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Income tax and social contribution (Details 3) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation Of The Income Tax And Social Contribution Expense [Abstract]      
Profit for the period before taxes R$ 683,504 R$ 155,359 R$ 40,315
Statutory rate 34.00% 34.00% 34.00%
Expected income tax and social contribution R$ (232,391) R$ (52,822) R$ (13,707)
Permanent additions (exclusions)      
Participation in the results of partners and managers (314)   (234)
Gifts (375)   (149)
R&D and technological innovation benefit - Law 11.196/05 24,987 15,898 11,596
Interest on own capital   8,860  
Tax Incentives - Law Rounet Art. 18 11,981    
Other additions 1,402 485 (2,333)
Income tax and social contribution expense (204,711) (27,580) (4,826)
Income tax and social contribution - current (214,988) (7,431) (2,587)
Income tax and social contribution - deferred R$ 10,278 R$ (20,149) R$ (2,239)