Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Change in derivatives qualifying as hedges, taxes	$ (432)	$ (18)	$ (296)	$ (133)
Unrealized holding (loss) gain arising during the period, taxes	(78)	(55)	253	(208)
Reclassification adjustment for (gain) loss included in net income, taxes	(1)	298	(83)	413
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition Asset (Obligation), before Tax	$ (83)	$ (74)	$ 0	$ (216)