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Profit Before Income Tax - Summary of Employee Benefits Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Post-employment benefits        
Defined contribution plans $ 3,590,439 $ 116,838 $ 3,489,642 $ 2,979,167
Defined benefit plans 188,141 6,123 214,599 217,186
Post-employment benefits 3,778,580 122,961 3,704,241 3,196,353
Equity-settled share-based payments 989,843 32,211 699,211 955,575
Other employee benefits 98,404,937 3,202,243 90,412,118 76,648,412
Employee benefits expense 103,173,360 3,357,415 94,815,570 80,800,340
Operating costs [member]        
Post-employment benefits        
Employee benefits expense 65,063,705 2,117,270 61,555,563 52,526,164
Operating expense [member]        
Post-employment benefits        
Employee benefits expense $ 38,109,655 $ 1,240,145 $ 33,260,007 $ 28,274,176