Consolidated Statement of Stockholders Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Common Stock ($.01 par value)	$ 0.01	$ 0.01	$ 0.01
Change in net unrealized gain on investments, tax	$ (124)	$ (37)	$ 126
Change in pension liability and postretirement obligations, tax	$ (5,205)	$ (6,442)	$ 4,197
Stock options exercised, shares	363,091	27,848	16,033
Earned ESOP shares	0	0	0
Change in derivatives qualifying as hedges, tax	$ (1,519)	$ 900	$ 430
Restricted stock units released, net of shares withheld for minimum statutory tax obligation	116,775	154,897	75,370