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1. COMPANY'S OPERATIONS (Details 2) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
DisclosureOfCompanysOperationsLineItems [Line Items] |  |  |  |
Cost of sales |  | R$ (29,998,822) | R$ (25,370,042) | R$ (25,320,753)
Direct and incremental expenditures [member] |  |  |  |
DisclosureOfCompanysOperationsLineItems [Line Items] |  |  |  |
Cost of sales | [1] | (356,960) |  |
Selling expenses |  | (56,307) |  |
General and administrative expenses |  | (86,032) |  |
Total expense |  | R$ (499,299) |  |
[1] | Includes non-incremental expenditures related do idleness in the amount of R$55,926.

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_103&doctype=Standard -URIDate 2020-01-01 + Details
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