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Schedule of quantitative sensitivity analysis regarding relevant assumptions of defined benefit plan (Details) - BRL (R$)
R$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Recognised liabilities defined benefit plan R$ 822,174 R$ 776,555
Current 125,312 125,230
Non-current 696,862 651,325
Medical Plan [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Recognised liabilities defined benefit plan 196,283 185,802
F G T S Penalty [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Recognised liabilities defined benefit plan [1] 294,012 282,229
Award For Length Of Service [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Recognised liabilities defined benefit plan 113,900 108,908
Others [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Recognised liabilities defined benefit plan R$ 217,979 R$ 199,616
[1] FGTS – Government Severance Indemnity Fund for Employees