QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 94,395	$ 93,669	$ 89,767	$ 88,081	$ 86,126	$ 83,350	$ 90,479	$ 91,147	$ 365,912	$ 351,102	$ 280,719
Gross profit	$ 38,422	$ 38,187	$ 36,838	$ 37,443	$ 35,787	$ 35,117	$ 37,614	$ 34,834	$ 150,890	$ 143,352	102,959
Gross margin	40.70%	40.80%	41.00%	42.50%	41.60%	42.10%	41.60%	38.20%	41.20%	40.80%
Net income (loss)	$ (4,767)	$ 11,806	$ 12,232	$ (2,654)	$ (4,239)	$ (1,527)	$ 521	$ (2,659)	$ 16,617	$ (7,904)	$ 16,940
Earnings (loss) per diluted share	$ (0.13)	$ 0.33	$ 0.34	$ (0.08)	$ (0.12)	$ (0.04)	$ 0.01	$ (0.07)	$ 0.46	$ (0.22)	$ 0.46
Accrual for litigation				$ 6,100	$ 7,200
Gain from legal settlemen		$ 13,300	$ 15,000						$ 28,333