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Financial Statements Schedule: Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Disclosure Of Details Of Valuation And Qualifying Accounts
   
January 1
   
Additions
charged to
expense or
deduction
of revenue
   
Deduction /
Write-offs /

Reversal
   
December 31
 
   
NT$000
   
NT$000
   
NT$000
   
NT$000
 
Year of 2018 :
        
Allowance for impairment of property, plant and equipment
   320,455    —      (2,862)    317,593 
Allowance for impairment of obsolescence and decline in market value of inventories
   53,714    —      (17,557)    36,157 
Provision for deficiency compensation
   57,155    14,211    (42,014)    29,352 
Sales for allowance
   70,156    44,950    (82,479)    32,627 
Year of 2019 :
        
Allowance for impairment of property, plant and equipment
   317,593    9,938    (134,191)    193,340 
Allowance for impairment of obsolescence and decline in market value of inventories
   36,157    27,341    —      63,498 
Provision for deficiency compensation
   29,352    5,204    (32,558)    1,998 
Sales for allowance
   32,627    63,863    (70,490)    26,000 
Year of 2020 :
        
Allowance for impairment of property, plant and equipment
   193,340    —      (11,338)    182,002 
Allowance for impairment of obsolescence and decline in market value of inventories
   63,498    16,317    —      79,815 
Provision for deficiency compensation
   1,998    4,358    (2,893)    3,463 
Sales for allowance
   26,000    21,916    (38,052)    9,864