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SHORT-TERM DEBT AND LONG-TERM DEBT - Additional disclosures (Details) R$ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 BRL (R$) | May 31, 2023 BRL (R$) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 BRL (R$) | Sep. 30, 2022 USD ($)
Global Credit Line |  |  |  |  |
LOANS AND FINANCING |  |  |  |  |
Maximum borrowing capacity |  |  |  | R$ 4,236.0 | $ 875.0
Gerdau Acominas S.A. and Gerdau Acos Longo S.A. |  |  |  |  |
LOANS AND FINANCING |  |  |  |  |
Loan amount borrowed from top-tier financial institutions | R$ 600.5 | R$ 750.0 |  |  |
Loan, maturity term | 3 years | 2 years |  |  |
Gerdau Trade Inc. |  |  |  |  |
LOANS AND FINANCING |  |  |  |  |
Repayment of debt |  |  | $ 188.3 | R$ 931.1 |

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