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Loss Contingencies (Narratives) (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual, Product Liability, Gross | $ 21,227,000 | $ 11,944,000 | $ 12,686,000 |
Loss Contingency Alleged Taxes Owed | 7,900,000 |  |  |
Loss Contingency Alleged Taxes Owed Including Penalties And Interest | 3,300,000 |  |  |
Accrual for Environmental Loss Contingencies | 777,000 |  |  |
Estimated Insurance Recoveries | 8,052,000 | 0 | 0 |
Loss Contingency Accrual, Product Liability, Net | 13,175,000 | 11,944,000 | 12,686,000 |
Loss Contingency Accrual, Period Increase (Decrease) | 1,830,000 |  |  |
Gain (Loss) Related to Litigation Settlement | 3,006,000 |  |  |
Proceeds from Legal Settlements | 2,842,000 |  |  |
Aggregate amount of reserves | 21,227,000 | 11,944,000 | $ 12,686,000 | $ 13,582,000
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 | $ 6,956,000,000 |  |  |
Estimated asbestos related liability payments over the next 12 months | 2,000,000 |  |  |
Proceeds from Legal Settlements | 2,842,000 |  |  |
Product related aggregate liability | 5,635,000,000 |  |  |
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Asbestos-related aggregate liability - Maximum | 5,400,000 |  |  |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Asbestos-related aggregate liability - Maximum | 9,700,000 |  |  |
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 | 17,727,000 | $ 8,444,000 |  |
Accrued Liabilities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual, Product Liability, Gross | 3,500,000 |  |  |
Gain (Loss) Related to Litigation Settlement | 1,500,000 |  |  |
Tax Year 2003/2004 [Member] | Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Alleged Taxes Owed | 2,200,000 |  |  |
Tax Year 2003/2004 [Member] | Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Alleged Taxes Owed | 3,000,000 |  |  |
Magnetek [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Accrual for Environmental Loss Contingencies | 523,000 |  |  |
Asbestos-related aggregate liability - Maximum | 565,000 |  |  |
Magnetek [Member] | Bridgeport Facility [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Accrual for Environmental Loss Contingencies | $ 377,000 |  |  |

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