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17. Borrowings and financing (Details 4) R$ in Thousands	12 Months Ended
	Dec. 31, 2018 BRL (R$)
17th issue - series 1
SummaryOfBorrowingsAndFinancingLineItems [Line Items]
Amount	R$ 144,391
Maturity	15-Jan-18
Interest rates	CDI
17th issue - series 2
SummaryOfBorrowingsAndFinancingLineItems [Line Items]
Amount	R$ 348,434
Maturity	15-Feb-18
Interest rates	IPCA
20th issue
SummaryOfBorrowingsAndFinancingLineItems [Line Items]
Amount	R$ 250,000
Maturity	20-Dec-18
Interest rates	CDI
10th issue
SummaryOfBorrowingsAndFinancingLineItems [Line Items]
Amount	R$ 42,438
Maturity	2018	[1]
Interest rates	TJLP/IPCA
12th issue
SummaryOfBorrowingsAndFinancingLineItems [Line Items]
Amount	R$ 45,450
Maturity	2018	[1]
Interest rates	TR
14th issue
SummaryOfBorrowingsAndFinancingLineItems [Line Items]
Amount	R$ 40,726
Maturity	2018	[1]
Interest rates	TJLP/IPCA
18th issue
SummaryOfBorrowingsAndFinancingLineItems [Line Items]
Amount	R$ 33,641
Maturity	2018	[1]
Interest rates	TJLP/IPCA
[1] Amounts paid during the year.

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- Definition

The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The maturity of borrowings. [Refer: Borrowings]

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