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12 Financial assets and financial liabilities (Details 6) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of redesignated financial assets and liabilities [line items]      
Opening balance R$ 300,237    
Interest 25,543 R$ 24,002 R$ 2,404
Closing balance 518,240 300,237  
Accounts Payable To Selling Shareholders [Member]      
Disclosure of redesignated financial assets and liabilities [line items]      
Opening balance 300,237 177,730
Cash flows (134,518) (92,688)  
Acquisition of IPEC   54,000  
Interest 13,884 17,977 1,687
Business combinations 343,140 144,538 176,043
Compensation of legal proceedings disbursement (4,503) (1,320)  
Closing balance R$ 518,240 R$ 300,237 R$ 177,730