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Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Statement [LineItems] |
Summary of Share Capital |
| a. | Share capital
Ordinary shares |  |  |
|  | December 31 |
|  | 2020 |  |  | 2021 |
Numbers of shares authorized (in thousands) |  |  | 5,500,000 |  |  |  | 5,500,000 |
Numbers of shares reserved (in thousands) |  |  |  |  |  |  |  |
Employee share options |  |  | 400,000 |  |  |  | 400,000 |
Number of shares issued and fully paid (in thousands) |  |  | 4,351,592 |  |  |  | 4,408,650 |
|  | December 31 |
|  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | US$ (Note 4) |
Share capital authorized |  | $ | 55,000,000 |  |  | $ | 55,000,000 |  |  | $ | 1,982,696 |
Share capital reserved |  |  |  |  |  |  |  |  |  |  |  |
Employee share options |  | $ | 4,000,000 |  |  | $ | 4,000,000 |  |  | $ | 144,196 |
American Depositary Receipts |  |  |  |  |  |  |  |
Summary of Capital Surplus |
| b. | Capital surplus
|  | December 31 |
|  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | US$ (Note 4) |
May be used to offset a deficit, distributed as cash dividends, or transferred to share capital (1) |  |  |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares |  | $ | 13,548,426 |  |  | $ | 16,049,286 |  |  | $ | 578,561 |
Merger by share exchange |  |  | 117,693,658 |  |  |  | 117,693,658 |  |  |  | 4,242,742 |
Difference between consideration and the carrying amount of the subsidiaries’ net assets during actual disposal or acquisition |  |  | 3,240,987 |  |  |  | 3,240,987 |  |  |  | 116,835 |
Exercised employee share options |  |  | 1,617,254 |  |  |  | 2,362,951 |  |  |  | 85,182 |
Treasury share transactions |  |  | 510,449 |  |  |  | 816,186 |  |  |  | 29,422 |
Expired share options (Note 28) |  |  | 645,903 |  |  |  | 645,903 |  |  |  | 23,284 |
|  |  | 137,256,677 |  |  |  | 140,808,971 |  |  |  | 5,076,026 |
May be used to offset a deficit only |  |  |  |  |  |  |  |  |  |  |  |
Changes in percentage of ownership interest in subsidiaries (2) |  |  | 1,451 |  |  |  | 1,451 |  |  |  | 52 |
Share of changes in capital surplus of associates |  |  | 41,239 |  |  |  | 10,706 |  |  |  | 386 |
Dividends that the claim period has elapsed and unclaimed by shareholders |  |  | 3,550 |  |  |  | 5,183 |  |  |  | 187 |
|  |  | 46,240 |  |  |  | 17,340 |  |  |  | 625 |
May not be used for any purpose |  |  |  |  |  |  |  |  |  |  |  |
Employee share options |  |  | 1,894,952 |  |  |  | 1,442,132 |  |  |  | 51,988 |
Employee restricted stock awards |  |  | — |  |  |  | 1,193,782 |  |  |  | 43,034 |
Others (3) |  |  | 569,681 |  |  |  | 230,943 |  |  |  | 8,326 |
|  |  | 2,464,633 |  |  |  | 2,866,857 |  |  |  | 103,348 |
|  | $ | 139,767,550 |  |  | $ | 143,693,168 |  |  | $ | 5,179,999 |
| 1) | Such capital surplus may be used to offset a deficit; in addition, when the Company has no deficit, such capital surplus may be distributed as cash dividends or transferred to share capital (limited to a certain percentage of the Company’s capital surplus and once a year).
| 2) | Such capital surplus arises from the effects of changes in ownership interests in subsidiaries resulting from equity transactions other than actual disposals or acquisitions, or from changes in capital surplus of subsidiaries accounted for using the equity method.
| 3) | Such capital surplus represents the excess of the carrying amount of related accounts over the par value due to employee share options exercised and the Company has not completed registration formalities.
