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Events after the reporting period (Details Narrative) - BRL (R$)
R$ in Thousands
Apr. 08, 2024
Jun. 03, 2024
Jun. 01, 2024
Apr. 17, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]                
Tariffs adustments 6.4469%              
Foreign currency of existing debts       R$ 534,000        
Net book value of Igarapava related assets     R$ 11,400   R$ 44,459,122 R$ 44,012,858 R$ 39,744,201 R$ 39,320,871
Regulator amount         57,200      
Payments to receive warrants         3,064,500      
Payments to receive warrants historical value         2,373,800      
Payments to receive warrants net         1,873,200      
Sao Paulo [Member]                
IfrsStatementLineItems [Line Items]                
Payments to receive warrants         R$ 3,064,500      
Sabesp Share Capital [Member]                
IfrsStatementLineItems [Line Items]                
Share capital percentage   18.00%            
Investor Share Capital [Member]                
IfrsStatementLineItems [Line Items]                
Share capital percentage   15.00%            
Conselho Diretor Do Programa Estadual [Member]                
IfrsStatementLineItems [Line Items]                
Share capital percentage   10.00%