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Employee benefits (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Employee Benefits Provisions

     31 December
2018		      31 December
2017		  

Retirement pay liability provision

      160,613        149,449  

Unused vacation provision

      64,134        48,217  
  

 

 

     

 

 

  
     224,747        197,666  
  

 

 

     

 

 

  

Summary of Movement in Provision for Employee Termination Benefits

Movements in provision for employee termination benefits are as follows:

 

     2018      2017  

1 January

      149,449        120,755  

Service cost

      26,971        32,696  

Remeasurements

      (12,699 )       3,738  

Interest expense

      16,957        13,877  

Benefit payments

      (20,065 )       (21,617 ) 
  

 

 

     

 

 

  

31 December

      160,613        149,449  
  

 

 

     

 

 

  

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 2018    Discount Rate     Inflation Rate  

Sensivity 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 ) 

 

31 December 2017    Discount Rate     Inflation Rate  

Sensivity Level

    1% increase     1% decrease     1% increase     1% decrease  

Change in assumption

      (14.6 %)      18.1 %      18.3 %      (14.3 %) 

Impact on provision for employee termination benefits

      (21,820 )      27,050       27,349       (21,371 )