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Capital management (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Capital management [Abstract]        
Borrowings R$ 1,005,787 R$ 0    
Cash and cash equivalents (1,794,362) (1,640,065) R$ (1,403,955) R$ (2,763,050)
Net debt (788,575)      
Total equity 10,502,198 R$ 9,327,459 R$ 8,014,948 R$ 6,574,376
Total capital R$ 9,713,623      
Gearing ratio (8.10%)