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FINANCING ARRANGEMENTS (Long-term Debt) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended	9 Months Ended
	May. 31, 2015	Nov. 30, 2015	Nov. 30, 2014	Apr. 17, 2015
Debt Instrument [Line Items]
Issuance costs attributable to the liability component		$ 5,291
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt issuance	$ 172,500	$ 172,500
Interest rate (as a percent)	1.625%	1.625%
Net proceeds from sale of the Notes	$ 167,200
Unamortized issuance costs	5,300	$ 3,890
Net proceeds used to pay the cost of the convertible note hedge transactions	$ 15,400
Maturity date	May 15, 2020
Conversion rate of shares of common stock		36.2398
Conversion price (in dollars per share)		$ 27.594
Percentage of repurchase price of the principal amount		100.00%
Maximum number of shares of common stock that could be issued, following certain corporate events that occur prior to maturity		2.5
Discount rate (as a percent)		6.20%
Conversion premium		$ 33,600
Debt discount to be amortized		$ 30,509		$ 33,600
Effective interest rate		6.20%
Deferred tax asset related to notes issuance		$ 400
Deferred tax asset related to equity component of issuance costs		1,000
Fair value of the Notes		165,000		$ 138,900
Deferred tax effect of conversion feature		16,000
Issuance costs attributable to the liability component		$ 4,300
Debt Instrument, Covenant Description		The Indenture contains customary terms and conditions, including that upon certain events of default occurring and continuing, either the Trustee or the holders of at least 25% in aggregate principal amount of the then outstanding Notes, by notice to the Company and the Trustee, may declare 100% of the principal amount of, and accrued and unpaid interest, if any, on all the Notes then outstanding to be due and payable immediately. Such events of default include, without limitation, the default by the Company or any of its subsidiaries with respect to indebtedness for borrowed money in excess of $10 million and the entry of judgments for the payment of $10 million or more against the Company or any of its subsidiaries which are not paid, discharged or stayed within 60 days.