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EMPLOYEE BENEFIT PLANS - Changes in actuarial liability (Details) - Defined benefit plan - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Changes in actuarial liability
Actuarial liabilities balance, beginning of the year	R$ 430,427	R$ 351,263
Business combination with Fibria	147,877
Interest on employee benefits	44,496	35,920
Actuarial loss	147,640	69,305
Benefits paid in the year	(34,261)	(26,061)
Actuarial liabilities balance, end of the year	R$ 736,179	R$ 430,427

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Business combinations [member]; Net defined benefit liability (asset)]

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

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