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RELATED-PARTY TRANSACTIONS - Key Management compensation and other information from related parties (Details)
R$ in Thousands
12 Months Ended
Dec. 31, 2023
BRL (R$)
EquityInstruments
shares
Dec. 31, 2022
BRL (R$)
EquityInstruments
Dec. 31, 2021
BRL (R$)
EquityInstruments
Dec. 31, 2020
BRL (R$)
EquityInstruments
Jan. 10, 2023
BRL (R$)
RELATED PARTY TRANSACTIONS          
Cost of social charges, related to the management R$ 17,077 R$ 20,455 R$ 23,266    
Investments in associates and jointly-controlled entities 3,858,449 3,896,518 3,340,775 R$ 2,271,629  
Brasil ao Cubo S.A.          
RELATED PARTY TRANSACTIONS          
Investments in associates and jointly-controlled entities         R$ 141,000
Key Management personnel (Board of Directors and executive officers)          
RELATED PARTY TRANSACTIONS          
Key management salaries, variable compensation and benefits 36,964 42,164 61,747    
Contributions to management's defined contribution pension plans 1,986 2,040 1,932 R$ 1,932  
Key management long-term incentive plans R$ 25,352 R$ 19,548 R$ 19,637    
Key Management personnel (Board of Directors and executive officers) | Restricted and Performance Shares          
Restricted shares granted to Management          
Balance, beginning of year | EquityInstruments 3,415,166 3,712,436 6,456,248    
Granted | EquityInstruments 2,705,702 840,496 709,990    
Exercised | EquityInstruments (938,953) (1,135,503) (3,453,802)    
Cancelled | EquityInstruments (404,922) (2,262)      
Share Bonus | shares (168,859)        
Balance, end of year | EquityInstruments 4,945,852 3,415,166 3,712,436 6,456,248  
Fundacao Gerdau, Instituto Gerdau and Fundacao Ouro Branco          
RELATED PARTY TRANSACTIONS          
Contributions to defined contribution pension plans R$ 41,763 R$ 36,860