Consolidated Statement of Stockholders Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Common Stock ($.01 par value)	$ 0.01	$ 0.01	$ 0.01
Change in net unrealized gain on investments, tax	$ 0	$ 0	$ (124)
Change in pension liability and postretirement obligations, tax	$ 8,010	$ 2,097	$ (5,205)
Stock options exercised, shares	296,027	187,907	363,091
Change in derivatives qualifying as hedges, tax	$ (565)	$ 469	$ (1,519)
Restricted stock units released, net of shares withheld for minimum statutory tax obligation	82,861	157,715	116,775