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Intangible assets (Details 2) (Detail) - BRL (R$)
R$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in cost and accumulated amortization were as follows      
Opening balance R$ 158,868 R$ 86,108  
Additions 53,195 125,856  
Acquisition of subsidiary   1,429  
Others (2,287)    
Amortization (19,138) (54,526)  
Net book value 190,638 158,868 R$ 86,108
Cost      
Changes in cost and accumulated amortization were as follows      
Net book value 327,575 276,667 149,382
Accumulated amortization      
Changes in cost and accumulated amortization were as follows      
Net book value (136,937) (117,799) (63,274)
Expenditures related to software and technology      
Changes in cost and accumulated amortization were as follows      
Opening balance 125,825 82,131  
Additions 50,176 97,491  
Acquisition of subsidiary   10  
Amortization (18,628) (53,807)  
Net book value [1] 157,373 125,825 82,131
Expenditures related to software and technology | Cost      
Changes in cost and accumulated amortization were as follows      
Net book value [1] 291,666 241,490 143,989
Expenditures related to software and technology | Accumulated amortization      
Changes in cost and accumulated amortization were as follows      
Net book value [1] (134,293) (115,665) (61,858)
Software licenses      
Changes in cost and accumulated amortization were as follows      
Opening balance 7,467 3,977  
Additions 3,019 1,210  
Acquisition of subsidiary   1,419  
Transfer   1,488  
Amortization (355) (627)  
Net book value 10,131 7,467 3,977
Software licenses | Cost      
Changes in cost and accumulated amortization were as follows      
Net book value 12,529 9,510 5,393
Software licenses | Accumulated amortization      
Changes in cost and accumulated amortization were as follows      
Net book value (2,398) (2,043) R$ (1,416)
Customer relationships      
Changes in cost and accumulated amortization were as follows      
Opening balance 1,890    
Additions   971  
Transfer   1,010  
Amortization (155) (91)  
Net book value 1,735 1,890  
Customer relationships | Cost      
Changes in cost and accumulated amortization were as follows      
Net book value 1,981 1,981  
Customer relationships | Accumulated amortization      
Changes in cost and accumulated amortization were as follows      
Net book value (246) (91)  
Goodwill      
Changes in cost and accumulated amortization were as follows      
Opening balance 23,686    
Additions   26,184  
Others (2,287)    
Transfer   (2,498)  
Net book value 21,399 [2] 23,686 [3]  
Goodwill | Cost      
Changes in cost and accumulated amortization were as follows      
Net book value R$ 21,399 [2] R$ 23,686 [3]  
[1] PagSeguro Group capitalizes the expenses incurred with the development of platforms, which are amortized over the useful lives, within a range from three to five years.
[2] Goodwill provided on the acquisition of the companies R2TECH and BIVA.
[3] Goodwill provided on the acquisition of the companies R2TECH and BIVA as described in Note 10.