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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
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