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Income tax and social contribution (Details 1) (Detail) - BRL (R$)
R$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax            
Included in the statement of income R$ 6,391 R$ (2,468) R$ 12,748 R$ 10,278 R$ (20,149)  
Taken directly to equity         3,606  
Deferred tax 597 (18,542)   (5,794) (16,074) R$ 469
Tax losses            
Deferred tax            
Included in the statement of income 3,934 (874) 1,310 436 (2,312)  
Deferred tax 5,421 177   1,487 1,051 3,363
Tax credit            
Deferred tax            
Included in the statement of income (180)   (721) (721)    
Taken directly to equity         3,606  
Deferred tax 2,705 3,606   2,885 3,606  
Technological inovation            
Deferred tax            
Included in the statement of income [1] (11,344) (4,354) (12,460) (16,814) (18,121)  
Deferred tax [1] (52,536) (28,732)   (41,192) (24,378) (6,257)
Other temporary differences - ASSETS            
Deferred tax            
Included in the statement of income 23,054 2,759 26,236 28,995 284  
Deferred tax 55,696 R$ 6,406   32,642 R$ 3,647 R$ 3,363
Other Temporary Differences - LIABILITY            
Deferred tax            
Included in the statement of income (9,073)   R$ (1,616) (1,616)    
Deferred tax R$ (10,689)     R$ (1,616)    
[1] The main temporary differences representing the balance of the deferred tax liability refers to the benefit granted by the Technological Innovation Law (Lei do Bem), which reduces the tax charges on the capitalized amount of property and equipment.