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8. BIOLOGICAL ASSETS (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current biological assets [Member]    
Disclosure of detailed information about biological assets [line items]    
Beginning balance R$ 1,603,039 R$ 1,513,133
Additions/Transfer 16,814,078 7,002,415
Changes in fair value 2,427,416 1,773,891
Harvest
Write-off
Transfer between currentand non-current 148,738 126,405
Transfer to assets held for sale
Transfer to inventories (18,865,818) (8,808,624)
Exchange variation 1,557 (4,181)
Ending balance 2,129,010 1,603,039
Current biological assets [Member] | Live Animals [Member] | Poultry [member]    
Disclosure of detailed information about biological assets [line items]    
Beginning balance 615,685 582,853
Additions/Transfer 9,705,994 3,456,921
Changes in fair value 2,059,397 1,564,807
Harvest
Write-off
Transfer between currentand non-current 57,164 49,250
Transfer to assets held for sale
Transfer to inventories (11,571,369) (5,033,965)
Exchange variation 1,557 (4,181)
Ending balance 868,428 615,685
Current biological assets [Member] | Live Animals [Member] | Pork [Member]    
Disclosure of detailed information about biological assets [line items]    
Beginning balance 987,354 930,280
Additions/Transfer 7,108,084 3,545,494
Changes in fair value 368,019 209,084
Harvest
Write-off
Transfer between currentand non-current 91,574 77,155
Transfer to assets held for sale
Transfer to inventories (7,294,449) (3,774,659)
Exchange variation
Ending balance 1,260,582 987,354
Non-current biological assets [Member]    
Disclosure of detailed information about biological assets [line items]    
Beginning balance 1,081,025 1,061,314
Additions/Transfer 473,057 422,866
Changes in fair value (110,634) (209,538)
Harvest (59,586) (48,890)
Write-off (5,099) (11,810)
Transfer between currentand non-current (148,738) (126,405)
Transfer to assets held for sale (10,060) (1,655)
Transfer to inventories
Exchange variation 1,784 (4,857)
Ending balance 1,221,749 1,081,025
Non-current biological assets [Member] | Live Animals [Member] | Poultry [member]    
Disclosure of detailed information about biological assets [line items]    
Beginning balance 414,668 381,236
Additions/Transfer 71,494 94,055
Changes in fair value 51,660 (6,516)
Harvest  
Write-off  
Transfer between currentand non-current (57,164) (49,250)
Transfer to assets held for sale (10,389)  
Transfer to inventories  
Exchange variation 1,784 (4,857)
Ending balance 472,053 414,668
Non-current biological assets [Member] | Live Animals [Member] | Pork [Member]    
Disclosure of detailed information about biological assets [line items]    
Beginning balance 337,804 317,185
Additions/Transfer 363,027 272,677
Changes in fair value (184,005) (174,903)
Harvest
Write-off
Transfer between currentand non-current (91,574) (77,155)
Transfer to assets held for sale
Transfer to inventories
Exchange variation
Ending balance 425,252 337,804
Non-current biological assets [Member] | Forests [Member]    
Disclosure of detailed information about biological assets [line items]    
Beginning balance 328,553 362,893
Additions/Transfer 38,536 56,134
Changes in fair value 21,711 (28,119)
Harvest (59,586) (48,890)
Write-off (5,099) (11,810)
Transfer between currentand non-current
Transfer to assets held for sale 329 (1,655)
Transfer to inventories
Exchange variation
Ending balance R$ 324,444 R$ 328,553