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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 28, 2017
Jan. 30, 2016
Jan. 28, 2017
Jan. 30, 2016
Warranty Reserves        
Beginning balance     $ 4,134 $ 2,653
Warranty expense $ 245 $ 1,032 581 2,740
Changes in estimates related to pre-existing warranties 200   1,428 (424)
Warranty costs settled (679) (508) (2,689) (2,107)
Ending balance $ 3,454 $ 2,862 $ 3,454 $ 2,862