QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 84,380	$ 88,495	$ 96,037	$ 94,888	$ 94,395	$ 93,669	$ 89,767	$ 88,081	$ 363,800	$ 365,912	$ 351,102
Gross profit	$ 33,471	$ 36,381	$ 39,821	$ 38,091	$ 38,422	$ 38,187	$ 36,838	$ 37,443	$ 147,764	$ 150,890	143,352
Gross margin	39.70%	41.10%	41.50%	40.10%	40.70%	40.80%	41.00%	42.50%	40.60%	41.20%
Net income (loss)	$ 11,263	$ (522)	$ (854)	$ 8,511	$ (4,767)	$ 11,806	$ 12,232	$ (2,654)	$ 18,398	$ 16,617	$ (7,904)
Earnings (loss) per diluted share	$ 0.33	$ (0.02)	$ (0.02)	$ 0.23	$ (0.13)	$ 0.33	$ 0.34	$ (0.08)	$ 0.52	$ 0.46	$ (0.22)
Gain from legal settlement	$ 2,500	$ 2,500		$ 13,300		$ 13,300	$ 15,000		$ 18,333	$ 28,333
Loss on extinguishment of debt			$ 2,000						2,033
Legal provision previously reserved		$ 19,100
Temporary impairment									$ 5,000
Accrual for litigation								$ 6,100