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Schedule of operating income for each operating segment (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Apr. 08, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]        
Net revenue R$ 1,945 R$ 1,719,371 R$ 1,201,191 R$ 750,630
Cost of services   (652,300) (434,654) (308,853)
Gross profit   1,067,071 766,537 441,777
General and administrative expenses   (622,615) (402,855) (239,120)
Operating income   440,895 363,335 205,251
Finance income   64,566 62,290 51,689
Income before income taxes   273,462 335,054 186,937
Income taxes expenses   31,179 27,067 14,175
Net income   242,283 307,987 172,762
Operating segments [member]        
IfrsStatementLineItems [Line Items]        
External customer   1,719,371 1,201,191 750,630
Inter-segment      
Net revenue   1,719,371 1,201,191 750,630
Cost of services   (652,300) (434,654) (308,853)
Gross profit   1,067,071 766,537 441,777
General and administrative expenses   (622,615) (402,855) (239,120)
Other expenses, net   (3,561) (347) 2,594
Operating income   440,895 363,335 205,251
Finance income   64,566 62,290 51,689
Finance expenses   (243,796) (98,269) (72,365)
Share of income of associate   11,797 7,698 2,362
Income before income taxes   273,462 335,054 186,937
Income taxes expenses   (31,179) (27,067) (14,175)
Net income   242,283 307,987 172,762
Operating segments [member] | Undergrad [Member]        
IfrsStatementLineItems [Line Items]        
External customer   1,498,408 1,002,461 653,760
Inter-segment      
Net revenue   1,498,408 1,002,461 653,760
Cost of services   (554,995) (381,964) (279,066)
Gross profit   943,413 620,497 374,694
Other expenses, net      
Operating income      
Finance income      
Finance expenses      
Share of income of associate      
Income before income taxes      
Income taxes expenses      
Net income      
Operating segments [member] | Continuing Education [Member]        
IfrsStatementLineItems [Line Items]        
External customer   72,983 107,197 64,870
Inter-segment      
Net revenue   72,983 107,197 64,870
Cost of services   (50,773) (40,000) (29,261)
Gross profit   22,210 67,197 35,609
Other expenses, net      
Operating income      
Finance income      
Finance expenses      
Share of income of associate      
Income before income taxes      
Income taxes expenses      
Net income      
Operating segments [member] | Digital Services [Member]        
IfrsStatementLineItems [Line Items]        
External customer   147,980 91,533 32,000
Inter-segment   3,978 1,619 3,880
Net revenue   151,958 93,152 35,880
Cost of services   (50,510) (14,309) (4,406)
Gross profit   101,448 78,843 31,474
Other expenses, net      
Operating income      
Finance income      
Finance expenses      
Share of income of associate      
Income before income taxes      
Income taxes expenses      
Net income      
Operating segments [member] | Total Reportable Segments [Member]        
IfrsStatementLineItems [Line Items]        
External customer   1,719,371 1,201,191 750,630
Inter-segment   3,978 1,619 3,880
Net revenue   1,723,349 1,202,810 754,510
Cost of services   (656,278) (436,273) (312,733)
Gross profit   1,067,071 766,537 441,777
Other expenses, net      
Operating income      
Finance income      
Finance expenses      
Share of income of associate      
Income before income taxes      
Income taxes expenses      
Net income      
Operating segments [member] | Adjustments And Eliminations [Member]        
IfrsStatementLineItems [Line Items]        
External customer      
Inter-segment   (3,978) (1,619) (3,880)
Net revenue   (3,978) (1,619) (3,880)
Cost of services   3,978 R$ 1,619 R$ 3,880
Gross profit      
Other expenses, net      
Operating income      
Finance income      
Finance expenses      
Share of income of associate      
Income before income taxes      
Income taxes expenses      
Net income