XML 171 R148.htm IDEA: XBRL DOCUMENT
v3.21.1

OBLIGATIONS WITH FIDC - INVESTMENT FUND IN CREDIT RIGHTS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
OBLIGATIONS WITH FIDC - INVESTMENT FUND IN CREDIT RIGHTS |  |
Current obligations with FIDC | R$ 944,513 | R$ 0
Non-current obligations with FIDC | R$ 42,893 | R$ 1,018,501

X
- Definition Current portion of amounts payable regarding repurchase receivables from the Credit Right Investment Fund. + References No definition available. + Details
Name: | ggb_CurrentObligationsWithSecuritiesAndExchangeCommissionOfBrazil
Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Noncurrent portion of amounts payable regarding repurchase receivables from the Credit Right Investment Fund. + References No definition available. + Details
Name: | ggb_NoncurrentObligationsWithSecuritiesAndExchangeCommissionOfBrazil
Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition NA. + References No definition available. + Details
Name: | ggb_ObligationsWithSecuritiesAndExchangeCommissionOfBrazilAndInvestmentFundInCreditRightsAbstract
Namespace Prefix: | ggb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration