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SEGMENT AND GEOGRAPHIC DATA (Details) - USD ($)
$ 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
Segment Reporting Information [Line Items]                      
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%
Operating income                 $ 123 $ 28,085 $ 24,940
Sales Revenue, Segment [Member] | Product Concentration Risk [Member]                      
Segment Reporting Information [Line Items]                      
Concentration percentage                 4.00% 14.00% 15.00%
Assets, Total [Member]                      
Segment Reporting Information [Line Items]                      
Concentration percentage                   2.00%  
Liabilities, Total [Member]                      
Segment Reporting Information [Line Items]                      
Concentration percentage                   2.00%  
United States [Member] | Sales Revenue, Net [Member]                      
Segment Reporting Information [Line Items]                      
Concentration percentage                 74.00% 83.00% 79.00%
Operating Segments [Member] | Wireless Datacom [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 $ 336,033 $ 241,387 $ 213,119
Gross profit                 $ 139,623 $ 91,976 $ 77,899
Gross margin                 41.60% 38.10% 36.60%
Operating income                 $ 6,937 $ 26,501 $ 23,833
Operating Segments [Member] | Satellite [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 15,069 39,332 37,487
Gross profit                 $ 3,729 $ 10,983 $ 9,505
Gross margin                 24.70% 27.90% 25.40%
Operating income                 $ 1,547 $ 8,064 $ 5,017
Corporate Expenses [Member]                      
Segment Reporting Information [Line Items]                      
Operating income                 $ (8,361) $ (6,480) $ (3,910)