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Intangible assets (Details 1) (Detail) - BRL (R$)
R$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Intangible assets are composed as follows      
Intangible assets R$ 190,638 R$ 158,868 R$ 86,108
Expenditures related to software and technology      
Intangible assets are composed as follows      
Intangible assets [1] 157,373 125,825 82,131
Software licenses      
Intangible assets are composed as follows      
Intangible assets 10,131 7,467 3,977
Customer relationships      
Intangible assets are composed as follows      
Intangible assets 1,735 1,890  
Goodwill      
Intangible assets are composed as follows      
Intangible assets 21,399 [2] 23,686 [3]  
Cost      
Intangible assets are composed as follows      
Intangible assets 327,575 276,667 149,382
Cost | Expenditures related to software and technology      
Intangible assets are composed as follows      
Intangible assets [1] 291,666 241,490 143,989
Cost | Software licenses      
Intangible assets are composed as follows      
Intangible assets 12,529 9,510 5,393
Cost | Customer relationships      
Intangible assets are composed as follows      
Intangible assets 1,981 1,981  
Cost | Goodwill      
Intangible assets are composed as follows      
Intangible assets 21,399 [2] 23,686 [3]  
Accumulated amortization      
Intangible assets are composed as follows      
Intangible assets (136,937) (117,799) (63,274)
Accumulated amortization | Expenditures related to software and technology      
Intangible assets are composed as follows      
Intangible assets [1] (134,293) (115,665) (61,858)
Accumulated amortization | Software licenses      
Intangible assets are composed as follows      
Intangible assets (2,398) (2,043) R$ (1,416)
Accumulated amortization | Customer relationships      
Intangible assets are composed as follows      
Intangible assets R$ (246) R$ (91)  
[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.