STOCKHOLDERS EQUITY AND STOCK-BASED COMPENSATION (Details 3) - shares	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
RSUs granted (in thousands)	(209,000)	(170,000)
Shares withheld for tax and not issued (in thousands)	40,000	9,000	6,000
Stock Option and RSU Transactions
Available shares, beginning (in thousands)	1,137	1,650	1,147
Additional shares reserved (in thousands)			1,196
Options granted (in thousands)	(303)	(297)	(738)
RSUs granted (in thousands)	(522)	(340)	(25)
RSUs cancelled (in thousands)	10	1
Shares withheld for tax and not issued (in thousands)	(15)	9	6
Options terminated (in thousands)	105	455	457
Options expired (in thousands)		(341)	(393)
Available shares, ending (in thousands)	1,826	1,137	1,650