DEBT Convertible debt Tables (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Unamortized discount	$ (33,400)
Debt component - net carrying value	1,448,624	$ 1,513,999
Amortization of debt discount	6,337	1,701	$ 1,606
Convertible debt \| 4½% Convertible Senior Notes
Debt Instrument [Line Items]
Equity component - net carrying value (1)	36,778	36,778
Face amount due at maturity	143,750	143,750
Unamortized discount	(30,806)	(36,353)
Debt component - net carrying value	$ 112,944	107,397
Debt Instrument, Interest Rate, Effective Percentage	11.00%
Contractual coupon interest	$ 6,475	1,851
Amortization of debt discount	5,547	1,454
Total interest expense	12,022	3,305
Convertible debt \| 4½% Convertible Senior Notes \| Debt Issuance Cost
Debt Instrument [Line Items]
Equity component - net carrying value (1)	$ 1,000	$ 1,000

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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