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Warranty Reserves (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Warranty Reserves    
Beginning balance $ 2,653 $ 1,280
Warranty expense 4,516 2,919
Changes in estimates related to pre-existing warranties (424)  
Warranty costs settled (2,611) (1,546)
Ending balance $ 4,134 $ 2,653