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Inventories Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Apr. 01, 2017
Inventory Disclosure [Abstract]    
Inventory, Raw Materials, Gross $ 16,699 $ 14,517
Inventory, Work in Process, Gross 152,252 161,120
Inventory, Finished Goods, Gross 46,446 51,396
Inventory, Net $ 215,397 $ 227,033