Disclosure of Detailed Information About Appropriation of Retained Earnings Explanatory | The appropriation of earnings for 2019 and 2020 resolved in the Company’s annual shareholders’ meetings in June 2020 and August 2021, respectively , were as follows:
|  | Appropriation of Earnings |  |  | Dividends Per Share |
|  | For Year 2019 |  |  | For Year 2020 |  |  | For Year 2019 |  |  | For Year 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  |  |  | (in dollars) |  |  | (in dollars) |
Legal reserve |  | $ | 1,697,489 |  |  | $ | 2,398,814 |  |  |  |  |  |  |  |  |
Special reserve (reverse) |  |  | 3,944,915 |  |  |  | (1,278,670 | ) |  |  |  |  |  |  |  |
Cash dividends |  |  | 8,668,331 |  |  |  | 18,389,856 |  |  | $ | 2.0 |  |  | $ | 4.2 |
|  | $ | 14,310,735 |  |  | $ | 19,510,000 |  |  |  |  |  |  |  |  |
Summary of Unrealized Gain (Loss) on Financial Assets at FVTOCI |
| 2) | Unr e alized gain (loss) on financial assets at FVTOCI
|  | For the Year Ended December 31 |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | US$ (Note 4) |
Balance at January 1 |  | $ | (1,015,107 | ) |  | $ | (203,098 | ) |  | $ | 2,027,902 |  |  | $ | 73,104 |
Unrealized gain (loss) recognized during the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instruments |  |  | (2,052 | ) |  |  | (2,136 | ) |  |  | 63,722 |  |  |  | 2,297 |
Equity instruments |  |  | (283,472 | ) |  |  | (405,020 | ) |  |  | (8,671 | ) |  |  | (313 | )
Share from associates and joint venture accounted for using the equity method |  |  | 1,501,689 |  |  |  | 2,655,570 |  |  |  | 3,599,703 |  |  |  | 129,766 |
Realized gain (loss) recognized during the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of associates and joint venture accounted for using the equity method |  |  | — |  |  |  | 1,094 |  |  |  | — |  |  |  | — |
Cumulative unrealized loss of equity instruments transferred to retained earnings due to disposal |  |  | — |  |  |  | 16,383 |  |  |  | 33,258 |  |  |  | 1,199 |
Cumulative unrealized loss transferred to retained earnings due to disposal of equity instruments in relation to associates and joint venture accounted for using the equity method |  |  | (404,156 | ) |  |  | (34,891 | ) |  |  | (1,525,553 | ) |  |  | (54,995 | )
Balance at December 31 |  | $ | (203,098 | ) |  | $ | 2,027,902 |  |  | $ | 4,190,361 |  |  | $ | 151,058 |
Schedule of detailed information about hedges of net investments of foreign operations |
| 3) | Gain (loss) on hedging instruments - hedges of net investments of foreign operations
|  | For the Year Ended December 31 |
|  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | US$ (Note 4) |
Balance at January 1 |  | $ | — |  |  | $ | (429,265 | ) |  | $ | (15,475 | )
Recognized during the year |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency risk – loans denominated in foreign currency |  |  | (429,265 | ) |  |  | 551,098 |  |  |  | 19,867 |
Balance at December 31 |  | $ | (429,265 | ) |  | $ | 121,833 |  |  | $ | 4,392 |
Summary of Unearned Employee Compensation | In August 2021, the shareholders’ meeting resolved to issue restricted stock awards for employees . R efer to Note 28 for the information.
|  | For the Year Ended December 31, 2021 |
|  | NT$ |  |  | US$ (Note 4) |
Balance at January 1 |  | $ | — |  |  | $ | — |
Issuance of employee restricted stock awards |  |  | (1,343,782 | ) |  |  | (48,442 | )
Share-based payment expenses |  |  | 178,791 |  |  |  | 6,446 |
Balance at December 31 |  | $ | (1,164,991 | ) |  | $ | (41,996 | )
Summary of Treasury Shares |
| e. | Treasury shares (in thousand shares)
Purpose of Repurchase |  | Shares repurchased for cancellation |  |  | Shares held by subsidiaries |  |  | Total |
Balance at December 31, 2020 |  |  | — |  |  |  | 72,941 |  |  |  | 72,941 |
Balance at January 1, 2021 |  |  | — |  |  |  | 72,941 |  |  |  | 72,941 |
Addition |  |  | 53,067 |  |  |  | — |  |  |  | 53,067 |
Balance at December 31, 2021 |  |  | 53,067 |  |  |  | 72,941 |  |  |  | 126,008 |
Summary of Shares Held By Subsidiaries | The Company’s shares held by its subsidiaries at each balance sheet date were as follows:
|  | Shares Held by Subsidiaries |  |  | Carrying Amount |  |  | Carrying Amount |  |  | Fair Value |  |  | Fair Value |
|  | (in thousand shares) |  |  | NT$ |  |  | US$ (Note 4) |  |  | NT$ |  |  | US$ (Note 4) |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ASE Test |  |  | 44,100 |  |  | $ | 1,380,721 |  |  |  |  |  |  | $ | 3,585,349 |  |  |  |  |
