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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Risk classification of trade accounts receivable (Details) - Trade accounts receivable - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Expected credit losses	R$ 41,889	R$ 41,996	R$ 37,179
Credit risk
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Credit risk exposure	2,957,095	3,077,813
Expected credit losses	41,889	41,996
Credit risk | Low Risk | Current and overdue to 30 days
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Credit risk exposure	2,813,038	2,775,364
Credit risk | Average Risk | Overdue between 30 and 90 days
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Credit risk exposure	54,115	168,836
Credit risk | High Risk | Overdue more than 90 days
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Credit risk exposure	R$ 89,942	R$ 133,613

X

- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2020-01-01
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-URIDate 2020-01-01

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- 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

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- Definition

The amount of credit exposure that has not been rated by external rating agencies. [Refer: Credit exposure]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph IG24
-Subparagraph c
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