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13 Fair value measurement (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]      
Trade receivable (non-current) R$ 7,627 R$ 9,801  
Restricted Cash 2,053 16,841  
Loans and financing 617,485 60,357  
Lease liabilities (447,703) (284,515) R$ (212,360)
Accounts payable to selling shareholders (518,240) (300,237)  
Notes payable 76,181    
At Fair Value [member]      
Disclosure of fair value measurement of assets [line items]      
Derivative financial liabilities, Cross-currency interest rate swaps   (757)  
For Which Fair Value Is Disclosed [Member]      
Disclosure of fair value measurement of assets [line items]      
Trade receivable (non-current) 7,627 9,801  
Restricted Cash 2,053 16,841  
Loans and financing (637,723) (60,443)  
Lease liabilities (447,703) (284,515)  
Accounts payable to selling shareholders (518,240) (300,237)  
Notes payable (76,181)    
Level 1 Of Fair Value Hierarchy [member] | At Fair Value [member]      
Disclosure of fair value measurement of assets [line items]      
Derivative financial liabilities, Cross-currency interest rate swaps    
Level 1 Of Fair Value Hierarchy [member] | For Which Fair Value Is Disclosed [Member]      
Disclosure of fair value measurement of assets [line items]      
Trade receivable (non-current)    
Restricted Cash  
Loans and financing  
Lease liabilities  
Accounts payable to selling shareholders    
Notes payable    
Level 2 Of Fair Value Hierarchy [member] | At Fair Value [member]      
Disclosure of fair value measurement of assets [line items]      
Derivative financial liabilities, Cross-currency interest rate swaps   (757)  
Level 2 Of Fair Value Hierarchy [member] | For Which Fair Value Is Disclosed [Member]      
Disclosure of fair value measurement of assets [line items]      
Trade receivable (non-current) 7,627 9,801  
Restricted Cash 2,053 16,841  
Loans and financing (637,723) (60,443)  
Lease liabilities (447,703) (284,515)  
Accounts payable to selling shareholders (518,240) (300,237)  
Notes payable (76,181)    
Level 3 Of Fair Value Hierarchy [Member] | At Fair Value [member]      
Disclosure of fair value measurement of assets [line items]      
Derivative financial liabilities, Cross-currency interest rate swaps    
Level 3 Of Fair Value Hierarchy [Member] | For Which Fair Value Is Disclosed [Member]      
Disclosure of fair value measurement of assets [line items]      
Trade receivable (non-current)    
Restricted Cash  
Loans and financing  
Lease liabilities  
Accounts payable to selling shareholders    
Notes payable