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Regulatory Rate Filings (Details)
 1 Months Ended 3 Months Ended
Oct. 26, 2021
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Nov. 23, 2020
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Oct. 28, 2020
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Jun. 17, 2020
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Jan. 31, 2022
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Jun. 30, 2022
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Oct. 25, 2021
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Sep. 08, 2021
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Aug. 18, 2021
Aug. 11, 2021
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Jul. 28, 2021
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Jul. 27, 2021
Jun. 28, 2021
serviceConnection
Jun. 23, 2021
May 27, 2021
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May 03, 2021
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Mar. 16, 2021
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Mar. 10, 2021
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Mar. 03, 2021
Mar. 01, 2021
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Feb. 25, 2021
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Feb. 01, 2021
Jan. 29, 2021
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Jan. 15, 2021
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Jan. 04, 2021
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Dec. 01, 2020
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Nov. 16, 2020
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San Jose Water Company | General Rate Case No. 21-01-003                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Regulatory rate filings, requested rate increase, year one                                                 $ 51,585,000   $ 11,750,000
Regulatory rate filings, requested rate increase as percentage of total revenue at time of request, year one                                                 13.35%   3.04%
Regulatory rate filings, requested rate increase, year two                                                 $ 16,932,000    
Regulatory rate filings, proposed rate increase, percent of authorized revenue, year two                                                 3.88%    
Regulatory rate filings, requested rate increase, year three                                                 $ 19,195,000    
Regulatory rate filings, requested rate increase, percent of authorized revenue, year three                                                 4.24%    
Regulatory rate filings, balancing and memorandum account, requested recovery (refund)                                                 $ 18,499,000    
Regulatory rate filings, requested authorization for capital budget, amount                                                 $ 435,000,000    
San Jose Water Company | General Rate Case No. 21-05-004                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Regulatory rate filings, requested rate increase, year one                               $ 6,418,000                      
Regulatory rate filings, requested rate increase as percentage of total revenue at time of request, year one                               1.61%                      
Regulatory rate filings, rate of return, requested                               8.11%                      
Regulatory rate filings, rate of return, current                               7.64%                      
Regulatory rate filings, average cost of debt rate, requested                               6.20%                      
Regulatory rate filings, average cost of debt rate, current                               5.48%                      
Regulatory rate filings, return of equity rate, requested                               10.30%                      
Regulatory rate filings, return of equity rate, current                               8.90%                      
Regulatory rate filings, capital structure, debt percentage, current                               47.00%                      
Regulatory rate filings, capital structure, equity percentage, current                               53.00%                      
Regulatory rate filings, capital structure, debt percentage, requested                               45.00%                      
Regulatory rate filings, capital structure, equity percentage, requested                               55.00%                      
San Jose Water Company | Advice Letter No. 561/561A                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Regulatory rate filings, requested rate increase, year one                             $ 17,262,000                        
Regulatory rate filings, requested rate increase as percentage of total revenue at time of request, year one                             4.34%                        
Connecticut Water                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Public utilities, requested rate increase (decrease), amount     $ 956,000                                                
Requested WICA surcharge, percentage     6.94%                               7.03%                
WICA surcharge, percentage                     0.00%                                
Authorized WICA surcharge, percentage                       7.03%                              
Regulatory rate filings, requested increase in revenues                   $ 2,229,000                           $ 20,206,000      
Requested increase in revenues, completed infrastructure investments not currently in approved rates and surcharges                                               $ 265,514,000      
Regulatory rate filings, approved revenue increase                     $ 5,208,000                                
Regulatory rate filings, return of equity rate, approved                     9.00%                                
Regulatory rate filings, statutory cap reset value                     $ 0                                
Connecticut Water | Maximum                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Regulatory rate filings, requested authorization for debt issuance                                 $ 100,000,000                    
Connecticut Water | Forecast                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Public utilities, requested rate increase (decrease), amount         $ 2,581,000                                            
Requested WICA surcharge, percentage         2.49%                                            
Connecticut Water | Subsequent Event                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Public utilities, requested rate increase (decrease), amount $ 21,746,000                                                    
Regulatory rate filings, approved revenue increase             $ 1,752,000                                        
Connecticut Water | WICA                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Requested WICA surcharge increase (decrease), percentage     1.11%                                     0.09%          
Avon Water Company                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Authorized WICA surcharge, percentage                       8.51%                              
CLWSC                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Authorized regulatory surcharge, per thousand gallons                                       $ 0.70 $ 1.84   $ 0.95     $ 2.02  
Authorized regulatory surcharge, percent increase                 13.00%                                    
Authorized regulatory base charge, per residential account                                         $ 0.51            
Potential increase in number of service connections | serviceConnection                         1,400                            
Maine Water Company                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Regulatory rate filings, requested rate increase, year one               $ 6,880,000                   $ 6,659,000                  
Regulatory rate filings, requested rate increase as percentage of total revenue at time of request, year one               80.10%                   77.50%                  
Public utilities, requested rate increase (decrease), amount   $ 304,000                                                  
Approved rate increase (decrease)       $ 198,000                                              
Approved rate increase (decrease), step increase 1       9.80%                                              
Approved rate increase (decrease), step increase 2       3.51%                                              
Approved rate increase (decrease)       13.31%                                              
Authorized temporary surcharge, percentage                           22.65%                          
Authorized temporary surcharge, period effective                           1 year                          
Maine Water Company | Maximum                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Requested WISC surcharge increase (decrease), percentage   5.00%                                                  
Maine Water Company | Minimum                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Requested WISC surcharge increase (decrease), percentage   1.10%                                                  
Maine Water Company | Forecast                                                      
Public Utilities, General Disclosures [Line Items]                                                      
Regulatory rate filings, requested project replacement value           $ 60,000,000