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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

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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

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Namespace Prefix:	ggb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration