ ​ ​ ​ ​ ​

Inventories, net

   $ 50,699   $ 62,561  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​