Loss Contingencies (Narratives) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Loss Contingencies [Line Items]
Loss Contingency Accrual, Product Liability, Gross	$ 21,103,000	$ 22,575,000	$ 21,227,000
Loss Contingency Alleged Taxes Owed	7,300,000
Loss Contingency Alleged Taxes Owed Including Penalties And Interest	3,000,000
Accrual for Environmental Loss Contingencies	707,000
Estimated Insurance Recoveries	8,272,000	(9,160,000)	(8,052,000)
Loss Contingency Accrual, Product Liability, Net	$ 12,831,000	13,415,000	13,175,000
Financial Guarantee Insurance Contracts, Risk Management Activities, Mitigating Claim Liabilities, Policy	75,000,000
Gross Defense Costs Prior to Retro Premiums Required by Settlement, Percentage	65.00%
Indemnity Costs Covered by Insurance, Percentage	100.00%
Aggregate amount of reserves	$ 21,103,000	22,575,000	$ 21,227,000	$ 11,944,000
Per occurrence limits on self-insurance for general and product liability coverage	2,000,000
Per occurrence limits on self-insurance for general and product liability coverage for 2014 and thereafter	3,000,000
Coverage minimum	2,000,000
Coverage maximum	$ 6,000,000
Claims maximum period	38 years
Asbestos related aggregate liability	$ 7,051,000,000
Estimated asbestos related liability payments over the next 12 months	2,900,000
Product related aggregate liability	5,117,000,000
Minimum
Loss Contingencies [Line Items]
Asbestos-related aggregate liability - Maximum	5,300,000
Maximum
Loss Contingencies [Line Items]
Asbestos-related aggregate liability - Maximum	9,700,000
Litigation Settlement, Amount Awarded from Other Party	1,650,000
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Product Liability, Gross	16,203,000	18,675,000
Accrued Liabilities
Loss Contingencies [Line Items]
Loss Contingency Accrual, Product Liability, Gross	4,900,000	3,900,000
Estimated Insurance Recoveries	(889,000)	$ (1,109,000)
Tax Year 2003/2004 [Member] | Minimum
Loss Contingencies [Line Items]
Loss Contingency Alleged Taxes Owed	2,100,000
Tax Year 2003/2004 [Member] | Maximum
Loss Contingencies [Line Items]
Loss Contingency Alleged Taxes Owed	2,400,000
Magnetek [Member] | Minimum
Loss Contingencies [Line Items]
Asbestos-related aggregate liability - Maximum	663,000
Magnetek [Member] | Maximum
Loss Contingencies [Line Items]
Asbestos-related aggregate liability - Maximum	562,000
Magnetek [Member] | Bridgeport Facility [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	$ 218,000