Goodwill and Intangible Assets (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 3,226,000	$ 3,754,000	$ 6,479,000	$ 7,657,000
Goodwill [Roll Forward]
Balance at April 1, 2019			322,816,000
Currency translation			(5,200,000)
Balance at September 30, 2019	317,616,000		317,616,000
Gross Carrying Amount	280,634,000		280,634,000		$ 285,490,000
Accumulated Amortization	(57,935,000)		(57,935,000)		(52,550,000)
Net	222,699,000		222,699,000		232,940,000
Indefinite-Lived Trademarks	46,436,000		46,436,000		46,981,000
Trademark
Goodwill [Roll Forward]
Gross Carrying Amount	6,178,000		6,178,000		6,212,000
Accumulated Amortization	(4,292,000)		(4,292,000)		(4,138,000)
Net	1,886,000		1,886,000		2,074,000
Indefinite-lived Intangible Assets [Member]
Goodwill [Roll Forward]
Accumulated Amortization	0		0		0
Customer relationships
Goodwill [Roll Forward]
Gross Carrying Amount	178,183,000		178,183,000		182,328,000
Accumulated Amortization	(39,097,000)		(39,097,000)		(35,344,000)
Net	139,086,000		139,086,000		146,984,000
Unpatented Technology [Member]
Goodwill [Roll Forward]
Gross Carrying Amount	46,635,000		46,635,000		46,715,000
Accumulated Amortization	(11,850,000)		(11,850,000)		(10,412,000)
Net	34,785,000		34,785,000		36,303,000
Other
Goodwill [Roll Forward]
Gross Carrying Amount	3,202,000		3,202,000		3,254,000
Accumulated Amortization	(2,696,000)		(2,696,000)		(2,656,000)
Net	$ 506,000		$ 506,000		$ 598,000