DEBT Convertible debt Tables (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Debt Instrument [Line Items]
Unamortized discount	$ (36,400)
Debt component - net carrying value	1,513,999	$ 1,293,364
Amortization of debt discount	1,701	1,606	$ 1,000
Convertible debt \| 4½% Convertible Senior Notes
Debt Instrument [Line Items]
Equity component - net carrying value (1)	36,778
Face amount due at maturity	143,750
Unamortized discount	(36,353)
Debt component - net carrying value	$ 107,397	$ 0
Debt Instrument, Interest Rate, Effective Percentage	11.00%
Contractual coupon interest	$ 1,851
Amortization of debt discount	1,454
Total interest expense	3,305
Convertible debt \| 4½% Convertible Senior Notes \| Debt Issuance Cost
Debt Instrument [Line Items]
Equity component - net carrying value (1)	$ 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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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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