Goodwill and Intangible Assets (Narrative) (Details)	3 Months Ended
	Jun. 30, 2020 USD ($) Reporting_Unit	Jun. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)
Goodwill [Line Items]
Number of Reporting Units | Reporting_Unit	2
Amortization of intangibles	$ 3,115,000	$ 3,253,000
Goodwill	322,914,000		$ 319,679,000
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	12,500,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	12,500,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	12,500,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	12,500,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	12,500,000
Indefinite-Lived Trademarks	47,007,000		46,670,000
Goodwill, Impaired, Accumulated Impairment Loss	113,174,000		113,174,000
Rest of Products [Member]
Goodwill [Line Items]
Goodwill	313,301,000		310,086,000
Duff Norton Group [Member]
Goodwill [Line Items]
Goodwill	$ 9,613,000		$ 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