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Business combinations (Details Text) (Detail) - BRL (R$)
R$ in Thousands
1 Months Ended 12 Months Ended
Dec. 05, 2018
Apr. 27, 2018
Mar. 12, 2018
Jan. 15, 2018
Dec. 31, 2017
Nov. 30, 2017
Oct. 03, 2017
May 02, 2017
Jan. 01, 2017
Nov. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 31, 2017
BCPS                            
Business combinations (Details Text)                            
Ownership interest acquired         99.50%             99.50%    
Amount paid in the acquisition, which was settled in cash on that date                 R$ 407          
Fair value of the acquired assets                 568          
Fair value of the assumed liabilities                 75          
Bargain purchase gain                 R$ 87          
R2TECH                            
Business combinations (Details Text)                            
Ownership interest acquired               51.00%       51.00%    
The consideration for the purchase                       R$ 9,200    
Consideration in variable installments subjects to specific target in 2018                       R$ 3,500    
BIVA                            
Business combinations (Details Text)                            
Ownership interest acquired   2.40% 0.50% 15.10%   59.30% 51.40%     59.30% 59.30% 77.35% 59.30%  
Fair value of the acquired assets                           R$ 2,350
Fair value of the assumed liabilities                           997
The consideration for the purchase           R$ 2,394       R$ 2,394   R$ 5,389    
The total consideration paid for the purchases, which was settled in cash on the acquisition date                           18,470
Goodwill                           R$ 17,117
Additional interest of acquired           7.90%       7.90%        
TILIX                            
Business combinations (Details Text)                            
Ownership interest acquired 100.00%                     100.00%    
The consideration for the purchase R$ 19,610                          
Goodwill 19,175                          
Consideration for the purchase settled in cash 3,810                          
Consideration in variable installments 15,800                          
Consideration in variable installments subjects to specific target in 2020 4,100                          
Consideration in variable installments subjects to specific target in 2021 R$ 11,700