DEBT Schedules of convertible debt (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017
Debt Instrument [Line Items]
Debt component - net carrying value	$ 1,215,266	$ 1,215,266		$ 1,293,364
Debt Instrument, Interest Rate, Effective Percentage	11.00%	11.00%
Amortization of debt discount		$ 343	$ 1,314
Convertible Debt \| 4½% Convertible Senior Notes due 2023
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	(37,626)	(37,626)
Debt component - net carrying value	106,124	106,124		$ 0
Contractual coupon interest	234	234
Amortization of debt discount	181	181
Total interest expense	415	415
Convertible Debt \| 4½% Convertible Senior Notes due 2023 \| Debt Issuance Cost [Member]
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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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Face (par) amount of debt instrument at time of issuance.

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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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Amount, after accumulated amortization, of debt discount.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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