FINANCING ARRANGEMENTS (Schedule of Balances Attributable to Notes) (Details) - USD ($) $ in Thousands	Nov. 30, 2016	Feb. 29, 2016	May 31, 2015
Liability component:
1.625% convertible senior unsecured notes	$ 145,021	$ 139,800
Convertible Senior Notes [Member]
Liability component:
Term loan amount	172,500	172,500
Less: Unamortized debt discount	(24,371)	(29,002)	$ (33,600)
Unamortized debt issuance costs	(3,108)	(3,698)
1.625% convertible senior unsecured notes	$ 145,021	$ 139,800

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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Amount, after accumulated amortization, of debt discount.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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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