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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 30, 2021
Jan. 25, 2020
Jan. 30, 2021
Jan. 25, 2020
Warranty Reserves        
Beginning balance $ 2,126 $ 1,875 $ 2,015 $ 1,704
Warranty expense 277 250 1,038 1,469
Changes in estimates related to pre-existing warranties       (189)
Warranty costs settled (231) (289) (881) (1,148)
Ending balance $ 2,172 $ 1,836 $ 2,172 $ 1,836