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Financial Risk Management and Fair Values of Financial Instruments - Maturity Profile of Non-derivative Financial Liabilities Based on Contracted Undiscounted Payments (Detail) - TWD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term bank loans $ 15,580,584 $ 14,643,068
Lease liabilities 1,257,694 1,118,787
Guarantee deposits 21,235 21,600
Total 16,859,513 15,783,455
Within 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term bank loans 2,469,744 1,699,165
Lease liabilities 267,759 174,460
Total 2,737,503 1,873,625
1 to 3 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term bank loans 7,506,844 5,675,288
Lease liabilities 250,104 182,767
Total 7,756,948 5,858,055
3 to 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term bank loans 4,273,199 5,354,335
Lease liabilities 57,856 57,057
Total 4,331,055 5,411,392
Over 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term bank loans 1,330,797 1,914,280
Lease liabilities 681,975 704,503
Guarantee deposits 21,235 21,600
Total $ 2,034,007 $ 2,640,383