Consolidated Statement of Stockholders Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]
Common Stock ($.01 par value)	$ 0.01	$ 0.01	$ 0.01
Change in net unrealized gain on investments, tax	$ (37)	$ 126	$ 489
Change in pension liability and postretirement obligations, tax	$ (6,442)	$ 4,197	$ 12,684
Stock options exercised, shares	27,848	16,033	87,210
Earned ESOP shares	0	0	8,369
Change in derivatives qualifying as hedges, tax	$ 900	$ 430	$ 233
Restricted stock units released, net of shares withheld for minimum statutory tax obligation	154,897	75,370	78,734