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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 28, 2017
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Warranty Reserves        
Beginning balance $ 2,885 $ 5,223 $ 3,231 $ 4,134
Warranty expense 719 144 1,166 336
Changes in estimates related to pre-existing warranties   (179)   1,228
Warranty costs settled (520) (1,500) (1,313) (2,010)
Ending balance $ 3,084 $ 3,688 $ 3,084 $ 3,688