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4 Segment information (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]        
Total assets R$ 4,793,093 R$ 2,912,453    
Current assets 1,405,501 1,111,765    
Non-current assets 3,387,592 1,800,688    
Total liabilities and equity 4,793,093 2,912,453    
Current liabilities 589,379 333,229    
Non-current liabilities 1,369,934 465,498    
Equity 2,833,780 2,113,726 R$ 590,354 R$ 46,762
Investments in associate 51,410 45,634    
Capital expenditures 109,481 [1] 175,709 [2]    
Operating segments [member] | Business unit one [member]        
Disclosure of operating segments [line items]        
Total assets 4,541,988 2,714,161    
Current assets 1,280,342 1,026,857    
Non-current assets 3,261,646 1,687,304    
Total liabilities and equity 4,541,988 2,714,161    
Current liabilities 522,522 312,303    
Non-current liabilities 1,261,894 360,005    
Equity 2,757,572 2,041,853    
Investments in associate 51,410 45,634    
Capital expenditures 82,916 [1] 167,427 [2]    
Operating segments [member] | Business unit two [member]        
Disclosure of operating segments [line items]        
Total assets 251,220 199,285    
Current assets 125,274 85,901    
Non-current assets 125,946 113,384    
Total liabilities and equity 251,220 199,285    
Current liabilities 66,972 21,919    
Non-current liabilities 108,040 105,493    
Equity 76,208 71,873    
Investments in associate    
Capital expenditures 26,565 [1] 8,282 [2]    
Operating segments [member] | Total reportable segments [member]        
Disclosure of operating segments [line items]        
Total assets 4,793,208 2,913,446    
Current assets 1,405,616 1,112,758    
Non-current assets 3,387,592 1,800,688    
Total liabilities and equity 4,793,208 2,913,446    
Current liabilities 589,494 334,222    
Non-current liabilities 1,369,934 465,498    
Equity 2,833,780 2,113,726    
Investments in associate 51,410 45,634    
Capital expenditures 109,481 [1] 175,709 [2]    
Elimination inter-segment transactions [member]        
Disclosure of operating segments [line items]        
Total assets (115) (993)    
Current assets (115) (993)    
Non-current assets    
Total liabilities and equity (115) (993)    
Current liabilities (115) (993)    
Non-current liabilities    
Equity    
Investments in associate    
Capital expenditures [1] [2]    
[1] Capital expenditures consider the acquisitions of property and equipment and intangible assets.
[2] Capital expenditures consider the acquisitions of property and equipment and intangible assets, including the acquisition of IPEC licenses in the amount of R$ 108,000 (R$ 54,000 paid and included in the acquisition of intangible assets in the cash flows used in investing activities) as described in Note 11.