XML 98 R75.htm IDEA: XBRL DOCUMENT
v3.21.1

TRADE ACCOUNTS RECEIVABLE - Summary (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable | R$ 3,737,270 | R$ 2,672,370
Gross | in Brazil |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable | 2,081,740 | 1,193,971
Gross | exports from Brazil |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable | 26,121 | 117,274
Gross | outside of Brazil |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable | 1,766,555 | 1,459,204
Accumulated impairment losses |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable | R$ (137,146) | R$ (98,079)

X
- Definition The amount of current trade receivables. [Refer: Trade receivables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 68 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_68&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_CurrentTradeReceivables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ggb_TradeAccountsReceivablesCountryOfDomicileMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ggb_TradeAccountsReceivablesCountryOfDomicileExportsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ggb_TradeAccountsReceivablesForeignCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_AccumulatedImpairmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |