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Intangible assets (Details 4) - BRL (R$)
R$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use R$ 592,267 R$ 492,739
Leases Related To Concession Agreements And Program Contract [Member] | Costs [Member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use 582,617 588,600
Leases Related To Concession Agreements And Program Contract [Member] | Accumulated Amortizations [Member]    
IfrsStatementLineItems [Line Items]    
Accumulated amortization (217,041) (213,921)
Leases Related To Concession Agreements And Program Net [Member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use 365,576 374,679
Vehicles [member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use 232,477 205,593
Properties [Member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use 58,505 11,566
Office equipment [member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use 45 45
Accumulated Amortization [Member]    
IfrsStatementLineItems [Line Items]    
Accumulated amortization (64,336) (99,144)
Right Of Use Assets Net [Member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use R$ 226,691 R$ 118,060