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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Warranty Reserves    
Beginning balance $ 3,231 $ 4,134
Warranty expense 447 192
Changes in estimates related to pre-existing warranties   1,407
Warranty costs settled (793) (510)
Ending balance $ 2,885 $ 5,223