v3.26.1
Operating segment information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]      
Gross operating revenue R$ 39,908,684 R$ 38,876,857 R$ 27,113,774
Gross sales deductions (1,816,634) (2,731,380) (1,541,718)
Net operating revenue 38,092,050 36,145,477 25,572,056
Costs, selling, general and administrative expenses (25,815,313) (20,389,889) (19,286,394)
Income from operations before other operating expenses, net and equity accounting 12,276,737 15,755,588 6,285,662
Other operating income/(expenses), net 274,731 (280,450) 27,925
Equity accounting 48,153 35,322 32,393
Financial result, net (897,770) (1,867,652) (1,591,996)
Income from operations before taxes 11,701,851 13,642,808 4,753,984
Depreciation and amortization (2,208,762) (2,676,642) 2,790,586
Depreciation and amortization 2,208,762 2,676,642 (2,790,586)
Sanitations [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenue 25,471,321 32,650,986 21,513,442
Gross sales deductions (1,816,634) (2,731,380) (1,541,718)
Net operating revenue 23,654,687 29,919,606 19,971,724
Costs, selling, general and administrative expenses (11,377,950) (14,303,994) (13,811,665)
Income from operations before other operating expenses, net and equity accounting 12,276,737 15,615,612 6,160,059
Depreciation and amortization (2,208,762) (2,676,642) 2,790,586
Depreciation and amortization 2,208,762 2,676,642 (2,790,586)
Reconciliations [Member]      
IfrsStatementLineItems [Line Items]      
Gross operating revenue 14,437,363 6,225,871 5,600,332
Gross sales deductions
Net operating revenue 14,437,363 6,225,871 5,600,332
Costs, selling, general and administrative expenses (14,437,363) (6,085,895) (5,474,729)
Income from operations before other operating expenses, net and equity accounting R$ 139,976 R$ 125,603