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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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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.

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The amount of expense relating to general and administrative activities of the entity.

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The amount of all operating expenses.

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