v3.26.1
Regulatory Matters (Details)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 28, 2026
USD ($)
case
Nov. 01, 2025
May 01, 2025
Apr. 29, 2025
USD ($)
period
Jun. 27, 2024
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jan. 31, 2024
USD ($)
Public Utilities, General Disclosures [Line Items]                    
Revenue credits           $ (0.2) $ (0.2) $ (0.3) $ (0.3)  
Water Plant                    
Public Utilities, General Disclosures [Line Items]                    
Construction cost included in rate base                   $ 7.8
ACC                    
Public Utilities, General Disclosures [Line Items]                    
Number of regulatory rate cases | case 2                  
Public utilities, interim rate increase (decrease), amount $ 0.4                  
Requested revenue increase       $ 1.1            
Amount disallowed 0.1                  
Return on equity, percentage       9.60%            
Requested rate, number of phase-in periods | period       3            
Requested equity capital structure (as a percent)   25.00% 50.00%              
Requested deferral of recovery of acquisition premium         $ 3.0          
ACC | GW-Santa Cruz Rate Case                    
Public Utilities, General Disclosures [Line Items]                    
Requested revenue increase 2.3                  
Plant held for future use $ 3.4