Goodwill and Intangible Assets (Narrative) (Details)		3 Months Ended		6 Months Ended
	Apr. 07, 2021	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Reporting_Unit	Sep. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)
Goodwill [Line Items]
Number of Reporting Units | Reporting_Unit				3
Amortization of intangibles		$ 6,285,000	$ 3,192,000	$ 12,394,000	$ 6,307,000
Goodwill		615,329,000		615,329,000		$ 331,176,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two		24,800,000		24,800,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three		24,800,000		24,800,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four		24,800,000		24,800,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five		24,800,000		$ 24,800,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years			17 years
Indefinite-Lived Trademarks		47,595,000		$ 47,595,000		47,857,000
Goodwill, Impaired, Accumulated Impairment Loss		113,174,000		113,174,000
Finite-Lived Intangible Asset, Expected Amortization, Year One		24,800,000		24,800,000
Rest of Products [Member]
Goodwill [Line Items]
Goodwill		318,990,000		318,990,000		321,477,000
Duff Norton Group [Member]
Goodwill [Line Items]
Goodwill						$ 9,699,000
Dorner
Goodwill [Line Items]
Goodwill		$ 286,640,000		$ 286,640,000
Trademark
Goodwill [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				13 years
Customer relationships
Goodwill [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				17 years
Other Intangible Assets [Member]
Goodwill [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				5 years
Technology-Based Intangible Assets [Member]
Goodwill [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				16 years