Derivatives and Hedging Derivative Instruments and Hedging Activities Disclosure (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative
Derivative, Term of Contract	4 years 245 days
Derivative, Average Remaining Maturity	3 months
Other Assets [Member]
Derivative
Amount Net for Fair Value of Derivative Assets and (Liabilities)	$ 2,718	$ 8,650
Other Liabilities [Member]
Derivative
Amount Net for Fair Value of Derivative Assets and (Liabilities)	4,522	$ 18,079
Foreign Exchange Forward [Member]
Derivative
Derivative, Notional Amount	163,366
Future [Member]
Derivative
Derivative, Notional Amount	$ 134,190