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v3.25.3

Inventories - Roll-forward of estimated losses (Details) - BRL (R$) R$ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Inventories [Line Items] |  |
Opening Balance | R$ 97,934 | R$ 95,053
Additional allowance recognised in profit or loss, allowance account for credit losses | 30,683 | 83,705
Reversal Allowance Account For Credit Losses Financial Assets | 6,652 | 6,352
Utilisation Allowance Account For Credit Losses Financial Assets | 17,756 | 74,472
Closing Balance | R$ 104,209 | R$ 97,934

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- Definition Additional allowance recognised in profit or loss, allowance account for credit losses + References No definition available. + Details
Name: | suz_AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLosses
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element should be used to tag non-restated comparative information only. Allowance account for credit losses of financial assets at beginning of period. Allowance account for credit losses of financial assets at end of period + References No definition available. + Details
Name: | suz_AllowanceAccountForCreditLossesFinancialAssets
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Inventories [Line Items] + References No definition available. + Details
Name: | suz_InventoriesLineItems
Namespace Prefix: | suz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reversal Allowance Account For Credit Losses Financial Assets + References No definition available. + Details
Name: | suz_ReversalAllowanceAccountForCreditLossesFinancialAssets
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Utilisation Allowance Account For Credit Losses Financial Assets + References No definition available. + Details
Name: | suz_UtilisationAllowanceAccountForCreditLossesFinancialAssets
Namespace Prefix: | suz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration