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Inventories Inventories (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Mar. 31, 2018
Inventory Disclosure [Abstract]    
Inventory, Raw Materials, Gross $ 21,296 $ 14,674
Inventory, Work in Process, Gross 175,213 167,039
Inventory, Finished Goods, Gross 47,133 54,364
Inventory, Net $ 243,642 $ 236,077