OTHER FINANCIAL INFORMATION (Schedule of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Interest expense on convertible senior unsecured notes:
Stated interest at 1.625% per annum	$ 701	$ 685	$ 2,103	$ 1,567
Amortization of note discount	1,562	1,370	4,631	3,106
Amortization of debt issue costs	199	175	590	396
Interest expense on convertible notes	2,462	2,230	7,324	5,069
Other interest expense	17	22	53	111
Total interest expense	$ 2,479	$ 2,252	$ 7,377	$ 5,180
Convertible Senior Notes [Member]
Condensed Income Statements, Captions [Line Items]
Interest rate (as a percent)	1.625%		1.625%