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Financial Instruments - Sensitivity Analysis Of Reasonably Possible Change Non-Designated Foreign Currency Derivatives (Detail) - Currency risk [member] R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 BRL (R$)
Disclosure of risk management strategy related to hedge accounting [line items] |
Book value | R$ 2,976,759
Impact on profit or loss before tax | 297,676
Cash and cash equivalents-deposits [member] | United States of America, Dollars |
Disclosure of risk management strategy related to hedge accounting [line items] |
Book value | R$ 58,262
Reasonably possible change | 10.00%
Impact on profit or loss before tax | R$ 5,826
Short term investments-equity securities [member] | United States of America, Dollars |
Disclosure of risk management strategy related to hedge accounting [line items] |
Book value | R$ 2,908,470
Reasonably possible change | 10.00%
Impact on profit or loss before tax | R$ 290,847
Short term investments-others [member] | United States of America, Dollars |
Disclosure of risk management strategy related to hedge accounting [line items] |
Book value | R$ 10,027
Reasonably possible change | 10.00%
Impact on profit or loss before tax | R$ 1,003

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