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Fair value measurement (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Categories of financial assets [abstract]        
Cash and cash equivalents R$ 1,794,362 R$ 1,640,065 R$ 1,403,955 R$ 2,763,050
Financial investments 782,647 979,837    
Accounts receivable 23,428,522 16,042,970    
Other receivables 194,776 164,805    
Judicial deposits 40,224 7,449    
Investment 1,406 1,400    
Categories of financial liabilities [abstract]        
Payables to third parties 13,217,150 10,101,510    
Trade payables 578,004 335,539    
Payables to related parties 543,621 58,336    
Deposits 3,133,996 766,086 R$ 0  
Borrowings 1,005,787 0    
Derivative financial instruments 14,317 0    
Deferred revenue 179,866 213,555    
Quoted prices in active markets (Level 1)        
Categories of financial assets [abstract]        
Cash and cash equivalents 446,322 321,674    
Financial investments 782,647 979,837    
Accounts receivable 0 0    
Other receivables 0 0    
Judicial deposits 0 0    
Investment 0 0    
Categories of financial liabilities [abstract]        
Payables to third parties 0 0    
Trade payables 0 0    
Payables to related parties 0 0    
Deposits 0 0    
Borrowings 0      
Derivative financial instruments 0      
Deferred revenue 0 0    
Other liabilities 0 0    
Significant observable inputs (Level 2)        
Categories of financial assets [abstract]        
Cash and cash equivalents 1,348,040 1,318,391    
Financial investments 0 0    
Accounts receivable 23,657,402 16,076,540    
Other receivables 206,486 164,805    
Judicial deposits 40,224 7,449    
Investment 0 0    
Categories of financial liabilities [abstract]        
Payables to third parties 13,217,150 10,101,510    
Trade payables 578,004 335,539    
Payables to related parties 543,621 58,336    
Deposits 3,133,996 766,086    
Borrowings 1,005,787      
Derivative financial instruments 14,317      
Deferred revenue 179,866 213,555    
Other liabilities 143,884 159,198    
Significant unobservable inputs (Level 3)        
Categories of financial assets [abstract]        
Cash and cash equivalents 0 0    
Financial investments 0 0    
Accounts receivable 0 0    
Other receivables 0 0    
Judicial deposits 0 0    
Investment 1,406 1,400    
Categories of financial liabilities [abstract]        
Payables to third parties 0 0    
Trade payables 0 0    
Payables to related parties 0 0    
Deposits 0 0    
Borrowings 0      
Derivative financial instruments 0      
Deferred revenue 0 0    
Other liabilities R$ 0 R$ 0