SEGMENT INFORMATION AND GEOGRAPHIC DATA (Summary of Adjusted EBITDA) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		15 Months Ended
	Aug. 31, 2019	May 31, 2019	Aug. 31, 2018	May 31, 2018	Aug. 31, 2019	Aug. 31, 2018	May 31, 2019
Segment Information Summary Of Adjustments Results Of Ebitda Details [Abstract]
Net income (loss)	$ (7,369)	$ (8,693)	$ (854)	$ 8,511	$ (16,062)	$ 7,657
Investment income	(1,256)		(1,007)		(3,337)	(1,860)
Interest expense	5,555		3,767		11,011	6,432
Income tax provision	(1,342)		(497)		(3,599)	1,274
Depreciation	5,191		2,298		9,036	4,341
Amortization of intangible assets	3,318		2,893		6,358	5,641
Stock-based compensation	3,183		2,680		5,726	5,147
Loss on extinguishment of debt			2,033			2,033
Impairment loss and equity in net loss of affiliate			530		530	969
Restructuring charges	2,272		566		2,272	3,949	$ 10,300
Non-recurring legal expenses	777		1,023		4,584	3,137
Acquisition and integration related expenses	46				1,190
Gain on LoJack battery performance legal Settlement						(13,333)
Other	272		257		507	479
Adjusted EBITDA	$ 10,647		$ 13,689		$ 18,216	$ 25,866