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Earnings per share
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Earnings per share
 
34.
Earnings per share
 
    
Year ended December 31, 2019
  
    
Amount

after income
tax
     
Weighted average
number of ordinary
shares outstanding
     
Earnings

per share
  
Basic earnings per share
   
NT$000
     
In thousands
     
NT$
  
Profit attributable to equity holders of the Company
   
 
2,508,574
 
   
 
727,111
 
   
 
3.45
 
    
 
 
     
 
 
     
 
 
  
Diluted earnings per share
                           
Assumed conversion of all dilutive potential ordinary shares:
                           
Employees’ compensation
               9,879           
Restricted shares
               126           
             
 
 
           
Profit attributable to equity holders of the Company
   
 
2,508,574
 
   
 
737,116
 
   
 
3.40
 
    
 
 
     
 
 
     
 
 
  
 
    
Year ended December 31, 2020
  
    
Amount

after income
tax
     
Weighted average
number of ordinary
shares outstanding
     
Earnings

per share
  
Basic earnings per share
   
NT$000
     
In thousands
     
NT$
  
Profit attributable to equity holders of the Company
   
 
2,378,978
 
   
 
727,240
 
   
 
3.27
 
    
 
 
     
 
 
     
 
 
  
Diluted earnings per share
                           
Assumed conversion of all dilutive potential ordinary shares:
                           
Employees’ compensation
               9,668           
             
 
 
           
Profit attributable to equity holders of the Company
   
 
2,378,978
 
   
 
736,908
 
   
 
3.23
 
    
 
 
     
 
 
     
 
 
  
 
    
Year ended December 31, 2021
  
    
Amount

after income
tax
     
Weighted average
number of ordinary
shares outstanding
     
Earnings

per share
  
Basic earnings per share
   
NT$000
     
In thousands
     
NT$
  
Profit attributable to equity holders of the Company
   
 
4,937,267
 
   
 
727,240
 
   
 
6.79
 
    
 
 
     
 
 
     
 
 
  
Diluted earnings per share
                           
Assumed conversion of all dilutive potential ordinary shares:
                           
Employees’ compensation
               15,618           
             
 
 
           
Profit attributable to equity holders of the Company
   
 
4,937,267
 
   
 
742,858
 
   
 
6.65