Supplemental Balance Sheets and Statements of Operations Detail Supplemental Balance Sheets and Statements of Operations - Inventory and Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Inventory [Line Items]
Inventory, Raw Materials and Supplies, Gross	$ 80,289	$ 83,372
Inventory, Work in Process, Gross	46,631	52,759
Inventory, Finished Goods, Gross	58,060	53,211
Inventory, Gross	184,980	189,342
Inventory Valuation Reserves	16,101	17,499
Inventory, Net	168,879	171,843
Inventory Valuation Reserve [Member]
Inventory [Line Items]
Balance at the beginning of the period	17,499	26,826	$ 18,464
Charged to Cost and Expense	5,696	9,291	11,846
Deductions	7,326	17,520	3,880
Other	232	(1,098)	396
Balance at the end of the period	$ 16,101	$ 17,499	$ 26,826