Consolidated Statement of Stockholders Equity - USD ($)	Total	Directors	Common Stock ($0.01 par value)	Common Stock ($0.01 par value) Directors	Additional  Paid-in Capital	Additional  Paid-in Capital Directors	Retained Earnings	Retained Earnings Directors	Accumulated Other  Comprehensive  Loss	Accumulated Other  Comprehensive  Loss Directors	Treasury Stock	Treasury Stock Directors
Opening Balance at Mar. 31, 2020	$ 463,585,000		$ 238,000		$ 287,256,000		$ 290,441,000		$ (114,350,000)		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,106,000		0		0		9,106,000		0		0
Payments of Dividends	5,745,000		0		0		(5,745,000)		0		0
Change in foreign currency translation adjustment	12,583,000		0		0		0		12,583,000		0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(8,000)								96,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	96,000		0		0		0		96,000		0
Change in pension liability and postretirement obligations, net of tax	41,685,000		0		0		0		41,685,000		0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	7,482,000	$ 540,000	0	$ 0	7,482,000	$ 540,000	0	$ 0	0	$ 0	0	$ 0
Stock Issued During Period, Value, Stock Options Exercised	1,973,000		2,000		1,971,000		0		0		0
Restricted stock units released, shares, net of shares withheld for minimum statutory tax obligation	(1,156,000)		0		(1,156,000)		0		0		0
closing balance at Mar. 31, 2021	530,149,000		240,000		296,093,000		293,802,000		(59,986,000)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ (13,297,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	97,398
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	115,281
Payments for Repurchase of Common Stock	$ 0
Net income	29,660,000		0		0		29,660,000		0		0
Payments of Dividends	7,119,000		0		0		(7,119,000)		0		0
Change in foreign currency translation adjustment	(6,302,000)		0		0		0		(6,302,000)		0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(39,000)								77,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	77,000		0		0		0		77,000		0
Change in pension liability and postretirement obligations, net of tax	16,312,000		0		0		0		16,312,000		0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	10,287,000	959,000	0	0	10,287,000	959,000	0	0	0	0	0	0
Stock Issued During Period, Value, Stock Options Exercised	2,655,000		1,000		2,654,000		0		0		0
Restricted stock units released, shares, net of shares withheld for minimum statutory tax obligation	(2,580,000)		1,000		(2,581,000)		0		0		0
closing balance at Mar. 31, 2022	772,803,000		285,000		506,074,000		316,343,000		(49,899,000)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(5,279,000)
Payments of Stock Issuance Costs	8,340
Proceeds from Other Equity	$ 198,705,000		43,000		198,662,000		0		0		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	105,132,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	115,402,000
Comprehensive Income Loss Reclassification	$ 4,930,000
Payments for Repurchase of Common Stock	0
Net income	48,429,000		0		0		48,429,000		0		0
Payments of Dividends	8,014,000										0
Dividends declared			0		0		(8,014,000)		0
Change in foreign currency translation adjustment	(4,273,000)		0		0		0		(4,273,000)		0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(2,636,000)								7,886,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	7,886,000		0		0		0		7,886,000		0
Change in pension liability and postretirement obligations, net of tax	8,243,000		0		0		0		8,243,000		0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	9,231,000	$ 1,194,000	0	$ 0	9,231,000	$ 1,194,000	0	$ 0	0	$ 0	0	$ 0
Stock Issued During Period, Value, Stock Options Exercised	713,000		0		713,000		0		0		0
Restricted stock units released, shares, net of shares withheld for minimum statutory tax obligation	(1,414,000)		1,000		(1,415,000)		0		0		0
closing balance at Mar. 31, 2023	833,797,000		286,000		515,797,000		356,758,000		(38,043,000)		(1,001,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ (3,735,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	32,158
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	93,315
Comprehensive Income Loss Reclassification	$ 4,011,000
Payments for Repurchase of Common Stock	$ (1,001,000)		$ 0		$ 0		$ 0		$ 0		$ (1,001,000)
Treasury Stock, Shares	31,085