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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 |  |  |

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