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Warranty Reserves (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Warranty Reserves    
Beginning balance $ 2,015 $ 1,704
Warranty expense 1,650 2,258
Changes in estimates related to pre-existing warranties   (189)
Warranty costs settled (1,324) (1,758)
Ending balance $ 2,341 $ 2,015