v3.24.1
Share-based Payment Arrangements - Summary of Information About ASE Inc. Option Plans (Detail)
 1 Months Ended 12 Months Ended
Nov. 30, 2019
shares
Dec. 31, 2023
TWD ($)
shares
$ / shares
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2021
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Options granted 17,167,000      
The Company Option Plans [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Number of options, beginning balance   81,262,000 96,802,000 144,767,000
Options granted   150,000,000 0 0
Number of options, forfeited   (1,471,000) (1,206,000) (5,907,000)
Number of options, exercised   (17,551,000) (14,334,000) (42,058,000)
Number of options, Ending balance   212,240,000 81,262,000 96,802,000
Number of options, exercisable, end of year   62,505,000 58,216,000 49,696,000
Weighted-average fair value of options granted (NT$)     0 0
Weighted average exercise price, Beginning balance | $ / shares   $ 50.2 $ 53.3 $ 56.9
Options granted | $ / shares   107 0 0
Weighted average exercise price, Options forfeited | $ / shares   66.9 51.1 52.3
Weighted average exercise price, Options exercised | $ / shares   50.9 51.5 61.4
Weighted average exercise price, Ending balance | $ / shares   89.1 50.2 53.3
Weighted average exercise price, Options exercisable, end of year | $ / shares   $ 46.5 $ 51.3 $ 55.5
The Company Option Plans [member] | Bottom of range [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Fair value of options granted (NT$) | $   $ 29.7    
The Company Option Plans [member] | Top of range [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Fair value of options granted (NT$) | $   $ 35.1