FINANCING ARRANGEMENTS AND CONTRACTUAL CASH OBLIGATIONS (Schedule of Balances Attributable to Notes) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May. 31, 2015	Feb. 29, 2016	Feb. 28, 2015
Liability component:
1.625% convertible senior unsecured notes		$ 139,800
Convertible Senior Notes [Member]
Liability component:
Term loan amount	$ 172,500	172,500
Less: Unamortized debt discount	(33,600)	(29,002)
Unamortized debt issuance costs	$ (5,300)	(3,698)
1.625% convertible senior unsecured notes		$ 139,800