OTHER FINANCIAL INFORMATION (Schedule of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Condensed Income Statements, Captions [Line Items]
Amortization of discount and issue costs			$ 5,219	$ 7,606
Other interest expense	$ 378	$ 252	599	410
Total interest expense	3,857	5,555	7,934	11,011
2020 Convertible Notes [Member]
Condensed Income Statements, Captions [Line Items]
Stated interest		498	93	996
Amortization of discount and issue costs		1,495	289	2,951
Interest expense on convertible notes		1,993	382	3,947
2025 Convertible Notes [Member]
Condensed Income Statements, Captions [Line Items]
Stated interest	1,150	1,150	2,313	2,326
Amortization of discount and issue costs	2,329	2,160	4,640	4,328
Interest expense on convertible notes	$ 3,479	$ 3,310	$ 6,953	$ 6,654