Consolidated Statement of Stockholders Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Statement of Stockholders' Equity [Abstract]
Common Stock ($.01 par value)	$ 0.01	$ 0.01	$ 0.01
Change in net unrealized gain on investments, tax	$ 489	$ 695	$ (138)
Change in pension liability and postretirement obligations, tax	12,684	8,178	(237)
Stock options exercised, shares	87,210	229,516	39,878
Earned ESOP shares	8,369	25,611	26,480
Change in derivatives qualifying as hedges, tax	$ 233	$ (119)	$ 159
Restricted stock units released, net of shares withheld for minimum statutory tax obligation	78,734	56,203,000