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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 27, 2019
Jul. 28, 2018
Warranty Reserves    
Beginning balance $ 1,704 $ 2,090
Warranty expense 549 611
Changes in estimates related to pre-existing warranties   712
Warranty costs settled (540) (275)
Ending balance $ 1,713 $ 3,138