OTHER FINANCIAL INFORMATION (Schedule of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Interest expense on convertible senior unsecured notes:
Stated interest at 1.625% per annum	$ 701	$ 701	$ 2,106	$ 2,103
Amortization of note discount	1,661	1,562	4,924	4,631
Amortization of debt issue costs	211	199	627	590
Interest expense on convertible notes	2,573	2,462	7,657	7,324
Other interest expense		17	1	53
Total interest expense	$ 2,573	$ 2,479	$ 7,658	$ 7,377
Convertible Senior Notes [Member]
Condensed Income Statements, Captions [Line Items]
Interest rate (as a percent)	1.625%	1.625%	1.625%	1.625%