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v3.23.1

Share-based Payment Arrangements - Additional Information (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |
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Feb. 01, 2023 shares | May 31, 2021 shares $ / shares | Dec. 27, 2019 | Sep. 30, 2020 shares | Nov. 30, 2019 USD ($) shares | Dec. 31, 2022 USD ($) shares $ / shares | Dec. 31, 2022 TWD ($) shares $ / shares | Dec. 31, 2021 TWD ($) shares $ / shares | Dec. 31, 2020 TWD ($) shares $ / shares | Dec. 31, 2022 TWD ($) $ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  | 1,140,000 |  |  |  |  |  |
Retained earnings decreased | $ |  |  |  |  |  |  |  |  | $ 392,447 |
Options granted |  |  |  |  | 17,167,000 |  |  |  |  |
Compensation cost of employee share options |  |  |  |  |  | $ 32,211,000 | $ 989,843 | $ 699,211 | 955,575 |
Employee restricted stock awards plan [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Issued during the period ,Restricted stock award ,shares |  |  |  |  |  | 15,000,000 | 15,000,000 |  |  |
Par value per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 10
Fair value of the employee restricted stock award | $ |  |  |  |  |  | $ 92.4 |  |  |  |
Exercise price, per share | $ / shares |  |  |  |  |  |  |  | $ 0 |  |
USIE option plans [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Capital surplus decreased | $ |  |  |  |  |  |  |  |  | 1,120,111 |
USISH option plans [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Capital surplus decreased |  |  |  |  |  | $ 4,069,000 |  | $ 58,448 | $ 1,010,219 | $ 125,049
Options granted |  |  |  |  |  | 0 | 0 | 0 | 1,140,000 |
Number of equity instruments other than options granted |  |  |  |  |  | 0 | 0 | 281,000 | 672,000 |
USISH option plans [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  |  | 3.0 |  |  |  |  |
USISH option plans [member] | Weighted average [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  |  | 4.0 |  |  |  |  |
USISH option plans [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  |  | 5.0 |  |  |  |  |
ASE Inc. option plans [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Share option to purchase of ordinary shares |  |  |  |  |  | 0.5 | 0.5 |  |  |
Weighted average exercise price of share options | (per share) |  |  |  |  |  | $ 3 | $ 92.4 | $ 108.8 | $ 68.5 |
The Company Option Plans [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  |  |  | 10 years | 10 years |  |  |
Percentage of cash dividend per ordinary share exceeds market price |  |  |  |  |  | 1.50% | 1.50% |  |  |
USISH core employees stock ownership plan [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Compensation cost of employee share options | $ |  |  |  |  | $ 6,156,000 |  |  |  |  |
Share based compensation number of additional shares to be granted |  |  |  |  | 6,403,000 |  |  |  |  |
USISH core employees stock ownership plan [Member] | Phase One [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  | 4.5 |  |  |  |  |  |  |
USISH core employees stock ownership plan [Member] | Phase Two [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  | 3.5 |  |  |  |  |  |  |
USISH core employees stock ownership plan [Member] | Phase Three [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  | 2.5 |  |  |  |  |  |  |
USISH second share option plan [member] | Phase One [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  | 1.2 years |  |  |  |  |  |
USISH second share option plan [member] | Phase Two [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  | 2.2 years |  |  |  |  |  |
USISH second share option plan [member] | Phase Three [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  | 3.2 years |  |  |  |  |  |
USISH second share option plan [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  | 2.2 |  |  |  |  |  |
USISH second share option plan [member] | Weighted average [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  | 3.2 |  |  |  |  |  |
USISH second share option plan [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  | 4.2 years |  |  |  |  |  |
USISH restricted share plan [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  |  |  | 2 years |  |  |  |  |  |
Number of equity instruments other than options granted |  |  |  | 425,000 |  |  |  |  |  |
Period of lock in of ordinary shares to be issued upon satisfaction of performance conditions |  |  |  | 1 year 3 months 18 days |  |  |  |  |  |
Second Share Options Plan [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Options granted | 150,000,000 |  |  |  |  |  |  |  |  |
AMPI Option Plans [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  | 3,100,000 | 3,100,000 |  |  |
AMPI Option Plans [Member] | Share Option [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Valid term of share option plans |  | 10 years |  |  |  |  |  |  |  |
Number of share options, issued |  | 10,000,000 |  |  |  |  |  |  |  |
AMPI Option Plans [Member] | Bottom of range [member] | Share Option [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price, per share | $ / shares |  | $ 7.5 |  |  |  |  |  |  |  |
AMPI Option Plans [Member] | Top of range [member] | Share Option [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price, per share | $ / shares |  | $ 30 |  |  |  |  |  |  |  |

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