COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Thousands, R$ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($)	Mar. 31, 2018 USD ($) tax_assessment	Mar. 31, 2018 BRL (R$) tax_assessment	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Inventory impairment and other	$ 92,900	$ 6,251		$ 92,915	$ 61,006
Brazil | Assessment of Sales and Import Taxes
Loss Contingencies [Line Items]
Number of tax assessments | tax_assessment		6	6
Estimate of possible loss		$ 104,000	R$ 346
SunEdison, Inc
Loss Contingencies [Line Items]
Inventory impairment and other				$ 92,900	61,000
Sales returns recognized					90,000
Pending Litigation | SunEdison, Inc Filed Chapter 11 | Collectibility of Receivables
Loss Contingencies [Line Items]
Inventory received					98,600
Cash received					$ 69,200