OTHER FINANCIAL INFORMATION (Schedule of Interest Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015	May 31, 2015
Interest expense on convertible senior unsecured notes:
Stated interest at 1.625% per annum	$ 2,803	$ 2,268
Amortization of note discount	6,232	4,613
Amortization of debt issue costs	795	588
Total interest expense on convertible notes	9,830	7,469
Other interest expense	66	126	296
Total interest expense	$ 9,896	$ 7,595	$ 296
Convertible Senior Notes [Member]
Condensed Income Statements, Captions [Line Items]
Interest rate (as a percent)	1.625%	1.625%	1.625%	1.625%