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Schedule of deferred income and social contribution taxes (Details) - BRL (R$)
R$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Tax losses carryforward R$ 2,065,129 R$ 2,060,846  
Adjustments for current tax of prior periods 773,829 772,283  
Deferred tax expense (income) relating to origination and reversal of temporary differences 4,639,101 4,120,642  
Temporary differences - Liabilities Total (2,168,578) (2,038,105)  
Deferred tax expense income relating to origination and reversal of temporary differences liabilities 2,168,578 2,038,105  
Deferred tax liability (asset) 2,470,523 2,082,537 R$ 1,830,060
Deferred tax assets 2,505,005 2,109,064  
Deferred tax liabilities (34,482) (26,527)  
Provisions For Tax Civi Land Labor Risks [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Deferred tax expense (income) relating to origination and reversal of temporary differences 479,238 458,019  
Suspended Collection Taxes [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Deferred tax expense (income) relating to origination and reversal of temporary differences 2,754 1,871  
Expected Credit Losses [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Deferred tax expense (income) relating to origination and reversal of temporary differences 180,735 194,977  
Impairment On Tax Credits [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Deferred tax expense (income) relating to origination and reversal of temporary differences 56,136 67,900  
Provision For Other Obligations [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Deferred tax expense (income) relating to origination and reversal of temporary differences 106,406 115,959  
Employees Profit Sharing [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Deferred tax expense (income) relating to origination and reversal of temporary differences 24,646 86,752  
Write Down To Net Realizable Value Of Inventories [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Deferred tax expense (income) relating to origination and reversal of temporary differences 17,461 19,189  
Employees Benefits Plan [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Deferred tax expense (income) relating to origination and reversal of temporary differences 242,815 216,510  
Lease Basis Difference [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Deferred tax expense (income) relating to origination and reversal of temporary differences 111,216 86,308  
Adjustment to the expcted annual rate [member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Deferred tax expense (income) relating to origination and reversal of temporary differences 557,112 (0)  
Other temporary differences [member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Deferred tax expense (income) relating to origination and reversal of temporary differences 21,624 40,028  
Temporary differences - Liabilities Total 44,800 22,749  
Deferred tax expense income relating to origination and reversal of temporary differences liabilities (44,800) (22,749)  
Difference on tax accounting basis for goodwill amortization [member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Temporary differences - Liabilities Total (292,732) (320,729)  
Deferred tax expense income relating to origination and reversal of temporary differences liabilities 292,732 320,729  
Difference Between Tax Depreciation Rate And Accounting Depreciation Rate Usefullife [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Temporary differences - Liabilities Total (871,534) (851,436)  
Deferred tax expense income relating to origination and reversal of temporary differences liabilities 871,534 851,436  
Business Combination [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Temporary differences - Liabilities Total (909,127) (761,429)  
Deferred tax expense income relating to origination and reversal of temporary differences liabilities 909,127 761,429  
Unrealized Gains On Derivatives Net [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Temporary differences - Liabilities Total (18,045) (42,493)  
Deferred tax expense income relating to origination and reversal of temporary differences liabilities 18,045 42,493  
Unrealized Fair Value Gains Net [Member]      
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]      
Temporary differences - Liabilities Total (32,340) (39,269)  
Deferred tax expense income relating to origination and reversal of temporary differences liabilities R$ 32,340 R$ 39,269