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Warranty Reserve (Tables)
6 Months Ended
Oct. 31, 2012
Warranty Reserve [Abstract]  
Change in accrued warranty
                 
    October 31, 2012     October 31, 2011  

Beginning Balance

  $ 6,412     $ 4,213  

Warranties issued and adjustments to provisions

    1,599       3,879  

Warranty claims

    (1,898     (1,555
   

 

 

   

 

 

 

Ending Balance

  $ 6,113     $ 6,537