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Operations (Details) - Sao Paulo [Member]
R$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
BRL (R$)
Municipalities
Mar. 31, 2023
BRL (R$)
Municipalities
Dec. 31, 2023
BRL (R$)
Municipalities
IfrsStatementLineItems [Line Items]      
Municipalities that have already signed contracts: | Municipalities 351 351 351
   Balance – intangible and contract assets R$ 49,485,788 R$ 45,931,674 R$ 48,759,219
   Percentage of intangible and contract assets 95.10% 94.79% 95.12%
Revenue from sanitation services (excluding construction revenue) R$ 5,384,173 R$ 4,678,421 R$ 20,510,427
Percentage of revenue from sanitation services (excluding construction revenue) 95.11% 95.30% 95.35%
Other Municipalities - Olimpia | Municipalities 1 1
Balance – intangible and contract assets R$ 146,715 R$ 147,589
Percentage of intangible and contract assets 0.28% 0.29%
Revenue from sanitation services (excluding construction revenue) R$ 8,525 R$ 3,477
Percentage of revenue from sanitation services (excluding construction revenue) 0.15% 0.02%
Municipalities with expired contracts: | Municipalities 1 1 1
   Balance – intangible and contract assets R$ 11,429 R$ 11,443 R$ 11,309
   Percentage of intangible and contract assets 0.02% 0.02% 0.02%
Revenue from sanitation services (excluding construction revenue) R$ 4,361 R$ 3,822 R$ 17,559
Percentage of revenue from sanitation services (excluding construction revenue) 0.08% 0.08% 0.08%
Municipalities with concession agreements due by 2030: | Municipalities 23 23 23
   Balance – intangible and contract assets R$ 1,045,481 R$ 1,064,090 R$ 1,051,209
   Percentage of intangible and contract assets 2.02% 2.20% 2.05%
Revenue from sanitation services (excluding construction revenue) R$ 223,943 R$ 189,704 R$ 833,418
Percentage of revenue from sanitation services (excluding construction revenue) 3.96% 3.86% 3.87%
Municipality of São Paulo:      
Percentage of intangible and contract assets 43.08% 43.21% 43.40%
Percentage of revenue from sanitation services (excluding construction revenue) 43.49% 44.53% 44.95%