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24. SEGMENT INFORMATION (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Total R$ 3,051,229 R$ 2,748,337 R$ (206,334)
Corporate [member]      
Disclosure of operating segments [line items]      
Total (327,366) (454,899) (909,839)
Corporate [member] | Investigations involving the company [member]      
Disclosure of operating segments [line items]      
Total (28,004) (79,208) (492,795)
Corporate [member] | Agreement - class action [member]      
Disclosure of operating segments [line items]      
Total (204,436)
Corporate [member] | Tax and civil contingencies [member]      
Disclosure of operating segments [line items]      
Total (109,088) (63,228) (2,530)
Corporate [member] | Expenses COVID-19 [member]      
Disclosure of operating segments [line items]      
Total [1] (81,562)
Corporate [member] | Results with disposal of businesses [Member]      
Disclosure of operating segments [line items]      
Total (29,471) 3,234 (56,950)
Corporate [member] | Results with sale and disposal of fixed assets [Member]      
Disclosure of operating segments [line items]      
Total (28,178) (14,642) 28,485
Corporate [member] | Expenses with demobilization [Member]      
Disclosure of operating segments [line items]      
Total (16,494) (39,281) (36,543)
Corporate [member] | Effects of the truck drivers' strike [member]      
Disclosure of operating segments [line items]      
Total (85,057)
Corporate [member] | Impairment of investments [Member]      
Disclosure of operating segments [line items]      
Total (62,006) (21,751) (56,497)
Corporate [member] | Restructuring plan [Member]      
Disclosure of operating segments [line items]      
Total (58) (14,460) (206,095)
Corporate [member] | Other [Member]      
Disclosure of operating segments [line items]      
Total [2] R$ 27,495 R$ (21,127) R$ (1,857)
[1] Mainly comprised of donations in Brazil, consultants and expenses with health and safety, which are not associated with the business segments.
[2] For the year ended on December 31, 2019, it includes the expense of R$19,045 in favor of the Municipality of Lucas do Rio Verde, arising from the housing incentive program for employees.