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Loss Contingencies (Narratives) (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 02, 2012 USD ($) | Aug. 02, 2012 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 EUR (€) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  | $ 21,422,000 | $ 21,422,000 |  |  | $ 11,944,000 | $ 12,686,000
Loss Contingency Accrual, Product Liability, Gross |  |  | 21,422,000 | 21,422,000 |  |  | 11,944,000 |
Product Liability Contingency, Third Party Recovery |  |  |  | (3,338,000) |  |  |  |
Estimation of asbestos-related aggregate liability that is probable and estimable |  |  | 7,150,000 | 7,150,000 |  |  |  |
Estimation of product-related aggregate liability |  |  | 5,234,000 | 5,234,000 |  |  |  |
Loss Contingency Alleged Taxes Owed | $ 8,200,000 | € 6,700,000 |  |  |  |  |  |
Loss Contingency Alleged Taxes Owed Including Penalties And Interest | $ 3,400,000 | € 2,800,000 |  |  |  |  |  |
Accrual for Environmental Loss Contingencies |  |  | 899,000 | 899,000 |  |  |  |
Estimated Litigation Liability |  |  | 60,000 | 60,000 |  |  |  |
Loss Contingency Accrual, Provision |  |  |  | 3,749,000 |  |  | 3,233,000 |
Loss Contingency Accrual, Payments |  |  |  | (2,662,000) |  |  | (3,975,000) |
Estimated Insurance Recoveries |  |  | 8,391,000 | 8,391,000 |  |  | 0 |
Loss Contingency Accrual, Product Liability, Net |  |  | 13,031,000 | 13,031,000 |  |  | $ 11,944,000 |
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 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Product Liability Contingency, Third Party Recovery |  |  |  | 2,000,000 |  |  |  |
Estimation of asbestos-related aggregate liability that is probable and estimable |  |  | 5,400,000 | 5,400,000 |  |  |  |
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 |  |  | 9,700,000 | 9,700,000 |  |  |  |
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 |  |  | 626,000 | 626,000 |  |  |  |
Accrual for Environmental Loss Contingencies |  |  | 581,000 | 581,000 |  |  |  |
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 |  |  | 17,922,000 | 17,922,000 |  |  |  |
Accrued Liabilities |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss Contingency Accrual, Product Liability, Gross |  |  | 3,500,000 | 3,500,000 |  |  |  |
Gain (Loss) Related to Litigation Settlement |  |  | 1,500,000 |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Asbestos liability payments |  |  |  | $ 2,000,000 |  |  |  |
Loss settlement gross period |  |  |  | 12 months |  |  |  |
Loss Contingency Alleged Taxes Owed |  |  |  |  | $ 2,300,000 | € 1,900,000 |  |
Loss Contingency Alleged Taxes Owed Including Penalties And Interest |  |  |  |  | $ 3,200,000 | € 2,600,000 |  |
Forecast [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss contingency period |  |  |  | 37 years |  |  |  |
DEP [Member] | Magnetek [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies |  |  | $ 403,000 | $ 403,000 |  |  |  |

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