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LEASES - Lease liabilities (Details) - BRL (R$) R$ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Lessee, Operating Leases, Present Value Of Lease Liabilities [Line Items] |  |  |
Present value of liabilities | R$ 6,845,742 | R$ 6,972,915 | R$ 6,243,782
Lands and farms |  |  |
Lessee, Operating Leases, Present Value Of Lease Liabilities [Line Items] |  |  |
Average rate - % p.a. (1) | 12.62% |  |
Maturity (2) | September/2053 |  |
Present value of liabilities | R$ 4,186,456 |  |
Machinery and equipment |  |  |
Lessee, Operating Leases, Present Value Of Lease Liabilities [Line Items] |  |  |
Average rate - % p.a. (1) | 11.65% |  |
Maturity (2) | April/2035 |  |
Present value of liabilities | R$ 260,099 |  |
Buildings |  |  |
Lessee, Operating Leases, Present Value Of Lease Liabilities [Line Items] |  |  |
Average rate - % p.a. (1) | 11.27% |  |
Maturity (2) | February/2031 |  |
Present value of liabilities | R$ 193,858 |  |
Ships and boats |  |  |
Lessee, Operating Leases, Present Value Of Lease Liabilities [Line Items] |  |  |
Average rate - % p.a. (1) | 11.25% |  |
Maturity (2) | February/2039 |  |
Present value of liabilities | R$ 2,184,265 |  |
Vehicles |  |  |
Lessee, Operating Leases, Present Value Of Lease Liabilities [Line Items] |  |  |
Average rate - % p.a. (1) | 11.10% |  |
Maturity (2) | November/2028 |  |
Present value of liabilities | R$ 21,064 |  |

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2025-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_47_b&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2025-01-01 -Paragraph C12 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_C12_a&doctype=Appendix&subtype=C -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
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- Definition Lessee, Operating Leases, Present Value Of Lease Liabilities [Line Items] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Maturity period of lease liabilities + References No definition available. + Details
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Namespace Prefix: | suz_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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