Derivatives Schedule of Fair Value and Cash Flow Hedges Including in Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 1,100
Other Nonoperating Income (Expense)	(11,214)	$ (24,592)	$ 3,871
Cost of Goods Sold	(924,276)	(860,744)	(571,944)
Other Operating Income (Expense) [Member]
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(6,034)	0	0
Gain (Loss) on Fair Value Hedges Recognized in Earnings	1,900	0	0
Cost of sales
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ (698)	$ 2,420	$ (5,170)