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INCOME AND SOCIAL CONTRIBUTION TAXES - Rollforward (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Rollforward of net balance of deferred income tax    
Beginning balance R$ (1,029,135) R$ (1,787,354)
Business combination with Fibria 1,034,842  
Tax loss 270,559 (264,955)
Tax loss carryforwards 139,719 (23,203)
(Reversal)/provision for judicial liabilities 31,262 (1,964)
Operating provisions and other losses (21,757) 82,785
Exchange rate variation - Taxation on a cash basis 552,421 451,300
Derivative losses 319,860 390,198
Fair value adjustment on business combination - Amortization 699,527 5,327
Unrealized profit on inventories 65,492 124,454
Lease (3,274) 69
Adjustment to present value   174
Tax benefit on unamortized goodwill (203,696) (3,098)
Property, plant and equipment - Deemed cost 46,359 51,408
Accelerated depreciation 82,982 (13,067)
Borrowing cost 44,727 (23,145)
Fair value of biological assets (60,778) (22,307)
Tax provision on results of subsidiaries abroad (351,485)  
Tax credits - gains in tax lawsuit (ICMS from the PIS/COFINS calculation basis) (43,559)  
Other temporary differences (18,901) 4,243
Ending balance R$ 1,555,165 R$ (1,029,135)