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Warranty Reserves (Tables)
 12 Months Ended
Apr. 30, 2014
Warranty Reserves  
Summary of warranty reserve activity

  April 30,  
 
   2014   2013  
 
   (In thousands)
  

Beginning balance

   $ 1,515   $ 2,872  

Warranty expense

     1,436     2,169  

Warranty costs settled

     (1,671 )   (3,526 )
           
​ ​ ​ ​ ​ ​ ​ ​

Ending balance

   $ 1,280   $ 1,515  
           
​ ​ ​ ​ ​ ​ ​ ​
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