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The derivative financial instruments used to hedge the exposure to interest rates as of September 30, 2021 are presented in the table below: (Details)
R$ in Thousands
 9 Months Ended
Sep. 30, 2021
BRL (R$)
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]  
Fair value R$ (33,938)
Object R$ 96,966 [1]
Cash Flow Hedges Derivative Instruments [Member]  
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]  
Hedged object  Debenture - 2nd Issue - 1st series - IPCA + 5.30% p.a 
Maturity  3rd Qtr. 2027 
Assets IPCA + 5.30% p.a
Liabilities  CDI + 2.16% p.a. 
Notional R$ 705,000
Fair value (2,351)
Object R$ 27,316 [1]
Cash Flow Hedges Derivative Instruments 1 [Member]  
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]  
Hedged object  Debenture - 2nd Issue - 2nd series - IPCA + 5.60% p.a 
Maturity  3rd Qtr. 2030 
Assets IPCA + 5.60% p.a
Liabilities  CDI + 2.32% p.a. 
Notional R$ 1,495,000
Fair value (31,528)
Object R$ 71,026 [1]
Cash Flow Hedges Derivative Instruments 2 [Member]  
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]  
Hedged object  Debenture - 3rd Issue - single series - IPCA + 4.78% p.a 
Maturity  2nd Qtr. 2031 
Assets IPCA + 4.78% p.a
Liabilities  CDI + 0.60% p.a. 
Notional R$ 200,000
Fair value (59)
Object R$ (1,376) [1]
[1] Corresponds to the accumulated amount of fair value hedge adjustments on the hedged items, included in the carrying amount of the debentures.