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Loss Contingencies (Narratives) (Details)			3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Aug. 02, 2012 USD ($)	Aug. 02, 2012 EUR (€)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2022 EUR (€)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Loss Contingency Accrual								$ 21,227,000	$ 11,944,000
Insurance Recoveries			$ 1,025,000	$ 8,052,000
Loss Contingency Accrual, Product Liability, Gross			22,192,000		$ 22,192,000			21,227,000
Estimation of asbestos-related aggregate liability that is probable and estimable			7,765,000		7,765,000
Estimation of product-related aggregate liability			4,787,000		4,787,000
Loss Contingency Alleged Taxes Owed	$ 7,600,000	€ 6,700,000
Loss Contingency Alleged Taxes Owed Including Penalties And Interest	$ 3,200,000	€ 2,800,000
Accrual for Environmental Loss Contingencies			797,000		797,000
Loss Contingency Accrual, Provision					5,652,000			4,634,000
Loss Contingency Accrual, Payments					(5,712,000)			(3,403,000)
Estimated Insurance Recoveries			9,077,000		9,077,000			(8,052,000)
Loss Contingency Accrual, Product Liability, Net			13,115,000		13,115,000			$ 13,175,000
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
Minimum [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Third Party Recovery					$ 2,000,000
Loss contingency period					37 years
Estimation of asbestos-related aggregate liability that is probable and estimable			5,800,000		$ 5,800,000
Maximum [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Third Party Recovery					6,000,000
Estimation of asbestos-related aggregate liability that is probable and estimable			10,600,000		10,600,000
Litigation Settlement, Amount Awarded from Other Party					1,650,000
Magnetek [Member]
Loss Contingencies [Line Items]
Estimation of asbestos-related aggregate liability that is probable and estimable			497,000		497,000
Fiscal year 2004 [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Third Party Recovery					3,000,000
Fiscal year 2003 [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Third Party Recovery					2,000,000
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual			18,292,000		18,292,000
Accrued Liabilities
Loss Contingencies [Line Items]
Loss Contingency Accrual, Product Liability, Gross			3,900,000		3,900,000
Gain (Loss) Related to Litigation Settlement			1,500,000
Forecast [Member]
Loss Contingencies [Line Items]
Asbestos liability payments					$ 2,400,000
Loss settlement gross period					12 months
Loss Contingency Alleged Taxes Owed						$ 2,200,000	€ 1,900,000
Loss Contingency Alleged Taxes Owed Including Penalties And Interest						$ 3,000,000	€ 2,600,000
DEP [Member] | Magnetek [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies			$ 335,000		$ 335,000
Travelers
Loss Contingencies [Line Items]
Increase (Decrease) in Insurance Settlements Receivable				$ 900,000

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