Derivative Financial Instruments Terphane Future Cash Flow Hedges (Details) - Terphane Ltda [Member] R$ in Thousands, $ in Thousands	Sep. 30, 2019 BRL (R$)	Sep. 30, 2019 USD ($)
Derivative [Line Items]
Derivative, Notional Amount	R$ 85,792	$ 22,200
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3.9	3.9
Oct-19 [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 7,056	$ 1,800
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,920.3	3,920.3
Nov-19 [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 7,080	$ 1,800
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,933.1	3,933.1
Dec-19 [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 7,102	$ 1,800
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,945.5	3,945.5
Jan-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,315	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,796.6	3,796.6
Feb-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,326	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,804.1	3,804.1
Mar-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,332	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,808.6	3,808.6
Apr-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,343	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,816.3	3,816.3
May-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,354	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,824.4	3,824.4
Jun-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,365	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,832.3	3,832.3
Jul-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,380	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,842.6	3,842.6
Aug-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,396	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,854.5	3,854.5
Sep-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,412	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,865.6	3,865.6
Oct-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,428	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,876.9	3,876.9
Nov-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,443	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,887.7	3,887.7
Dec-20 [Member] [Member]
Derivative [Line Items]
Derivative, Notional Amount	R$ 5,460	$ 1,400
Percentage of Coverage Using Cash Flow Hedges	0.00%	0.00%
Foreign Currency Exchange Rate, Translation	3,899.7	3,899.7