STOCK-BASED COMPENSATION (Details 3) - Outstanding Options Stock Option Transactions [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Feb. 28, 2022	Nov. 30, 2021	Aug. 31, 2021	Feb. 28, 2022
Options outstanding, beginning (in thousands)	1,713	2,325	2,766	2,766
Options granted (in thousands)	2	10	206
Options cancelled (in thousands)	(41)	(51)	(6)
Options exercised (in thousands)	(66)	(571)	(641)
Options outstanding, ending (in thousands)	1,608	1,713	2,325	1,608
Options fully vested and expected to vest (in thousands)	1,582			1,582
Weighted average exercise price outstanding, beginning	$ 2.26	$ 2.14	$ 2.16	$ 2.16
Weighted average exercise price Options granted	11.55	19.85	2.93
Weighted average exercise price Options cancelled	1.22	1.73	1.95
Weighted average exercise price Options exercised	2.03	2.14	2.46
Weighted average exercise price outstanding, ending	2.29	2.26	$ 2.14	2.29
Weighted average exercise price fully vested and expected to vest	$ 2.30	$ 4.22		$ 2.30
Aggregate intrinsic value, beginning	$ 25,997	$ 12,365	$ 807	$ 807
Aggregate intrinsic value, ending	18,248	$ 25,997	$ 12,365	18,248
Aggregate intrinsic value for options fully vested and expected to vest	$ 17,952			$ 17,952