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Significant accounting policies and new and not yet effective accounting standards (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]    
Maximum maturity period of cash and cash equivalents 3 months  
Period of lease term of short-term leases 12 months  
Share capital R$ 4,820,815 R$ 4,820,815
Share capital (in shares) 82,649,887  
Capital Reserve R$ 80,531 61,488
Acquisition of shares upon repurchase program   23,880
Minimum Period of contract for sale of textbooks and learning systems (in years) 3 years  
Maximum Period of contract for sale of textbooks and learning systems (in years) 5 years  
Sales return term from delivery date 4 months  
Tax effect of revenues exempt from taxation R$ 0  
Nominal statutory rate on service revenues (as a percent) 9.25%  
Municipal service tax, statutory rate (as a percent) 5.00%  
Treasury shares [member]    
Disclosure of classes of share capital [line items]    
Acquisition of shares upon repurchase program R$ 23,880 R$ 23,880
Number of shres acquired upon repurchase program 1,000,000 1,000,000
Cogna Group    
Disclosure of classes of share capital [line items]    
Share capital R$ 4,820,815  
Class B common shares | Cogna Group    
Disclosure of classes of share capital [line items]    
Share capital (in shares) 64,436,093  
Class A common shares    
Disclosure of classes of share capital [line items]    
Share capital (in shares) 18,213,794  
Class A common shares | Treasury shares [member]    
Disclosure of classes of share capital [line items]    
Acquisition of shares upon repurchase program   R$ 23,880
Number of shres acquired upon repurchase program   1,000,000