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Warranty Reserves (Tables)
 12 Months Ended
Apr. 30, 2013
Warranty Reserves  
Summary of warranty reserve activity

 

 
   April 30,  
 
   2013   2012  
 
   (In thousands)
  

Beginning balance

   $ 2,872   $ 1,127  

Warranty expense

     2,169     4,284  

Warranty costs settled

     (3,526 )   (2,539 )
           

Ending balance

   $ 1,515   $ 2,872