XML 165 R50.htm IDEA: XBRL DOCUMENT
v3.20.1

Other operating income (expenses), net (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Text block [abstract] |
Summary of Other Operating Income (Expenses), Net |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$000 |  |  | NT$000 |  |  | NT$000 |
Gain on disposal of property, plant and equipment, net |  |  | 132,777 |  |  |  | 14,274 |  |  |  | 20,271 |
Impairment loss on property, plant and equipment |  |  | (956 | ) |  |  | — |  |  |  | (9,938 | )
Gain on disposal of scrapped materials |  |  | 27,940 |  |  |  | 59,380 |  |  |  | 43,652 |
Gain on disposal of items purchased on behalf of others |  |  | 26,417 |  |  |  | 31,268 |  |  |  | 15,080 |
Royalty income |  |  | 11,998 |  |  |  | 43,224 |  |  |  | 12,336 |
Insurance compensation income |  |  | 486,858 |  |  |  | 147 |  |  |  | 10,435 |
Others |  |  | 7,800 |  |  |  | (779 | ) |  |  | 1,092 |
|  |  | 692,834 |  |  |  | 147,514 |  |  |  | 92,928 |

X
- Definition Disclosure of detailed information about operating other operating income expenses. + References No definition available. + Details
Name: | imos_DisclosureOfDetailedInformationAboutOtherOperatingIncomeExpensesExplanatory
Namespace Prefix: | imos_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Text block [abstract] + References No definition available. + Details
Name: | imos_TextBlockAbstract
Namespace Prefix: | imos_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration