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Income taxes (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes      
Income before income taxes R$ 429,582 R$ 428,433 R$ 273,462
Combined statutory income taxes rate - % 34.00% 34.00% 34.00%
Income taxes at statutory rates R$ (146,058) R$ (145,667) R$ (92,977)
Reconciliation adjustments:      
Tax effect on loss from entities not subject to taxation (32,274) (32,859) (37,794)
PROUNI - Fiscal Incentive (i) 309,952 270,062 194,830
Unrecognized deferred tax assets (154,062) (117,377) (86,233)
Recognized deferred tax assets 3,233
Presumed profit income tax regime effect (ii) (8,787) (1,549) (7,066)
Permanent adjustments (4,687) (12,226) (6,232)
Other 8,517 3,939 4,293
Income taxes expense - current R$ (24,166) R$ (35,677) R$ (31,179)
Effective rate 5.62% 8.33% 11.40%