Consolidated Statements of Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Net income	$ 48,429,000	$ 29,660,000	$ 9,106,000
Adjustments [Abstract]
Total other comprehensive income (loss)	11,856,000	10,087,000	54,364,000
Comprehensive income	60,285,000	39,747,000	63,470,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(3,735,000)	(5,279,000)	(13,297,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	(2,636,000)	(39,000)	(8,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(2,636,000)	(39,000)	(8,000)
AOCI Attributable to Parent [Member]
Net income	0	0	0
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(4,273,000)	(6,303,000)	12,583,000
Pension liability adjustments, net of taxes of $(3,678), $(5,282) and $(13,261)	8,058,000	16,286,000	41,571,000
Other post retirement obligations adjustments, net of taxes of $16, $48, and $(12)	(66,000)	(153,000)	38,000
Split-dollar life insurance arrangement adjustments, net of taxes of $(73), $(45), and $(24)	251,000	180,000	76,000
Adjustments [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	7,886,000	77,000	96,000
Retained Earnings
Net income	48,429,000	29,660,000	9,106,000
Pension Plans
Adjustments [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(3,678,000)	(5,282,000)	(13,261,000)
Postretirement Benefit Plans
Adjustments [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	16,000	48,000	(12,000)
Defined Benefit Postretirement Life Insurance
Adjustments [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ (73,000)	$ (45,000)	$ (24,000)