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Consolidation of subsidiaries (Details Text) (Detail) - BRL (R$)
R$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 12, 2018
Jan. 15, 2018
May 02, 2017
May 31, 2016
Jul. 31, 2013
Apr. 30, 2011
Mar. 31, 2018
Dec. 31, 2017
Mar. 29, 2018
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Consolidation of subsidiaries (Details Text)                          
Total equity             R$ 4,476,722 R$ 870,391   R$ 687,486 R$ 626,862 R$ 461,877 R$ 426,563
Net+Phone                          
Consolidation of subsidiaries (Details Text)                          
Total equity             R$ 34,634 R$ 43,958     44,317    
Ownership - %             99.99% 99.99%          
Boa Compra                          
Consolidation of subsidiaries (Details Text)                          
Total equity             R$ 20,666 R$ 19,962     R$ 12,034    
Ownership - %             99.99% 99.99%          
Boa Compra | UBN Internet Ltda. ("UBN"), a subsidiary of UOL, acquired equity interest                          
Consolidation of subsidiaries (Details Text)                          
Ownership - %           51.00%              
Boa Compra | UBN Internet Ltda. ("UBN"), a subsidiary of UOL, acquired additional                          
Consolidation of subsidiaries (Details Text)                          
Ownership - %         24.00%                
Boa Compra | UBN Internet Ltda. ("UBN"), a subsidiary of UOL, increasing its total ownership                          
Consolidation of subsidiaries (Details Text)                          
Ownership - %         75.00%                
Boa Compra | UBN Internet Ltda. ("UBN"), a subsidiary of UOL, acquired the remaining                          
Consolidation of subsidiaries (Details Text)                          
Ownership - %       25.00%                  
Boa Compra | UBN Internet Ltda. ("UBN"), a subsidiary of UOL, has became the owner of Boa Compra                          
Consolidation of subsidiaries (Details Text)                          
Ownership - %       100.00%                  
Boa Compra | Subsequently, UOL transferred its equity interest in Boa Compra to PagSeguro Brazil as a capital contribution                          
Consolidation of subsidiaries (Details Text)                          
Ownership - %       100.00%                  
BCPS                          
Consolidation of subsidiaries (Details Text)                          
Total equity             R$ 1,268 R$ 985          
Ownership - %             99.50% 99.50%          
R2TECH                          
Consolidation of subsidiaries (Details Text)                          
Total equity             R$ 2,330 R$ 1,566          
Ownership - %     51.00%       51.00% 51.00%          
BIVACO Holdings SA                          
Consolidation of subsidiaries (Details Text)                          
Ownership - %               51.41%          
BIVA                          
Consolidation of subsidiaries (Details Text)                          
Total equity             R$ (247) R$ 752          
Ownership - %             74.93% 59.31%          
Acquisition amount             R$ 4,650            
BIVA | Acquired an additional                          
Consolidation of subsidiaries (Details Text)                          
Ownership - % 0.50% 15.12%                      
BIVA | Brazil Business Unit                          
Consolidation of subsidiaries (Details Text)                          
Ownership - %               74.93%          
FIDC                          
Consolidation of subsidiaries (Details Text)                          
Total equity             R$ 188,353 R$ 181,759 R$ 20,000        
Ownership - %             90.00% 100.00%          
Rate the senior mezzanine quotes pay as a percentage of Interbank Deposit Certificate (CDI)             107.00%            
FIDC | Subordinated quotes                          
Consolidation of subsidiaries (Details Text)                          
Ownership - %               100.00%