OTHER FINANCIAL INFORMATION (Schedule of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2019	Aug. 31, 2018
Condensed Income Statements, Captions [Line Items]
Other interest expense	$ 252	$ 53	$ 410	$ 86
Total interest expense	5,555	3,767	11,011	6,432
2020 Convertible Notes [Member]
Condensed Income Statements, Captions [Line Items]
Stated interest	498	611	996	1,312
Amortization of note discount	1,327	1,515	2,620	3,228
Amortization of debt issue costs	168	176	331	394
Interest expense on convertible notes	1,993	2,302	3,947	4,934
2025 Convertible Notes [Member]
Condensed Income Statements, Captions [Line Items]
Stated interest	1,150	511	2,326	511
Amortization of note discount	2,012	839	4,031	839
Amortization of debt issue costs	148	62	297	62
Interest expense on convertible notes	$ 3,310	$ 1,412	$ 6,654	$ 1,412