GOODWILL AND INTANGIBLES - Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017
Schedule of Intangible Assets [Line Items]
Beginning Gross Carrying Amount	$ 150,120	$ 108,467
Additions	13,323	41,653
Accumulated Amortization	(53,768)	(51,850)
Impact of Foreign Currency Translation	(866)
Ending Intangible Assets, Net	108,809	98,270
Goodwill	34,487	27,546	$ 16,463
North America
Schedule of Intangible Assets [Line Items]
Goodwill	2,795	2,795
Other Regions
Schedule of Intangible Assets [Line Items]
Goodwill	$ 31,692	24,751
Customer relationship intangible
Schedule of Intangible Assets [Line Items]
Weighted Average Remaining Useful Life	10 years 2 months 19 days
Beginning Gross Carrying Amount	$ 58,530	58,530
Additions	5,450	0
Accumulated Amortization	(26,010)	(25,005)
Impact of Foreign Currency Translation	0
Ending Intangible Assets, Net	$ 37,970	33,525
Production and supply contract intangibles
Schedule of Intangible Assets [Line Items]
Weighted Average Remaining Useful Life	3 years 6 months 22 days
Beginning Gross Carrying Amount	$ 14,893	14,893
Additions	0	0
Accumulated Amortization	(9,178)	(8,774)
Impact of Foreign Currency Translation	0
Ending Intangible Assets, Net	$ 5,715	6,119
Internally developed software intangible
Schedule of Intangible Assets [Line Items]
Weighted Average Remaining Useful Life	2 years 10 months 24 days
Beginning Gross Carrying Amount	$ 18,812	18,581
Additions	199	231
Accumulated Amortization	(17,970)	(17,828)
Impact of Foreign Currency Translation	0
Ending Intangible Assets, Net	$ 1,041	984
License intangibles
Schedule of Intangible Assets [Line Items]
Weighted Average Remaining Useful Life	19 years 7 months 6 days
Beginning Gross Carrying Amount	$ 30,339	0
Additions	0	30,339
Accumulated Amortization	(594)	(243)
Impact of Foreign Currency Translation	(633)
Ending Intangible Assets, Net	$ 29,112	30,096
Trade names
Schedule of Intangible Assets [Line Items]
Weighted Average Remaining Useful Life	7 years 9 months
Beginning Gross Carrying Amount	$ 0
Additions	500
Accumulated Amortization	(16)
Impact of Foreign Currency Translation	0
Ending Intangible Assets, Net	484
Goodwill
Schedule of Intangible Assets [Line Items]
Beginning Gross Carrying Amount	27,546	16,463
Additions	7,174	11,083
Impact of Foreign Currency Translation	(233)
Ending Intangible Assets, Net	$ 34,487	$ 27,546