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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, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL $ 8,934,151 $ 290,731 $ 5,436,280
Unsecured subordinate corporate bonds 1,059,712 34,485 1,076,458
Trade receivables, net 5,402,714 175,812 6,092,462
Financial assets at FVTOCI 6,944,985 226,000 8,112,274
Financial liabilities at FVTPL 626,760 20,396 417,660
Swap contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 3,205,828 104,323 85,629
Financial liabilities at FVTPL 543,547 17,688 360,797
Forward exchange contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 246,710 8,028 23,373
Financial liabilities at FVTPL 83,213 2,708 56,863
Quoted ordinary shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 45,683 1,486 102,124
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 2,521,964 82,069 2,683,193
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 293,385 9,547 334,223
Unquoted preferred shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 13,883 452 11,245
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 628,156 20,441 583,270
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 1,599,932 52,064 1,322,686
Unquoted ordinary shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 419,491 13,651 820,779
Contingent considerations [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 438,176 14,259 394,943
Limited partnership [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 3,502 114 9,206
Target redemption forward contracts [member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL     500
Call option and put option of convertible bonds [Member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL     8,463
Level 1 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 2,815,349 91,616 3,017,416
Financial assets at FVTOCI 45,683 1,486 102,124
Level 1 of fair value hierarchy [member] | Quoted ordinary shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at FVTOCI, Investments in equity instruments 45,683 1,486 102,124
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 2,521,964 82,069 2,683,193
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 293,385 9,547 334,223
Level 2 of fair value hierarchy [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 3,452,538 112,351 117,965
Financial liabilities at FVTPL 626,760 20,396 417,660
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 3,205,828 104,323 85,629
Financial liabilities at FVTPL 543,547 17,688 360,797
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 assets mandatorily classified as at FVTPL 246,710 8,028 23,373
Financial liabilities at FVTPL 83,213 2,708 56,863
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 assets mandatorily classified as at FVTPL     500
Level 2 of fair value hierarchy [Member] | Call option and put option of convertible bonds [Member] | Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL     8,463
Level 3 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 2,666,264 86,764 2,300,899
Unsecured subordinate corporate bonds 1,059,712 34,485 1,076,458
Trade receivables, net 5,402,714 175,812 6,092,462
Financial assets at FVTOCI 6,899,302 224,514 8,010,150
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 13,883 452 11,245
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 628,156 20,441 583,270
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 1,599,932 52,064 1,322,686
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 419,491 13,651 820,779
Level 3 of fair value hierarchy [member] | Contingent considerations [member] | Non derivative financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets mandatorily classified as at FVTPL 438,176 14,259 394,943
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 $ 3,502 $ 114 $ 9,206