Inventories, Net Level 4 (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Inventory, Raw Materials	$ 55,957	$ 56,525
Inventory, Work in Process	28,499	25,236
Inventory, Finished Goods	105,701	109,422
Inventory, LIFO Reserve	(15,783)	(18,158)
Inventory Valuation Reserves	(13,837)	(15,313)
Inventory, Net	$ 160,537	$ 157,712