FINANCING ARRANGEMENTS (Schedule of Balances Attributable to Notes) (Details) - USD ($) $ in Thousands	Nov. 30, 2018	Jul. 20, 2018	Feb. 28, 2018
Debt Instrument [Line Items]
Net carrying amount of the Convertible Notes	$ 272,420		$ 154,299
2020 Convertible Notes [Member]
Debt Instrument [Line Items]
Principal	122,527		172,500
Less: Unamortized debt discount	(7,748)		(16,143)
Unamortized debt issuance costs	(979)		(2,058)
Net carrying amount of the Convertible Notes	113,800		$ 154,299
2025 Convertible Notes [Member]
Debt Instrument [Line Items]
Principal	230,000
Less: Unamortized debt discount	(66,460)	$ (69,200)
Unamortized debt issuance costs	(4,920)	$ (7,300)
Net carrying amount of the Convertible Notes	$ 158,620

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt discount.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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