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Intangible assets - Changes in intangible assets (Details) - BRL (R$)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Changes in intangible assets    
Balance at the beginning R$ 224,516,000 R$ 79,248,000
Addition 303,630,000 197,891,000
Write-offs (47,898,000) (13,463,000)
Business combination 1,300,000 8,000
Amortization or Impairment (51,044,000) (39,168,000)
Balance at the end R$ 430,504,000 224,516,000
Number of projects that had significant additions 3  
License of Use Software    
Changes in intangible assets    
Balance at the beginning R$ 29,489,000 8,158,000
Addition 99,483,000 55,159,000
Write-offs (40,435,000) (1,561,000)
Transfer (3,350,000)  
Business combination   8,000
Amortization or Impairment (38,037,000) (32,275,000)
Balance at the end 47,150,000 29,489,000
Development costs    
Changes in intangible assets    
Balance at the beginning 69,144,000  
Addition 3,903,000  
Transfer 51,638,000 74,407,000
Amortization or Impairment (9,268,000) (5,263,000)
Balance at the end 115,417,000 69,144,000
Customer portfolio    
Changes in intangible assets    
Balance at the beginning 7,710,000  
Addition 1,631,000 9,340,000
Amortization or Impairment (3,739,000) (1,630,000)
Balance at the end 5,602,000 7,710,000
Goodwill    
Changes in intangible assets    
Balance at the beginning 38,964,000  
Addition 51,737,000 38,964,000
Business combination 1,000  
Balance at the end 90,702,000 38,964,000
Intangible in progress    
Changes in intangible assets    
Balance at the beginning 79,209,000 71,090,000
Addition 146,876,000 94,428,000
Write-offs (7,463,000) (11,902,000)
Transfer (48,288,000) (74,407,000)
Business combination 1,299,000  
Balance at the end R$ 171,633,000 R$ 79,209,000