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REGULATORY MATTERS: Idaho Fixed Cost Adjustment (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2026
Jun. 01, 2025
Jun. 01, 2024
Jun. 01, 2023
Idaho Fixed Cost Adjustment [Line Items]        
Annual fixed cost adjustment mechanism deferral   $ (3,100) $ 36,800 $ 25,100
Subsequent Event | Idaho Jurisdiction Fixed Cost Adjustment        
Idaho Fixed Cost Adjustment [Line Items]        
Approved Rate Increase (Decrease), Amount $ (39,800)      
Idaho Fixed Cost Adjustment [Member]        
Idaho Fixed Cost Adjustment [Line Items]        
Percentage cap on the FCA adjustment     3.00%