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Inventories - Changes in provision for losses (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Changes in provision for losses |  |
Balance at the beginning of the year | R$ (51,911) | R$ (28,206)
Constitution/Reversal of provisions | (4,732) | (31,482)
Write-off inventories | 23,447 | 7,777
Balance at the end of the year | (33,195) | (51,911)
Additional write-offs for specific projects | R$ 29,828 | R$ 7,687

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- Definition Amount of increase in the inventory valuation allowance during the reporting period. + References No definition available. + Details
Name: | suzby_AdditionsToValuationAllowanceInventory
Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | suzby_ChangesInProvisionForInventoryLossesAbstract
Namespace Prefix: | suzby_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of valuation reserve for inventory. + References No definition available. + Details
Name: | suzby_IfrsInventoryValuationReserves
Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References No definition available. + Details
Name: | suzby_IfrsInventoryWriteDown
Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of loss from reductions in inventory from specific projects due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References No definition available. + Details
Name: | suzby_InventoryWriteDownSpecificProjects
Namespace Prefix: | suzby_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration