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Material accounting policies, new accounting standards and new and not yet effective accounting standards (Details 3)
R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
BRL (R$)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
BRL (R$)
shares
Dec. 31, 2021
BRL (R$)
shares
Disclosure of classes of share capital [line items]        
Maximum maturity period of cash and cash equivalents 3 months 3 months    
Period of lease term of short-term leases 12 months 12 months    
Share capital | R$ R$ 4,820,815   R$ 4,820,815  
Share capital (in shares) 81,002,235      
Capital Reserve | R$ R$ 89,627   80,531  
Acquisition of shares upon repurchase program | R$ R$ 39,931   23,880 R$ 23,880
Number of shres acquired upon repurchase program 2,647,652 2,647,652    
Minimum Period of contract for sale of textbooks and learning systems (in years) 3 years 3 years    
Maximum Period of contract for sale of textbooks and learning systems (in years) 5 years 5 years    
Sales Return Term from Delivery Date 4 months 4 months    
Tax effect of revenues exempt from taxation | R$ R$ 0      
Nominal statutory rate on service revenues (as a percent) 9.25% 9.25%    
Municipal service tax, statutory rate (as a percent) 5.00% 5.00%    
Treasury shares | R$ R$ 59,525   23,880  
Treasury shares [member]        
Disclosure of classes of share capital [line items]        
Share capital (in shares) 1,888,376      
Acquisition of shares upon repurchase program R$ 39,931 $ 8,036 R$ 23,880 23,880
Number of shres acquired upon repurchase program 2,647,652 2,647,652 1,000,000  
Treasury shares | R$ R$ 59,525      
Cogna Group        
Disclosure of classes of share capital [line items]        
Share capital | R$ 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) 16,566,142      
Class A common shares | Treasury shares [member]        
Disclosure of classes of share capital [line items]        
Share capital (in shares) 1,888,376      
Acquisition of shares upon repurchase program R$ 39,931 $ 8,036 R$ 23,880 R$ 23,880
Number of shres acquired upon repurchase program     1,000,000 1,000,000