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STOCK-BASED COMPENSATION (Details 2) - Stock Option and RSU Transactions [Member] - shares
shares in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2022
Nov. 30, 2021
Aug. 31, 2021
Feb. 28, 2022
Available shares, beginning 1,856 685 1,137 1,137
Options reserved   1,414    
Options granted (2) (10) (206)  
RSUs granted   (14) (238)  
RSUs cancelled 10      
Options cancelled and adjusted 41 51 (8)  
RSUs - performance grants   (270)    
Available shares, ending 1,905 1,856 685 1,905