OTHER FINANCIAL INFORMATION (Schedule of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Interest expense on convertible senior unsecured notes:
Stated interest at 1.625% per annum	$ 704	$ 701	$ 1,405	$ 1,402
Amortization of note discount	1,653	1,562	3,263	3,069
Amortization of debt issue costs	210	199	416	391
Interest expense on convertible notes	2,567	2,462	5,084	4,862
Other interest expense		12	1	36
Total interest expense	$ 2,567	$ 2,474	$ 5,085	$ 4,898
Convertible Senior Notes [Member]
Condensed Income Statements, Captions [Line Items]
Interest rate (as a percent)	1.625%	1.625%	1.625%	1.625%