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Supplementary cash flow information non-cash transactions (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplementary cash flow information non-cash transactions      
Additions to property, plant and equipment R$ (242,337)    
Additions to biological assets (120,495)    
Accounts payable for asset acquisition 402,832    
Acquisition of subsidiaries (40,000)    
Offsets of other taxes payable (133,165) R$ (363,614) R$ (413,053)
Actuarial liability gains (losses) (69,305) 4,173 (54,422)
Exchange variation on conversion of financial statements and on foreign investments 137,546 38,006 (45,720)
Reversal of time-barred dividends 66 29 26
Minimum mandatory dividends R$ (3,466) R$ (180,280) R$ (370,828)