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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 29, 2016
Oct. 31, 2015
Oct. 29, 2016
Oct. 31, 2015
Warranty Reserves        
Beginning balance $ 5,223   $ 4,134 $ 2,653
Warranty expense 144 $ 1,001 336 1,708
Changes in estimates related to pre-existing warranties (179)   1,228 (424)
Warranty costs settled (1,500) (692) (2,010) (1,599)
Ending balance $ 3,688 $ 2,338 $ 3,688 $ 2,338