Quarterly report pursuant to Section 13 or 15(d)

Basis of Financial Statement Presentation - Inventory (Details)

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Basis of Financial Statement Presentation - Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials and supplies $ 89,198 $ 88,408
Work in process 66,456 65,417
Finished goods 73,865 66,907
Subtotal 229,519 220,732
Inventory reserves (16,251) (16,346)
Inventories, net $ 213,268 $ 204,386