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22 Insurance contracts and contingencies (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of types of insurance contracts [line items]      
Balance as of beginning of the year R$ 5,269 R$ 3,465 R$ 1,720
Business combinations 32,576 4,372 2,089
Additions 19,284 [1] 2,245 13
Reversals (3,990) (4,813) (357)
Balances as of end of the year 53,139 5,269 3,465
Legal proceedings and contingencies [member] | Labour [member]      
Disclosure of types of insurance contracts [line items]      
Balance as of beginning of the year 2,501 2,233 297
Business combinations 2,348 3,301 2,089
Additions 10,869 [1] 737 13
Reversals (2,705) (3,770) (166)
Balances as of end of the year 13,280 2,501 2,233
Legal proceedings and contingencies [member] | Civil [member]      
Disclosure of types of insurance contracts [line items]      
Balance as of beginning of the year 2,768 1,232 1,423
Business combinations 2,741 1,071
Additions 562 [1] 1,508
Reversals (1,285) (1,043) (191)
Balances as of end of the year 4,519 2,768 1,232
Legal proceedings and contingencies [member] | Taxes [member]      
Disclosure of types of insurance contracts [line items]      
Balance as of beginning of the year
Business combinations 27,487  
Additions 7,853 [1]
Balances as of end of the year R$ 35,340
[1] The total amount of R$ 9,940 are related to legal proceedings attributed to the selling shareholders administration. The same amount was recorded as indemnification assets in the balance sheet in other assets.