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Property and Equipment, net (Tables)
 12 Months Ended
Apr. 30, 2014
Property and Equipment, net  
Schedule of property and equipment
  April 30,  
 
   2014   2013  
 
   (In thousands)
  

Leasehold improvements

   $ 8,611   $ 8,498  

Machinery and equipment

     42,025     37,873  

Furniture and fixtures

     1,840     1,866  

Computer equipment and software

     24,377     23,432  

Construction in process

     6,344     7,142  
           
​ ​ ​ ​ ​ ​ ​ ​

Property and equipment, gross

     83,197     78,811  

Less accumulated depreciation and amortization

     (63,200 )   (54,382 )
           
​ ​ ​ ​ ​ ​ ​ ​

Property and equipment, net

   $ 19,997   $ 24,429  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​