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Financial Instruments - Summary of Maturity Analysis for Non-derivative Financial Liabilities (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($)
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Less than 1 month [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | $ 87,258,757 | $ 2,839,530 | $ 75,266,483
Less than 1 month [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 120,733 | 3,929 | 84,978
Less than 1 month [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 65,356,106 | 2,126,785 | 52,353,176
Less than 1 month [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 9,251,237 | 301,049 | 12,565,548
Less than 1 month [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 12,530,681 | 407,767 | 10,262,781
1 to 3 months [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 54,280,316 | 1,766,362 | 56,572,557
1 to 3 months [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 201,686 | 6,563 | 157,710
1 to 3 months [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 33,887,460 | 1,102,748 | 48,140,652
1 to 3 months [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 10,982,036 | 357,372 | 5,180,527
1 to 3 months [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 9,209,134 | 299,679 | 3,093,668
3 months to 1 year [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 30,644,761 | 997,227 | 37,298,883
3 months to 1 year [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 790,427 | 25,722 | 687,144
3 months to 1 year [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 11,145,612 | 362,695 | 10,216,253
3 months to 1 year [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 9,652,804 | 314,117 | 13,416,893
3 months to 1 year [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 9,055,918 | 294,693 | 12,978,593
1-5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 141,300,566 | 4,598,131 | 158,925,804
1-5 years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 2,685,977 | 87,406 | 2,585,624
1-5 years [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 20,498 | 667 | 291,480
1-5 years [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 93,837,521 | 3,053,613 | 112,493,242
1-5 years [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 44,756,570 | 1,456,445 | 43,555,458
More than 5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 10,899,888 | 354,699 | 18,018,340
More than 5 years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 5,147,266 | 167,500 | 4,929,602
More than 5 years [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 74,643 | 2,429 | 114,201
More than 5 years [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 5,648,699 | 183,817 | 7,494,670
More than 5 years [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | $ 29,280 | $ 953 | $ 5,479,867

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