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Financial Instruments - Summary of Fair Value of Financial Instruments that are Measured at Fair Value on a Recurring Basis (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL $ 6,135,793 $ 218,511 $ 5,288,996
Financial assets at FVTOCI 2,367,547 84,314 3,800,465
Financial liabilities at FVTPL 1,537,208 54,744 973,571
Investments in equity instruments designated at fair value through other comprehensive income 728,398 25,940 755,903
Trade receivables, net 1,012,736 36,066 1,014,872
Swap contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 99,312 3,537 56,561
Financial liabilities at FVTPL 1,448,972 51,602 862,581
Forward Exchange Contract [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 122,511 4,363 104,308
Financial liabilities at FVTPL 9,020 321 110,990
Quoted ordinary shares [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 4,064,438 144,745 3,460,123
Open-end mutual funds [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 339,338 12,085 662,290
Unquoted preferred shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 151,329 5,389 158,718
Unquoted preferred shares [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 385,440 13,726 377,440
Private-placement funds [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 1,124,754 40,055 603,718
Unquoted ordinary shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 567,377 20,206 565,028
Limited partnership [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 9,692 345 32,157
Unsecured subordinate corporate bonds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in debt instruments 1,012,736 36,066 1,014,872
Trade receivables, net 626,413 22,308 2,029,690
Forward exchange contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at FVTPL 9,020 321 110,990
Call options [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL     24,556
Call options [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL     24,556
Target redemption forward contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at FVTPL 79,216 2,821  
Level 1 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 4,403,776 156,830 4,122,413
Financial assets at FVTOCI 0 0  
Trade receivables, net 0 0  
Level 1 of fair value hierarchy [member] | Swap contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Financial liabilities at FVTPL 0 0  
Level 1 of fair value hierarchy [member] | Forward Exchange Contract [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Financial liabilities at FVTPL 0 0  
Level 1 of fair value hierarchy [member] | Quoted ordinary shares [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 4,064,438 144,745 3,460,123
Level 1 of fair value hierarchy [member] | Open-end mutual funds [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 339,338 12,085 662,290
Level 1 of fair value hierarchy [member] | Unquoted preferred shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Investments in equity instruments designated at fair value through other comprehensive income 0 0  
Level 1 of fair value hierarchy [member] | Unquoted preferred shares [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Level 1 of fair value hierarchy [member] | Private-placement funds [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Level 1 of fair value hierarchy [member] | Unquoted ordinary shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Investments in equity instruments designated at fair value through other comprehensive income 0 0  
Level 1 of fair value hierarchy [member] | Limited partnership [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 0 0  
Level 1 of fair value hierarchy [member] | Unsecured subordinate corporate bonds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in debt instruments 0 0  
Trade receivables, net 0 0  
Level 1 of fair value hierarchy [member] | Target redemption forward contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at FVTPL 0 0  
Level 2 of fair value hierarchy [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 221,823 7,900 160,869
Financial assets at FVTOCI 0 0  
Financial liabilities at FVTPL 1,537,208 54,744 973,571
Level 2 of fair value hierarchy [Member] | Swap contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 99,312 3,537 56,561
Financial liabilities at FVTPL 1,448,972 51,602 862,581
Level 2 of fair value hierarchy [Member] | Forward Exchange Contract [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 122,511 4,363 104,308
Level 2 of fair value hierarchy [Member] | Quoted ordinary shares [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Level 2 of fair value hierarchy [Member] | Open-end mutual funds [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Level 2 of fair value hierarchy [Member] | Unquoted preferred shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Investments in equity instruments designated at fair value through other comprehensive income 0 0  
Level 2 of fair value hierarchy [Member] | Unquoted preferred shares [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Level 2 of fair value hierarchy [Member] | Private-placement funds [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Level 2 of fair value hierarchy [Member] | Unquoted ordinary shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Investments in equity instruments designated at fair value through other comprehensive income 0 0  
Level 2 of fair value hierarchy [Member] | Limited partnership [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 0 0  
Level 2 of fair value hierarchy [Member] | Unsecured subordinate corporate bonds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in debt instruments 0 0  
Trade receivables, net 0 0  
Level 2 of fair value hierarchy [Member] | Forward exchange contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at FVTPL 9,020 321 110,990
Level 2 of fair value hierarchy [Member] | Target redemption forward contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at FVTPL 79,216 2,821  
Level 3 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 1,510,194 53,781 1,005,714
Financial assets at FVTOCI 2,367,547 84,314 3,800,465
Trade receivables, net 0 0  
Level 3 of fair value hierarchy [member] | Swap contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Financial liabilities at FVTPL 0 0  
Level 3 of fair value hierarchy [member] | Forward Exchange Contract [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Financial liabilities at FVTPL 0 0  
Level 3 of fair value hierarchy [member] | Quoted ordinary shares [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Level 3 of fair value hierarchy [member] | Open-end mutual funds [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 0 0  
Level 3 of fair value hierarchy [member] | Unquoted preferred shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 151,329 5,389 158,718
Level 3 of fair value hierarchy [member] | Unquoted preferred shares [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 385,440 13,726 377,440
Level 3 of fair value hierarchy [member] | Private-placement funds [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 1,124,754 40,055 603,718
Level 3 of fair value hierarchy [member] | Unquoted ordinary shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 567,377 20,206 565,028
Level 3 of fair value hierarchy [member] | Limited partnership [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 9,692 345 32,157
Level 3 of fair value hierarchy [member] | Unsecured subordinate corporate bonds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in debt instruments 1,012,736 36,066 1,014,872
Trade receivables, net 626,413 22,308 2,029,690
Level 3 of fair value hierarchy [member] | Call options [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL     $ 24,556
Level 3 of fair value hierarchy [member] | Target redemption forward contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at FVTPL $ 0 $ 0