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Financial Risk and Fair Value Disclosures - Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments and Contractual Maturity (Detail) - TWD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]    
Short-term loans $ 8,683,215 $ 13,780,612
Payables 42,136,632 52,202,821
Guarantee deposits 42,874,494 41,599,386
Bonds payable 31,281,434 40,232,586
Long-term loans 39,416,145 25,290,536
Lease liabilities 8,220,632 6,897,571
Total 172,612,552 180,003,512
Net settlement-outflow (1,039)  
Not later than one year [member]    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]    
Short-term loans 8,683,215 13,780,612
Payables 42,136,632 52,202,821
Guarantee deposits 921,134 1,476,430
Bonds payable 340,976 14,797,772
Long-term loans 6,354,561 2,872,168
Lease liabilities 830,618 649,879
Total 59,267,136 85,779,682
Net settlement-outflow (1,039)  
Later than two years and not later than three years [member]    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]    
Short-term loans 0 0
Payables 0 0
Guarantee deposits 4,571,633 3,556,179
Bonds payable 16,675,030 10,980,506
Long-term loans 11,490,087 14,406,101
Lease liabilities 1,509,438 1,311,239
Total 34,246,188 30,254,025
Net settlement-outflow 0  
Later than four years and not later than five years [member]    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]    
Short-term loans 0 0
Payables 0 0
Guarantee deposits 27,522,150 25,955,654
Bonds payable 12,146,745 12,321,345
Long-term loans 21,478,391 5,071,743
Lease liabilities 1,437,870 1,223,724
Total 62,585,156 44,572,466
Net settlement-outflow 0  
Later than five years [member]    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]    
Short-term loans 0 0
Payables 0 0
Guarantee deposits 9,859,577 10,611,123
Bonds payable 2,118,683 2,132,963
Long-term loans 93,106 2,940,524
Lease liabilities 4,442,706 3,712,729
Total 16,514,072 $ 19,397,339
Net settlement-outflow $ 0