Goodwill and Other Intangibles Goodwill and Intangible Asset Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 2,794	$ 2,794
Goodwill, Additions	13,669
Goodwill, ending balance	16,463	2,794	$ 2,794
Gross balance			69,191
Accumulated amortization			(34,466)
Finite-lived Intangible Assets [Roll Forward]
Goodwill and Intangible Assets, Net	31,891	34,725
Additions	38,499	698
Amortization expense	(3,356)	(3,532)	(4,632)
Net balance	50,571
Goodwill and Intangible Assets, Net	67,034	31,891	34,725
North America [Member]
Goodwill [Roll Forward]
Goodwill, ending balance	2,794
Other Regions [Member]
Goodwill [Roll Forward]
Goodwill, ending balance	$ 13,669
Customer Relationships Intangible [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2016	13 years
Goodwill [Roll Forward]
Gross carrying amount			33,700
Accumulated amortization			(14,954)
Finite-lived Intangible Assets [Roll Forward]
Net balance	$ 17,061	18,746
Additions	24,830	0
Amortization expense	(1,685)	(1,685)
Net balance	$ 40,206	17,061	18,746
Production and Supply Contract Intangibles [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2016	4 years 9 months
Goodwill [Roll Forward]
Gross carrying amount			14,893
Accumulated amortization			(4,752)
Finite-lived Intangible Assets [Roll Forward]
Net balance	$ 9,107	10,141
Additions	0	0
Amortization expense	(825)	(1,034)
Net balance	$ 8,282	9,107	10,141
Internally Developed Software Intangible [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2016	0 years
Goodwill [Roll Forward]
Gross carrying amount			17,804
Accumulated amortization			(14,760)
Finite-lived Intangible Assets [Roll Forward]
Net balance	$ 2,929	3,044
Additions	0	698
Amortization expense	(846)	(813)
Net balance	$ 2,083	$ 2,929	$ 3,044