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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 27, 2018
Jan. 28, 2017
Jan. 27, 2018
Jan. 28, 2017
Warranty Reserves        
Beginning balance $ 3,084 $ 3,688 $ 3,231 $ 4,134
Warranty expense 1,347 245 2,513 581
Changes in estimates related to pre-existing warranties   200   1,428
Warranty costs settled (566) (679) (1,879) (2,689)
Ending balance $ 3,865 $ 3,454 $ 3,865 $ 3,454