Goodwill and Intangibles - Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2019
Schedule of Intangible Assets [Line Items]
Beginning Gross Carrying Amount	$ 165,910	$ 150,120
Additions	361	17,220
Accumulated Amortization	(65,179)	(59,793)
Impact of Foreign Currency Translation	882	(1,430)
Ending Intangible Assets, Net	101,974	106,117
Amortization of intangible assets	$ 5,386	$ 7,943
Customer relationships
Schedule of Intangible Assets [Line Items]
Weighted Average Remaining Useful Life	8 years 10 months 17 days	9 years 6 months 18 days
Beginning Gross Carrying Amount	$ 63,980	$ 58,530
Additions	0	5,450
Accumulated Amortization	(32,043)	(29,027)
Impact of Foreign Currency Translation	0	0
Ending Intangible Assets, Net	$ 31,937	$ 34,953
Production and supply contracts
Schedule of Intangible Assets [Line Items]
Weighted Average Remaining Useful Life	2 years 3 months	2 years 11 months 4 days
Beginning Gross Carrying Amount	$ 14,893	$ 14,893
Additions	0	0
Accumulated Amortization	(11,210)	(10,668)
Impact of Foreign Currency Translation	0	0
Ending Intangible Assets, Net	$ 3,683	$ 4,225
Internally developed software
Schedule of Intangible Assets [Line Items]
Weighted Average Remaining Useful Life	3 years 3 months 7 days	3 years 9 months 14 days
Beginning Gross Carrying Amount	$ 19,917	$ 18,812
Additions	243	1,105
Accumulated Amortization	(18,807)	(18,391)
Impact of Foreign Currency Translation	0	0
Ending Intangible Assets, Net	$ 1,353	$ 1,526
Licenses
Schedule of Intangible Assets [Line Items]
Weighted Average Remaining Useful Life	17 years 3 months 3 days	18 years 29 days
Beginning Gross Carrying Amount	$ 32,284	$ 30,339
Additions	118	2,991
Accumulated Amortization	(3,010)	(1,644)
Impact of Foreign Currency Translation	648	(1,046)
Ending Intangible Assets, Net	$ 30,040	$ 30,640
Trade names
Schedule of Intangible Assets [Line Items]
Weighted Average Remaining Useful Life	6 years 3 months	7 years
Beginning Gross Carrying Amount	$ 500	$ 0
Additions	0	500
Accumulated Amortization	(109)	(63)
Impact of Foreign Currency Translation	0	0
Ending Intangible Assets, Net	391	437
Goodwill
Schedule of Intangible Assets [Line Items]
Beginning Gross Carrying Amount	34,336	27,546
Additions	0	7,174
Impact of Foreign Currency Translation	234	(384)
Ending Intangible Assets, Net	$ 34,570	$ 34,336