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Employee benefits (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Employee Benefits Provisions
 
 
   
31 December
2019
   
31 December
2018
 
Retirement pay liability provision
   222,164    160,613 
Unused vacation provision
   72,167    64,134 
  
 
 
   
 
 
 
  
 
294,331
 
  
 
224,747
 
  
 
 
   
 
 
 
Summary of Movement in Provision for Employee Termination Benefits
Movements in provision for employee termination benefits are as follows:
 
   
2019
   
2018
 
1 January
   160,613    149,449 
Service cost
   35,831    26,971 
Remeasurements
   36,385    (12,699) 
Interest expense
   25,566    16,957 
Benefit payments
   (36,231)    (20,065) 
  
 
 
   
 
 
 
31 December
  
 
222,164
 
  
 
160,613
 
  
 
 
   
 
 
 
Summary of Sensitivity of Provision for Employee Termination Benefits to Changes in the Significant Actuarial Assumptions
The sensitivity of provision for employee termination benefits to changes in the significant actuarial assumptions is:
 
31 December 2019
  
Discount Rate
  
Inflation Rate
 
Sensitivity Level
  
1% increase
   
1% decrease
  
1% increase
  
1% decrease
 
Change in assumption
   (14.2%)    17.4%   17.9%   (14.7%) 
  
 
 
   
 
 
  
 
 
  
 
 
 
Impact on provision for employee termination benefits
   (31,547)    38,657   39,767   (32,658) 
  
 
 
   
 
 
  
 
 
  
 
 
 
 
31 December 2018
  
Discount Rate
  
Inflation Rate
 
Sensitivity Level
  
1% increase
   
1% decrease
  
1% increase
  
1% decrease
 
Change in assumption
   (13.0%)    15.7%   16.5%   (13.7%) 
  
 
 
   
 
 
  
 
 
  
 
 
 
Impact on provision for employee termination benefits
   (20,880)    25,216   26,501   (22,004)