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Product Warranty (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 01, 2016
Sep. 26, 2015
Oct. 01, 2016
Sep. 26, 2015
Apr. 02, 2016
Product Warranty          
Document Period End Date     Oct. 01, 2016    
Product warranty accrual, beginning $ 5,947 $ 4,021 $ 5,734 $ 3,342  
Warranty charges incurred, net (1,263) (2,063) (3,314) (3,547)  
Provision for warranty charges 837 2,493 3,101 4,656  
Product warranty accrual, ending 5,521 $ 4,451 5,521 $ 4,451  
Product Warranty Accrual, Noncurrent $ 970   $ 970   $ 2,068