Consolidated Statement of Stockholders Equity - USD ($) $ in Thousands	Total	Directors	Common Stock ($0.01 par value)	Common Stock ($0.01 par value) Equity Option [Member]	Additional Paid-in Capital	Additional Paid-in Capital Directors	Retained Earnings	ESOP Debt Guarantee	Accumulated Other Comprehensive Loss
Opening Balance at Mar. 31, 2014	$ 291,286		$ 198		$ 198,546		$ 133,820	$ (142)	$ (41,136)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,190						27,190
Dividends declared	(3,199)						(3,199)
Change in foreign currency translation adjustment	(29,907)								(29,907)
Change in net unrealized gain on investments, net of tax	(909)								(909)
Change in derivatives qualifying as hedges, net of tax	(334)								(334)
Change in pension liability and postretirement obligations, net of tax	(20,162)								(20,162)
Stock compensation - directors	3,455	$ 440			3,455	$ 440
Stock Issued During Period, Value, Stock Options Exercised	1,607		2		1,605
Tax effect of exercise of stock options	(65)				(65)
Earned ESOP shares	251				109			142
Restricted stock units released, 154,897 shares, net of shares withheld for minimum statutory tax obligation	(934)		0
closing balance at Mar. 31, 2015	268,719		200		203,156		157,811	0	(92,448)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,579						19,579
Dividends declared	(3,217)						(3,217)
Change in foreign currency translation adjustment	3,650								3,650
Change in net unrealized gain on investments, net of tax	(233)								(233)
Change in derivatives qualifying as hedges, net of tax	(1,031)								(1,031)
Change in pension liability and postretirement obligations, net of tax	(4,685)								(4,685)
Stock compensation - directors	3,623	440			3,623	440
Stock Issued During Period, Value, Stock Options Exercised	243		1		242
Tax effect of exercise of stock options	118				118
Earned ESOP shares	(10)				(10)
Restricted stock units released, 154,897 shares, net of shares withheld for minimum statutory tax obligation	(887)		0		(887)		0	0	0
closing balance at Mar. 31, 2016	286,309		201		206,682		174,173	0	(94,747)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,984						8,984
Dividends declared	3,422						3,422
Change in foreign currency translation adjustment	(9,379)								(9,379)
Change in net unrealized gain on investments, net of tax	68								68
Change in derivatives qualifying as hedges, net of tax	(3,514)								(3,514)
Change in pension liability and postretirement obligations, net of tax	10,108								10,108
Stock compensation - directors	5,474	$ 440			5,474	$ 440
Stock Issued During Period, Value, Stock Options Exercised	441		23	$ 2	439
Tax effect of exercise of stock options	(197)				(197)
Proceeds from Issuance of Common Stock					47,283
Earned ESOP shares	47,306							0
Restricted stock units released, 154,897 shares, net of shares withheld for minimum statutory tax obligation	(1,268)		0		(1,268)		0	0	0
closing balance at Mar. 31, 2017	$ 341,350		$ 226		$ 258,853		$ 179,735	$ 0	$ (97,464)