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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Inventory Disclosure [Abstract]      
Work in process $ 85,858   $ 97,138
Finished goods 87,205   108,622
Total inventories $ 173,063 $ 205,369 $ 205,760