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Financing - Operating lease agreements (Details) - Operating Leases R$ in Thousands	12 Months Ended
	Dec. 31, 2018 BRL (R$) item
Financing
Total duration of all forest cycles of eucalyptus	21 years
Number of forest cycles of eucalyptus | item	3
Operating Expense | Administrative offices and deposits | IGP-M, and IPCA/IBGE | Minimum
Financing
Monthly installment amount	R$ 1
Operating Expense | Administrative offices and deposits | IGP-M, and IPCA/IBGE | Maximum
Financing
Monthly installment amount	1,163
Operating Expense | Call center and licenses | IGP-DI | Minimum
Financing
Monthly installment amount	1
Operating Expense | Call center and licenses | IGP-DI | Maximum
Financing
Monthly installment amount	120
Operating Expense | Land and farms | IGP-M, IPCA/IBGE, and others | Minimum
Financing
Monthly installment amount	182
Operating Expense | Land and farms | IGP-M, IPCA/IBGE, and others | Maximum
Financing
Monthly installment amount	R$ 2,047

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The total duration of all forest cycles of eucalyptus, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

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The number of forest cycles of eucalyptus.

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Amount of the required monthly payments for operating leases.

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