OTHER FINANCIAL INFORMATION (Schedule of Interest Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Interest expense on convertible senior unsecured notes:
Stated interest at 1.625% per annum	$ 2,806	$ 2,803	$ 2,268
Amortization of note discount	6,627	6,232	4,613
Amortization of debt issue costs	845	795	588
Total interest expense on convertible notes	10,278	9,830	7,469
Other interest expense	2	66	126
Total interest expense	$ 10,280	$ 9,896	$ 7,595
Convertible Senior Notes [Member]
Interest expense on convertible senior unsecured notes:
Interest rate (as a percent)	1.625%	1.625%	1.625%