OTHER FINANCIAL INFORMATION (Schedule of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	May 31, 2019	May 31, 2018
Condensed Income Statements, Captions [Line Items]
Total interest expense	$ 5,456	$ 2,665
2020 Convertible Notes [Member]
Condensed Income Statements, Captions [Line Items]
Stated interest	498	701
Amortization of note discount	1,293	1,713
Amortization of debt issue costs	163	218
Interest expense on convertible notes	1,954	2,632
2025 Convertible Notes [Member]
Condensed Income Statements, Captions [Line Items]
Stated interest	1,176
Amortization of note discount	2,019
Amortization of debt issue costs	149
Interest expense on convertible notes	3,344
Other interest expense	158	33
Total interest expense	$ 5,456	$ 2,665