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Investments (Details) - BRL (R$) R$ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 30,680,671 | R$ 28,080,745 | R$ 29,857,376 | R$ 27,333,533
Profit for the year | 823,295 | 747,212 |  |
Investments | 139,412 |  | 130,520 |
Equity in the earnings of subsidiaries | 9,009 |  |  |
Other investments | 6,099 |  | 6,099 |
Overall total | 170,529 |  | 161,863 |
Seasamm [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | 65,511 |  | 61,275 |
Contribution |  |  |  |
Profit for the year | 4,236 | 4,630 |  |
Investments | 23,584 |  | R$ 22,059 |
Equity in the earnings of subsidiaries | R$ 1,525 |  |  |
Interest percentage | 36.00% |  | 36.00% |
Aguas De Andradinas [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 35,582 |  | R$ 34,088 |
Contribution |  |  |  |
Profit for the year | 1,494 | 389 |  |
Investments | 10,673 |  | R$ 10,225 |
Equity in the earnings of subsidiaries | R$ 448 |  |  |
Interest percentage | 30.00% |  | 30.00% |
Aguas De Castilho [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 13,384 |  | R$ 12,784 |
Contribution |  |  |  |
Profit for the year | 600 | 402 |  |
Investments | 4,015 |  | R$ 3,835 |
Equity in the earnings of subsidiaries | R$ 180 |  |  |
Interest percentage | 30.00% |  | 30.00% |
Attend Ambiental [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 47,823 |  | R$ 43,263 |
Contribution |  |  |  |
Profit for the year | 4,560 | 4,016 |  |
Investments | 21,521 |  | R$ 19,469 |
Equity in the earnings of subsidiaries | R$ 2,052 |  |  |
Interest percentage | 45.00% |  | 45.00% |
Aquapolo Ambiental [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 112,297 |  | R$ 102,442 |
Contribution |  |  |  |
Profit for the year | 9,855 | 8,610 |  |
Investments | 55,025 |  | R$ 50,196 |
Equity in the earnings of subsidiaries | R$ 4,829 |  |  |
Interest percentage | 49.00% |  | 49.00% |
Paulista Geradora De Energia [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 42,917 |  | R$ 42,307 |
Contribution | 590 |  |  |
Profit for the year | 20 | (28) |  |
Cantareira S P Energia [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | 10,711 |  | 10,650 |
Contribution |  |  |  |
Profit for the year | 61 | (258) |  |
Investments | 5,242 |  | R$ 5,212 |
Equity in the earnings of subsidiaries | R$ 30 |  |  |
Interest percentage | 49.00% |  | 49.00% |
F O X X U R E B A Ambiental [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 62,430 |  | R$ 63,309 |
Contribution |  |  |  |
Profit for the year | (295) | (6,549) |  |
Investments | 12,486 |  | R$ 12,663 |
Equity in the earnings of subsidiaries | R$ (60) |  |  |
Interest percentage | 20.00% |  | 20.00% |
Other investments | R$ 25,018 |  | R$ 25,244 |
Infranext Solucoesem Pavimentacao [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | 4,699 |  | 4,699 |
Contribution |  |  |  |
Profit for the year |  | (340) |  |
Investments |  |  |  |
Equity in the earnings of subsidiaries |  |  |  |
Interest percentage | 45.00% |  | 45.00% |
Sabesp Olimpia [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ (3,121) |  | R$ (3,066) |
Contribution |  |  |  |
Profit for the year | (55) |  |  |
Paulista Geradora De Energia 1 [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Investments | 6,866 |  | R$ 6,861 |
Equity in the earnings of subsidiaries | R$ 5 |  |  |
Interest percentage | 25.00% |  | 25.00% |

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