XML 121 R79.htm IDEA: XBRL DOCUMENT
v3.20.1

Capital management (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Text block [abstract] |
Summary of Group Monitors Capital using Liabilities to Assets Ratio | The liabilities to assets ratio at December 31, 2018 and 2019 were as follows:
|  | December 31, 2018 |  |  | December 31, 2019 |
|  | NT$000 |  |  | NT$000 |
Total liabilities |  |  | 15,112,545 |  |  |  | 14,775,302 |
Total assets |  |  | 33,133,718 |  |  |  | 34,305,887 |
Liabilities to assets ratio |  |  | 45.61% |  |  |  | 43.07% |

X
- Definition Liabilities to assets ratio explanatory. + References No definition available. + Details
Name: | imos_LiabilitiesToAssetsRatioExplanatory
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