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Goodwill and Intangible Assets (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) Reporting_Unit | Dec. 31, 2018 USD ($) | Mar. 31, 2020 | Mar. 31, 2019 USD ($)
Goodwill [Line Items] |  |  |  |  |  |
Number of Reporting Units | Reporting_Unit |  |  | 2 |  |  |
Amortization of intangibles | $ 3,229,000 | $ 3,701,000 | $ 9,708,000 | $ 11,358,000 |  |
Goodwill | 322,766,000 |  | 322,766,000 |  |  | $ 322,816,000
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year | 13,000,000 |  | 13,000,000 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 13,000,000 |  | 13,000,000 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 13,000,000 |  | 13,000,000 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 13,000,000 |  | 13,000,000 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 13,000,000 |  | 13,000,000 |  |  |
Indefinite-Lived Trademarks | 46,971,000 |  | 46,971,000 |  |  | 46,981,000
Goodwill, Impaired, Accumulated Impairment Loss | 113,174,000 |  | 113,174,000 |  |  | 113,174,000
Rest of Products [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 313,155,000 |  | 313,155,000 |  |  | 313,205,000
Duff Norton Group [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 9,611,000 |  | $ 9,611,000 |  |  | $ 9,611,000
Forecast [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 18 years |
Forecast [Member] | Trademark |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 15 years |
Forecast [Member] | Customer relationships |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 18 years |
Forecast [Member] | Patented Technology [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 18 years |
Forecast [Member] | Other Intangible Assets [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 6 years |

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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