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Inventories, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Notes To Financial Statements [Abstract]        
Inventory, Raw Materials $ 83,009 $ 83,741    
Inventory, Work in Process 30,694 34,904    
Inventory, Finished Goods 131,051 124,005    
Inventory, LIFO Reserve (16,757) (17,280)    
Inventory Valuation Reserves (19,754) (19,639) $ (17,854) $ (18,707)
Inventories, net $ 208,243 $ 205,731