Consolidated Statement of Stockholders Equity - USD ($) $ in Thousands	Total	Directors	Common Stock ($0.01 par value)	Additional Paid-in Capital	Additional Paid-in Capital Directors	Retained Earnings	Accumulated Other Comprehensive Loss
Opening Balance at Mar. 31, 2016	$ 286,309		$ 201	$ 206,682		$ 174,173	$ (94,747)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,984		0	0		8,984	0
Payments of Dividends	(3,422)		0	0		3,422	0
Change in foreign currency translation adjustment	(9,379)		0	0		0	(9,379)
Change in net unrealized gain on investments, net of tax	68		0	0		0	68
Change in derivatives qualifying as hedges, net of tax	(3,514)		0	0		0	(3,514)
Change in pension liability and postretirement obligations, net of tax	10,108		0	0		0	10,108
Stock compensation - directors	5,474	$ 440	0	5,474	$ 440	0	0
Stock Issued During Period, Value, Stock Options Exercised	441		2	439		0	0
Tax effect of exercise of stock options	(197)			197			0
Earned ESOP shares			23	47,283		0	0
Stock Repurchased and Retired During Period, Value	47,306
Restricted stock units released, shares, net of shares withheld for minimum statutory tax obligation	(1,268)		0	(1,268)		0	0
closing balance at Mar. 31, 2017	341,350		226	258,853		179,735	(97,464)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,065		0	0		22,065	0
Payments of Dividends	(3,903)		0	0		3,903	0
Change in foreign currency translation adjustment	21,717		0	0		0	21,717
Change in net unrealized gain on investments, net of tax	189		0	0		0	189
Change in derivatives qualifying as hedges, net of tax	3,563		0	0		0	3,563
Change in pension liability and postretirement obligations, net of tax	12,737		0	0		0	12,737
Stock compensation - directors	5,156	430	0	5,156	430	0	0
Stock Issued During Period, Value, Stock Options Exercised	6,332		4	6,328		0	0
Tax effect of exercise of stock options	(1,407)			1,407			0
closing balance at Mar. 31, 2018	408,229		230	269,360		197,897	(59,258)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42,577		0	0		42,577	0
Payments of Dividends	(4,903)
Dividends declared			0	0		(4,903)	0
Change in foreign currency translation adjustment	(16,708)		0	0		0	(16,708)
Change in net unrealized gain on investments, net of tax	(883)		0	0		0	(883)
Change in derivatives qualifying as hedges, net of tax	(1,037)		0	0		0	(1,037)
Change in pension liability and postretirement obligations, net of tax	(5,166)		0	0		0	(5,166)
Stock compensation - directors	5,768	$ 430	0	5,768	$ 430	0
Stock Issued During Period, Value, Stock Options Exercised	4,152		4	4,148		0
Tax effect of exercise of stock options
Restricted stock units released, shares, net of shares withheld for minimum statutory tax obligation	(2,188)		0	(2,188)		0
closing balance at Mar. 31, 2019	431,159		234	277,518		236,459	(83,052)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	888
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member]	$ 888		$ 0	$ 0		$ 888	$ 0