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TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS - Contingent Assets (Details) R$ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2021 BRL (R$)	Dec. 31, 2023 BRL (R$) kW
TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS
Minimum industrial consumers monthly electricity consumption limit (in Kilo watt hour) | kW		2,000
Maximum period to return the compulsory loan to taxpayers		20 years
Gain on settlement of litigation, net of expenses incurred	R$ 1,391,280
Amount of other pending lawsuits		R$ 73,000
Estimation of contingent assets		845,000
Tax credits		253,000
Income and social contribution taxes line		270,000
Net credit		R$ 828,000
Monetization term		5 years

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- References

No definition available.

+ Details

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- Definition

The amount of estimation of contingent assets.

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The amount recognized upon the settlement of litigation, net of expenses incurred.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

It represents the maximum Period for returning of compulsory loan

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No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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- Definition

It represents the minimum Industrial consumers monthly electricity consumption limit for instituting compulsory loan.

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No definition available.

+ Details

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Namespace Prefix:	ggb_
Data Type:	dtr-types:powerItemType
Balance Type:	na
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- Definition

Amount of provision for expenses relating to income and social contribution taxes lines.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents monetization term of other contingent assets.

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No definition available.

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Data Type:	xbrli:durationItemType
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- Definition

Amount of other contingent assets arising from tax credit net of expenses.

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Amount of other contingent assets arising from tax credits.

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No definition available.

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Namespace Prefix:	ggb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of other pending lawsuits.

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No definition available.

+ Details

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Namespace Prefix:	ggb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration