DEBT - INTEREST EXPENSE COMPONENTS (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Jun. 18, 2013
Debt Instrument [Line Items]
Non-cash amortization of discount on Convertible Notes	$ 15,662	$ 21,222	$ 23,457
Amortization of debt issuance costs	$ 578	1,227	1,567
1.75% Convertible Notes due 2016
Debt Instrument [Line Items]
Interest rate	1.75%
1.00% Convertible Notes due 2018
Debt Instrument [Line Items]
Interest rate	1.00%
Convertible Debt \| 1.00% Convertible Notes due 2018
Debt Instrument [Line Items]
Interest rate	1.00%			1.00%
Cash interest expense (coupon interest expense)	$ 539	2,784	2,875
Non-cash amortization of discount on Convertible Notes	15,662	14,221	12,085
Amortization of debt issuance costs	466	453	443
Total interest expense related to Convertible Notes	$ 16,667	$ 17,458	$ 15,403

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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Amount of amortization expense attributable to debt issuance costs.

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Contractual interest rate for funds borrowed, under the debt agreement.

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