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INTANGIBLE - Changes in intangible assets with determined useful life (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Intangible assets with determined useful life    
Balance at the beginning of the year R$ 180,311 R$ 141,785
Additions 17,715 7,983
Amortization (74,332) (44,340)
Exchange rate variation 2,930 12,461
Transfers and others 26,263 8,945
Balance at the end of the year 9,649,789 180,311
Trademarks and patents    
Intangible assets with determined useful life    
Balance at the beginning of the year 19,477  
Balance at the end of the year R$ 20,649 19,477
Trademarks and patents | Minimum    
Intangible assets with determined useful life    
Average Annual Amortization Rate 5.00%  
Trademarks and patents | Maximum    
Intangible assets with determined useful life    
Average Annual Amortization Rate 10.00%  
Software    
Intangible assets with determined useful life    
Average Annual Amortization Rate 20.00%  
Balance at the beginning of the year R$ 59,112  
Balance at the end of the year 119,265 59,112
Customer portfolio    
Intangible assets with determined useful life    
Balance at the beginning of the year 19,004  
Balance at the end of the year R$ 7,393 19,004
Customer portfolio | Minimum    
Intangible assets with determined useful life    
Average Annual Amortization Rate 2.50%  
Customer portfolio | Maximum    
Intangible assets with determined useful life    
Average Annual Amortization Rate 5.00%  
Non-compete agreement    
Intangible assets with determined useful life    
Average Annual Amortization Rate 5.00%  
Balance at the beginning of the year R$ 2,812  
Balance at the end of the year R$ 2,150 2,812
Research and development agreement    
Intangible assets with determined useful life    
Average Annual Amortization Rate 19.00%  
Balance at the beginning of the year R$ 79,906  
Balance at the end of the year R$ 74,643 79,906
Development and implementation of systems    
Intangible assets with determined useful life    
Average Annual Amortization Rate 20.00%  
Balance at the end of the year R$ 1,687  
Right of exploitation - Terminal concession    
Intangible assets with determined useful life    
Average Annual Amortization Rate 4.00%  
Balance at the end of the year R$ 166,932  
Supplier Relationship - Chemicals    
Intangible assets with determined useful life    
Average Annual Amortization Rate 5.00%  
Balance at the end of the year R$ 51,562  
Other    
Intangible assets with determined useful life    
Balance at the end of the year 1,857  
Fibria    
Intangible assets with determined useful life    
Business combination 308,681  
Balance at the end of the year R$ 9,202,973  
Fibria | Software    
Intangible assets with determined useful life    
Average Annual Amortization Rate 20.00%  
Balance at the end of the year R$ 16,402  
Fibria | Customer portfolio    
Intangible assets with determined useful life    
Average Annual Amortization Rate 9.00%  
Balance at the end of the year R$ 8,209,799  
Fibria | Customer portfolio | Minimum    
Intangible assets with determined useful life    
Average Annual Amortization Rate 13.00%  
Fibria | Customer portfolio | Maximum    
Intangible assets with determined useful life    
Average Annual Amortization Rate 100.00%  
Fibria | Supplier agreements    
Intangible assets with determined useful life    
Balance at the end of the year R$ 99,997  
Fibria | Port services agreements    
Intangible assets with determined useful life    
Average Annual Amortization Rate 4.00%  
Balance at the end of the year R$ 665,228  
Fibria | Port concession    
Intangible assets with determined useful life    
Average Annual Amortization Rate 4.00%  
Balance at the end of the year R$ 52,324  
Fibria | Lease agreements    
Intangible assets with determined useful life    
Average Annual Amortization Rate 17.00%  
Balance at the end of the year R$ 36,871  
Fibria | Cultivars    
Intangible assets with determined useful life    
Average Annual Amortization Rate 14.00%  
Balance at the end of the year R$ 122,352  
Facepa    
Intangible assets with determined useful life    
Fair value adjustment on business combination   R$ 53,477
Ibema    
Intangible assets with determined useful life    
Fair value adjustment on business combination 702  
Balance at the end of the year 678  
Gross | Fibria    
Intangible assets with determined useful life    
Fair value adjustment on business combination 10,159,550  
Gross | Fibria | Software    
Intangible assets with determined useful life    
Fair value adjustment on business combination 20,502  
Gross | Fibria | Customer portfolio    
Intangible assets with determined useful life    
Fair value adjustment on business combination 9,030,779  
Gross | Fibria | Supplier agreements    
Intangible assets with determined useful life    
Fair value adjustment on business combination 172,094  
Gross | Fibria | Port services agreements    
Intangible assets with determined useful life    
Fair value adjustment on business combination 694,590  
Gross | Fibria | Port concession    
Intangible assets with determined useful life    
Fair value adjustment on business combination 54,470  
Gross | Fibria | Lease agreements    
Intangible assets with determined useful life    
Fair value adjustment on business combination 44,371  
Gross | Fibria | Cultivars    
Intangible assets with determined useful life    
Fair value adjustment on business combination 142,744  
Accumulated Depreciation and Amortization | Fibria    
Intangible assets with determined useful life    
Fair value adjustment on business combination (956,577)  
Accumulated Depreciation and Amortization | Fibria | Software    
Intangible assets with determined useful life    
Business combination (4,100)  
Accumulated Depreciation and Amortization | Fibria | Customer portfolio    
Intangible assets with determined useful life    
Business combination (820,980)  
Accumulated Depreciation and Amortization | Fibria | Supplier agreements    
Intangible assets with determined useful life    
Business combination (72,097)  
Accumulated Depreciation and Amortization | Fibria | Port services agreements    
Intangible assets with determined useful life    
Business combination (29,362)  
Accumulated Depreciation and Amortization | Fibria | Port concession    
Intangible assets with determined useful life    
Business combination (2,147)  
Accumulated Depreciation and Amortization | Fibria | Lease agreements    
Intangible assets with determined useful life    
Business combination (7,499)  
Accumulated Depreciation and Amortization | Fibria | Cultivars    
Intangible assets with determined useful life    
Business combination (20,392)  
Accumulated Depreciation and Amortization | Facepa    
Intangible assets with determined useful life    
Fair value adjustment on business combination (15,430)  
Accumulated Depreciation and Amortization | Ibema    
Intangible assets with determined useful life    
Fair value adjustment on business combination R$ (24)