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Warranty Reserves (Details) - Warranty reserve - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 27, 2018
Oct. 28, 2017
Oct. 27, 2018
Oct. 28, 2017
Warranty Reserves        
Beginning balance $ 3,138 $ 1,624 $ 2,090 $ 1,947
Warranty expense (249) 632 361 911
Changes in estimates related to pre-existing warranties (219)   493  
Warranty costs settled (239) (326) (513) (928)
Ending balance $ 2,431 $ 1,930 $ 2,431 $ 1,930