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Loss Contingencies (Narratives) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual, Product Liability, Gross | $ 768,000 |  |  |
Loss Contingency Alleged Taxes Owed | 7,500,000 |  |  |
Loss Contingency Alleged Taxes Owed Including Penalties And Interest | 3,100,000 |  |  |
Accrual for Environmental Loss Contingencies | $ 1,143,000 |  |  |
Malpractice Loss Contingency, Discount Rate | 65.00% |  |  |
Aggregate amount of reserves | $ 11,944,000 | $ 12,686,000 | $ 13,582,000 | $ 13,335,000
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 | $ 4,753,000,000 |  |  |
Estimated asbestos related liability payments over the next 12 months | 2,000,000 |  |  |
Product Liability Contingency, Third Party Recovery | 2,650,000 |  |  |
Proceeds from Legal Settlements | 381,000 | 484,000 |  |
Product related aggregate liability | 6,423,000,000 |  |  |
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Asbestos-related aggregate liability - Maximum | 3,800,000 |  |  |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Asbestos-related aggregate liability - Maximum | 6,900,000 |  |  |
Litigation Settlement, Amount Awarded from Other Party | 1,650,000 |  |  |
Monsanto [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated Litigation Liability | 100,000 |  |  |
Other Noncurrent Liabilities [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual, Product Liability, Gross | 8,444,000 | $ 9,185,000 |  |
Accrued Liabilities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual, Product Liability, Gross | 3,500,000 |  |  |
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 | 2,900,000 |  |  |
Magnetek [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Accrual for Environmental Loss Contingencies | 464,000 |  |  |
Magnetek [Member] | Bridgeport Facility [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Accrual for Environmental Loss Contingencies | $ 352,000 |  |  |

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