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Segment information (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Net revenue R$ 2,875,913 R$ 2,329,057 R$ 1,719,371
Gross profit 1,766,100 1,469,505 1,067,071
Operating income 767,061 664,100 440,895
Finance income 110,642 102,042 64,566
Income before income taxes 429,582 428,433 273,462
Income taxes expenses 24,166 35,677 31,179
Net income 405,416 392,756 242,283
Operating segments [member]      
IfrsStatementLineItems [Line Items]      
External customer 2,875,913 2,329,057 1,719,371
Inter-segment
Net revenue 2,875,913 2,329,057 1,719,371
Cost of services (1,109,813) (859,552) (652,300)
Gross profit 1,766,100 1,469,505 1,067,071
Selling, general and administrative expenses (1,014,684) (798,153) (622,615)
Other expenses, net 15,645 (7,252) (3,561)
Operating income 767,061 664,100 440,895
Finance income 110,642 102,042 64,566
Finance expenses (457,616) (349,893) (243,796)
Share of income of associate 9,495 12,184 11,797
Income before income taxes 429,582 428,433 273,462
Income taxes expenses (24,166) (35,677) (31,179)
Net income 405,416 392,756 242,283
Operating segments [member] | Undergrad [member]      
IfrsStatementLineItems [Line Items]      
External customer 2,511,018 2,037,889 1,498,408
Inter-segment
Net revenue 2,511,018 2,037,889 1,498,408
Cost of services (997,973) (763,185) (554,995)
Gross profit 1,513,045 1,274,704 943,413
Operating segments [member] | Continuing Education [member]      
IfrsStatementLineItems [Line Items]      
External customer 146,827 108,806 72,983
Inter-segment
Net revenue 146,827 108,806 72,983
Cost of services (62,792) (56,554) (50,773)
Gross profit 84,035 52,252 22,210
Operating segments [member] | Digital Services [member]      
IfrsStatementLineItems [Line Items]      
External customer 218,068 182,362 147,980
Inter-segment 11,217 7,622 3,978
Net revenue 229,285 189,984 151,958
Cost of services (60,265) (47,435) (50,510)
Gross profit 169,020 142,549 101,448
Operating segments [member] | Total Reportable Segments [Member]      
IfrsStatementLineItems [Line Items]      
External customer 2,875,913 2,329,057 1,719,371
Inter-segment 11,217 7,622 3,978
Net revenue 2,887,130 2,336,679 1,723,349
Cost of services (1,121,030) (867,174) (656,278)
Gross profit 1,766,100 1,469,505 1,067,071
Operating segments [member] | Adjustments And Eliminations [Member]      
IfrsStatementLineItems [Line Items]      
External customer
Inter-segment (11,217) (7,622) (3,978)
Net revenue (11,217) (7,622) (3,978)
Cost of services 11,217 7,622 3,978
Gross profit