v3.26.1
Events after the reporting period (Details Narrative) - BRL (R$)
R$ / shares in Units, R$ in Thousands
12 Months Ended
Jan. 27, 2026
Jan. 21, 2026
Jan. 27, 2026
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Mar. 13, 2026
Mar. 12, 2026
Mar. 11, 2026
Feb. 24, 2026
Feb. 10, 2026
Jan. 28, 2026
IfrsStatementLineItems [Line Items]                        
Financing       R$ 4,225,778 R$ 2,701,304 R$ 2,708,617            
Net revenue         R$ 62,720              
Non Adjusting Event [Member]                        
IfrsStatementLineItems [Line Items]                        
Acquisition of common shares equivalent 90.00% 74.90% 90.00%         100.00%       40.21%
Provision of public water and sewage services R$ 65                      
Debentures issued                     R$ 6,292,086  
Acquisition shares issued   11,009,550                    
Acquisition of common shares equivalent   29.79%                   66.80%
Acquired common share   R$ 62.00                    
Acquired consideration   R$ 59.33                    
Consideration acquired   R$ 682,643           R$ 171,638       R$ 476,461
Transaction acquisition   14,856,900                    
Acquired preferred share                       R$ 32.07
Acquisition total capital   70.10%                    
Securities issued                   R$ 144,000    
Common acquisition shares               3,407,000        
Acquisition common interest rate               23.17%        
Acquisition share capital interest rate               9.22%        
Acquired price per share             R$ 49.47   R$ 50.38      
Non Adjusting Event [Member] | Inter American Investment Corporation [Member]                        
IfrsStatementLineItems [Line Items]                        
Investment 1,500,000                      
Financing 150,000                      
Financing     R$ 1,350,000                  
Non Adjusting Event [Member] | Inter American Investment Corporation [Member] | Maturity 2031 [Member]                        
IfrsStatementLineItems [Line Items]                        
Principal amount R$ 850,000                      
Interest rate 5.75%   5.75%                  
Non Adjusting Event [Member] | Inter American Investment Corporation [Member] | Maturity 2036 [Member]                        
IfrsStatementLineItems [Line Items]                        
Principal amount     R$ 500,000                  
Interest rate 6500.00%   6500.00%