XML 96 R73.htm IDEA: XBRL DOCUMENT
v3.19.1

TRADE ACCOUNTS RECEIVABLE - Accounts receivable by aging (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | R$ 3,201,656 | R$ 2,798,420
Impairment loss on trade receivables |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | (158,157) | (131,639)
Current | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 2,362,408 | 2,234,723
Past due: Up to 30 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 792,569 | 467,901
Past due: From 31 to 60 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 63,294 | 96,852
Past due: From 61 to 90 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 10,133 | 17,636
Past due: From 91 to 180 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 22,261 | 27,841
Past due: From 181 to 360 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 26,003 | 22,985
Past due: Above 360 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | R$ 83,145 | R$ 62,121

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 2018-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 68 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_68&doctype=Standard -URIDate 2018-03-16 + 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_AllowanceForCreditLossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_CurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanOneMonthAndNotLaterThanTwoMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanThreeMonthsAndNotLaterThanFourMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_PastDueStatusAxis=ggb_LaterThanFourMonthsAndNotLaterThanSevenMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_PastDueStatusAxis=ggb_LaterThanSevenMonthsAndNotLaterThanThirteenMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_PastDueStatusAxis=ggb_LaterThanThirteenMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |