QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 86,126	$ 83,350	$ 90,479	$ 91,147	$ 70,807	$ 74,675	$ 69,808	$ 65,429	$ 351,102	$ 280,719	$ 250,606
Gross profit	$ 35,787	$ 35,117	$ 37,614	$ 34,834	$ 27,556	$ 26,574	$ 25,303	$ 23,526	$ 143,352	$ 102,959	$ 87,404
Gross margin	41.60%	42.10%	41.60%	38.20%	38.90%	35.60%	36.20%	36.00%	40.80%	36.70%	34.90%
Net income (loss)	$ (4,239)	$ (1,527)	$ 521	$ (2,659)	$ 5,506	$ 3,876	$ 3,499	$ 4,059	$ (7,904)	$ 16,940	$ 16,508
Earnings (loss) per diluted share	$ (0.12)	$ (0.04)	$ 0.01	$ (0.07)	$ 0.15	$ 0.10	$ 0.10	$ 0.11	$ (0.22)	$ 0.46	$ 0.45