STOCK-BASED COMPENSATION (Details 4) - Outstanding Options Stock Option Transactions - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Options outstanding, beginning (in thousands)	1,597	2,766	3,153
Options granted (in thousands)	110	303	297
Options terminated (in thousands)	(16)	(105)	(455)
Options exercised (in thousands)	(730)	(1,367)	(229)
Options outstanding, ending (in thousands)	961	1,597	2,766
Options fully vested and expected to vest (in thousands)	947
Weighted average exercise price outstanding, beginning	$ 2.70	$ 2.16	$ 2.17
Weighted average exercise price granted	9.06	5.37	1.78
Weighted average exercise price terminated	5.42	1.59	2.31
Weighted average exercise price exercised	2.32	2.28	1.54
Weighted average exercise price outstanding, ending	3.67	$ 2.70	$ 2.16
Weighted average exercise price fully vested and expected to vest	$ 3.66
Aggregate intrinsic value, beginning	$ 9,290	$ 807	$ 102
Aggregate intrinsic value, ending	28,211	$ 9,290	$ 807
Aggregate intrinsic value for options fully vested and expected to vest	$ 27,796