XML 58 R35.htm IDEA: XBRL DOCUMENT
v3.21.1

Expenses by nature | 12 Months Ended
--- | ---
Dec. 31, 2020
Text block [abstract] |
Expenses by nature |
30. | Expenses by nature
|  | Year ended December 31, |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$000 |  |  | NT$000 |  |  | NT$000 |
Raw materials and supplies used |  |  | 3,079,909 |  |  |  | 3,575,283 |  |  |  | 4,708,493 |
Employee benefit expenses |  |  | 5,606,833 |  |  |  | 6,075,773 |  |  |  | 6,010,227 |
Depreciation expenses |  |  | 3,376,579 |  |  |  | 3,731,914 |  |  |  | 4,175,519 |
Others |  |  | 4,464,499 |  |  |  | 4,590,720 |  |  |  | 4,686,218 |
|  |  | 16,527,820 |  |  |  | 17,973,690 |  |  |  | 19,580,457 |

X
- Definition Disclosure of classification of expenses. + References No definition available. + Details
Name: | imos_DisclosureOfClassificationOfExpensesTextBlock
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