OTHER FINANCIAL INFORMATION (Schedule of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	May 31, 2018	May 31, 2017
Interest expense on convertible senior unsecured notes:
Stated interest at 1.625% per annum	$ 701	$ 701
Amortization of note discount	1,713	1,610
Amortization of debt issue costs	218	206
Interest expense on convertible notes	2,632	2,517
Other interest expense	33	1
Total interest expense	$ 2,665	$ 2,518
Convertible Senior Notes [Member]
Condensed Income Statements, Captions [Line Items]
Interest rate (as a percent)	1.625%	1.625%