Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Change in derivatives qualifying as hedges, taxes	$ (274)	$ 199	$ (233)	$ 136
Unrealized holding (loss) gain arising during the period, taxes	(33)	233	(98)	331
Reclassification adjustment for (gain) loss included in net income, taxes	7	(79)	40	(82)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition Asset (Obligation), before Tax	$ 9	$ (11)	$ (111)	$ 82