Goodwill and Other Intangibles Goodwill and Intangible Asset Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 16,463	$ 2,794
Goodwill, Additions		13,669
Goodwill, ending balance	16,463	16,463	$ 2,794
Gross balance			69,889
Accumulated amortization			(37,998)
Finite-lived Intangible Assets [Roll Forward]
Goodwill and Intangible Assets, Net	67,034	31,891
Additions	79	38,499
Amortization expense	(4,514)	(3,356)	(3,532)
Net balance	46,136
Goodwill and Intangible Assets, Net	62,599	67,034	31,891
North America
Goodwill [Roll Forward]
Goodwill, ending balance	2,794
Other Regions
Goodwill [Roll Forward]
Goodwill, ending balance	$ 13,669
Customer Relationships Intangible
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2017	12 years
Goodwill [Roll Forward]
Gross carrying amount			33,700
Accumulated amortization			(16,639)
Finite-lived Intangible Assets [Roll Forward]
Net balance	$ 40,206	17,061
Additions	0	24,830
Amortization expense	(3,340)	(1,685)
Net balance	$ 36,866	40,206	17,061
Production and Supply Contract Intangibles
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2017	4 years 3 months
Goodwill [Roll Forward]
Gross carrying amount			14,893
Accumulated amortization			(5,786)
Finite-lived Intangible Assets [Roll Forward]
Net balance	$ 8,282	9,107
Additions	0	0
Amortization expense	(432)	(825)
Net balance	$ 7,850	8,282	9,107
Internally Developed Software Intangible
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2017	3 years
Goodwill [Roll Forward]
Gross carrying amount			18,502
Accumulated amortization			(15,573)
Finite-lived Intangible Assets [Roll Forward]
Net balance	$ 2,083	2,929
Additions	79	0
Amortization expense	(742)	(846)
Net balance	$ 1,420	$ 2,083	$ 2,929