Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2018
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ (3,735,000)	$ (5,279,000)	$ (13,297,000)
Pension Plans
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(3,678,000)	(5,282,000)	(13,261,000)	$ 7,605,000
Postretirement Benefit Plans
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	16,000	48,000	(12,000)	935,000
Defined Benefit Postretirement Life Insurance
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ (73,000)	$ (45,000)	$ (24,000)	$ 747,000