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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

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