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Share-based Payment Arrangements - Summary of Information About ASE Inc. Option Plans (Detail) - The Company Option Plans [member] | 12 Months Ended
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Dec. 31, 2024 shares $ / shares | Dec. 31, 2023 TWD ($) shares $ / shares | Dec. 31, 2022 shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Number of options, beginning balance | 212,240,000 | 81,262,000 | 96,802,000
Options granted |  | 150,000,000 | 0
Number of options, forfeited | (5,873,000) | (1,471,000) | (1,206,000)
Number of options, exercised | (18,266,000) | (17,551,000) | (14,334,000)
Number of options, Ending balance | 188,101,000 | 212,240,000 | 81,262,000
Number of options, exercisable, end of year | 44,242,000 | 62,505,000 | 58,216,000
Weighted-average fair value of options granted (NT$) | 0 |  | 0
Weighted average exercise price, Beginning balance | $ / shares | $ 89.1 | $ 50.2 | $ 53.3
Options granted | $ / shares |  | 107 | 0
Weighted average exercise price, Options forfeited | $ / shares | 103.7 | 66.9 | 51.1
Weighted average exercise price, Options exercised | $ / shares | 48 | 50.9 | 51.5
Weighted average exercise price, Ending balance | $ / shares | 89.6 | 89.1 | 50.2
Weighted average exercise price, Options exercisable, end of year | $ / shares | $ 44.3 | $ 46.5 | $ 51.3
Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Fair value of options granted (NT$) | $ |  | $ 29.7 |
Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Fair value of options granted (NT$) | $ |  | $ 35.1 |

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