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Goodwill and Intangible Assets (Narrative) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) Reporting_Unit | Dec. 31, 2019 USD ($) | Mar. 31, 2020 USD ($)
Goodwill [Line Items] |  |  |  |  |
Number of Reporting Units | Reporting_Unit |  |  | 2 |  |
Amortization of intangibles | $ 3,142,000 | $ 3,229,000 | $ 9,449,000 | $ 9,708,000 |
Goodwill | 338,995,000 |  | 338,995,000 |  | $ 319,679,000
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year | 12,600,000 |  | 12,600,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 12,600,000 |  | 12,600,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 12,600,000 |  | 12,600,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 12,600,000 |  | 12,600,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 12,600,000 |  | 12,600,000 |  |
Indefinite-Lived Trademarks | 48,686,000 |  | 48,686,000 |  | 46,670,000
Goodwill, Impaired, Accumulated Impairment Loss | 113,174,000 |  | 113,174,000 |  | 113,174,000
Rest of Products [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 329,285,000 |  | 329,285,000 |  | 310,086,000
Duff Norton Group [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 9,710,000 |  | $ 9,710,000 |  | $ 9,593,000
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] | Other Intangible Assets [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 5 years |  |
Forecast [Member] | Technology-Based Intangible Assets [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 18 years |  |

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