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LEASE - Reconciliation of operating lease commitments (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Jan. 01, 2019
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LEASE |  |
Operating lease commitments disclosed as of December 31, 2018 | R$ 1,448,241 |
Business combination with Fibria |  | R$ 2,974,729
Discounted through a lessee's incremental loan rate at initial adoption |  | (1,011,726)
Reclassification from loans and financing |  | 18,225
Agreements revalued as service agreements |  | (572)
Operating lease commitments as of January 1, 2019 |  | R$ 3,428,897

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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Period Type: | duration

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- Definition The amount of adjustment upon adoption of new accounting standard for the discount using the lessee's incremental loan rate. + References No definition available. + Details
Name: | suzby_AdjustmentToLeaseLiabilitiesUponAdoptionOfNewAccountingStandardDiscountedAmount
Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of adjustment upon adoption of new accounting standard for the reclassification to service agreements. + References No definition available. + Details
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Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of adjustment to lease liabilities related to lease commitments assumed in a business combination. + References No definition available. + Details
Name: | suzby_AdjustmentsToLeaseLiabilitiesRelatedToAssumedLeaseCommitmentsFromBusinessCombination
Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amounts recognized as operating lease liabilities due to the initial application of IFRS 16 for the remaining balances of agreements previously classified as financial leases under IAS17. + References No definition available. + Details
Name: | suzby_AmountsRecognizedAsOperatingLeaseLiabilitiesDueToAdoptionOfIfrs16ForAgreementsPreviouslyClassifiedAsFinanceLeasesUnderIas17
Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition The amount of increase (decrease) to lease liabilities upon adoption of new accounting standard. + References No definition available. + Details
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Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The portion of operating lease payments that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with any amounts guaranteed by the lessee or by a party related to the lessee recognised as an expense. + References No definition available. + Details
Name: | suzby_MinimumOperatingLeasePaymentsIas17
Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration