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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2023
Feb. 28, 2022
Feb. 28, 2023
Feb. 28, 2022
Purchase Commitment, Excluding Long-Term Commitment [Line Items]        
Cost of revenues $ 10,533 $ 2,073 $ 28,438 $ 2,073
Energy Service        
Purchase Commitment, Excluding Long-Term Commitment [Line Items]        
Contractual obligation $ 24,200   $ 24,200  
Service contract, term     5 years