J&R Holding |  |  | 23,352 |  |  |  | 381,709 |  |  |  |  |  |  |  | 1,898,508 |  |  |  |  |
ASE Test, Inc. |  |  | 5,489 |  |  |  | 196,677 |  |  |  |  |  |  |  | 446,287 |  |  |  |  |
|  |  | 72,941 |  |  | $ | 1,959,107 |  |  |  |  |  |  | $ | 5,930,144 |  |  |  |  |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ASE Test |  |  | 44,100 |  |  | $ | 1,380,721 |  |  | $ | 49,774 |  |  | $ | 4,696,675 |  |  | $ | 169,311 |
J&R Holding |  |  | 23,352 |  |  |  | 381,709 |  |  |  | 13,760 |  |  |  | 2,486,975 |  |  |  | 89,653 |
ASE Test, Inc. |  |  | 5,489 |  |  |  | 196,677 |  |  |  | 7,090 |  |  |  | 584,620 |  |  |  | 21,075 |
|  |  | 72,941 |  |  | $ | 1,959,107 |  |  | $ | 70,624 |  |  | $ | 7,768,270 |  |  | $ | 280,039 |
Summary of Non-controlling Interests |
| f. | Non-controlling interests
|  | For the Year Ended December 31 |
|  | 2019 |  |  | 2020 (retrospectively adjusted) |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | US$ (Note 4) |
Balance at January 1 (retrospectively adjusted) |  | $ | 17,639,487 |  |  | $ | 13,374,912 |  |  | $ | 15,622,009 |  |  | $ | 563,158 |
Share of profit for the year |  |  | 1,207,974 |  |  |  | 1,681,320 |  |  |  | 2,099,830 |  |  |  | 75,697 |
Other comprehensive income (loss) for the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange difference on translating foreign operations |  |  | (414,010 | ) |  |  | 178,480 |  |  |  | (321,551 | ) |  |  | (11,592 | )
Unrealized gain (loss) on equity instruments at FVTOCI |  |  | (10,773 | ) |  |  | 1,321 |  |  |  | 50,679 |  |  |  | 1,827 |
Gain (loss) from hedging |  |  | — |  |  |  | (145,559 | ) |  |  | 187,502 |  |  |  | 6,759 |
Remeasurement on defined benefit plans |  |  | (7,422 | ) |  |  | (9,075 | ) |  |  | 1,497 |  |  |  | 54 |
Share of other comprehensive income from associates accounted for using the equity method |  |  | — |  |  |  | — |  |  |  | 7,902 |  |  |  | 285 |
Non-controlling interests arising from acquisition or disposal of subsidiaries (Note 29) |  |  | 666,651 |  |  |  | 298 |  |  |  | — |  |  |  | — |
Acquisition of non-controlling interests in subsidiaries (Note 31) |  |  | (5,084,785 | ) |  |  | (116,738 | ) |  |  | — |  |  |  | — |
Issuance of ordinary shares by subsidiaries (Note 29) |  |  | 83,044 |  |  |  | 1,711,453 |  |  |  | — |  |  |  | — |
Subsidiaries’ buy back of their own outstanding ordinary shares (Note 31) |  |  | (2,017,319 | ) |  |  | (2,299,533 | ) |  |  | (2,748,521 | ) |  |  | (99,081 | )
Equity component of convertible bonds issued by subsidiaries |  |  | — |  |  |  | — |  |  |  | 393,199 |  |  |  | 14,174 |
Non-controlling interest relating to outstanding vested employee share options granted by subsidiaries |  |  | 1,672,310 |  |  |  | 1,591,904 |  |  |  | 314,398 |  |  |  | 11,334 |
Cash dividends d ist ri buted to non-controlling interests |  |  | (360,245 | ) |  |  | (346,774 | ) |  |  | (1,062,529 | ) |  |  | (38,303 | )
Balance at December 31 |  | $ | 13,374,912 |  |  | $ | 15,622,009 |  |  | $ | 14,544,415 |  |  | $ | 524,312 |
Exchange differences on translating foreign operations [member] |
Statement [LineItems] |
Summary of Other Reserves |
| 1) | Exchange differences on translating foreign operations
|  | For the Year Ended December 31 |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | US$ (Note 4) |
Balance at January 1 |  | $ | (5,888,574 | ) |  | $ | (10,762,684 | ) |  | $ | (11,641,939 | ) |  | $ | (419,681 | )
Recognized for the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange differences a ri si ng on translating foreign operations |  |  | (4,788,135 | ) |  |  | (1,173,204 | ) |  |  | (3,203,730 | ) |  |  | (115,491 | )
Share from associates and joint venture accounted for using the equity method |  |  | (85,975 | ) |  |  | 101,038 |  |  |  | 21,307 |  |  |  | 768 |
Reclassification |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of associates and joint venture accounted for using the equity method |  |  | — |  |  |  | 29,971 |  |  |  | — |  |  |  | — |
Disposal of foreign operations |  |  | — |  |  |  | 162,940 |  |  |  | (569,284 | ) |  |  | (20,522 | )
Balance at December 31 |  | $ | (10,762,684 | ) |  | $ | (11,641,939 | ) |  | $ | (15,393,646 | ) |  | $ | (554,926 | )

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