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Product Warranty (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Product Warranty        
Standard and Extended Product Warranty Accrual $ 11,525 $ 6,538 $ 10,220 $ 5,474
Warranty charges incurred, net (742) (2,666) (4,343) (5,111)
Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties (1,560)      
Provision for warranty charges   3,284 3,346 6,793
Standard and Extended Product Warranty Accrual 9,223 7,156 9,223 7,156
Product Warranty Accrual, Noncurrent $ 3,556 $ 2,300 $ 3,556 $ 2,300
Document Period End Date     Sep. 29, 2018