Loss Contingencies (Narratives) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Loss Contingencies [Line Items]
Loss Contingency Accrual, Product Liability, Gross	$ 22,575,000	$ 21,227,000	$ 11,944,000
Loss Contingency Alleged Taxes Owed	7,400,000
Loss Contingency Alleged Taxes Owed Including Penalties And Interest	3,100,000
Accrual for Environmental Loss Contingencies	822,000
Estimated Insurance Recoveries	9,160,000	8,052,000	0
Loss Contingency Accrual, Product Liability, Net	13,415,000	13,175,000	11,944,000
Loss Contingency Accrual, Period Increase (Decrease)	1,830,000
Gain (Loss) Related to Litigation Settlement	$ 3,006,000
Financial Guarantee Insurance Contracts, Risk Management Activities, Mitigating Claim Liabilities, Policy	75,000,000
Aggregate amount of reserves	$ 22,575,000	21,227,000	$ 11,944,000	$ 12,686,000
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	37 years
Asbestos related aggregate liability	$ 7,836,000,000
Estimated asbestos related liability payments over the next 12 months	2,400,000
Product related aggregate liability	4,951,000,000
Minimum
Loss Contingencies [Line Items]
Asbestos-related aggregate liability - Maximum	5,800,000
Maximum
Loss Contingencies [Line Items]
Asbestos-related aggregate liability - Maximum	10,600,000
Litigation Settlement, Amount Awarded from Other Party	1,650,000
Travelers
Loss Contingencies [Line Items]
Increase (Decrease) in Insurance Settlements Receivable	900,000
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Product Liability, Gross	18,675,000	17,727,000
Accrued Liabilities
Loss Contingencies [Line Items]
Loss Contingency Accrual, Product Liability, Gross	3,900,000	$ 3,500,000
Estimated Insurance Recoveries	1,109,000
Gain (Loss) Related to Litigation Settlement	1,500,000
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	562,000
Magnetek [Member] | Maximum
Loss Contingencies [Line Items]
Asbestos-related aggregate liability - Maximum	565,000
Magnetek [Member] | Bridgeport Facility [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	$ 323,000