v3.26.1
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, 2025
Dec. 31, 2024
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]    
Short-term loans $ 8,589,773 $ 8,683,215
Payables 45,055,193 42,136,632
Guarantee deposits 40,867,857 42,874,494
Bonds payable 52,374,053 31,281,434
Long-term loans 15,183,833 39,416,145
Lease liabilities 7,681,021 8,220,632
Total 169,751,730 172,612,552
Net settlement-outflow (2,512) (1,039)
Not later than one year [member]    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items]    
Short-term loans 8,589,773 8,683,215
Payables 45,055,193 42,136,632
Guarantee deposits 1,061,929 921,134
Bonds payable 17,033,209 340,976
Long-term loans 3,319,372 6,354,561
Lease liabilities 805,290 830,618
Total 75,864,766 59,267,136
Net settlement-outflow (2,512) (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 19,143,652 4,571,633
Bonds payable 25,278,203 16,675,030
Long-term loans 8,227,746 11,490,087
Lease liabilities 1,470,303 1,509,438
Total 54,119,904 34,246,188
Net settlement-outflow 0 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 13,847,566 27,522,150
Bonds payable 7,958,238 12,146,745
Long-term loans 3,612,205 21,478,391
Lease liabilities 1,434,794 1,437,870
Total 26,852,803 62,585,156
Net settlement-outflow 0 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 6,814,710 9,859,577
Bonds payable 2,104,403 2,118,683
Long-term loans 24,510 93,106
Lease liabilities 3,970,634 4,442,706
Total 12,914,257 16,514,072
Net settlement-outflow $ 0 $ 0