XML 111 R88.htm IDEA: XBRL DOCUMENT
v3.21.1

Capital management (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Text block [abstract] |
Summary of Group Monitors Capital using Liabilities to Assets Ratio | The liabilities to assets ratio at December 31, 2019 and 2020 were as follows:
|  | December 31, 2019 |  |  | December 31, 2020 |
|  | NT$000 |  |  | NT$000 |
Total liabilities |  |  | 14,775,302 |  |  |  | 14,364,975 |
Total assets |  |  | 34,305,887 |  |  |  | 35,080,814 |
Liabilities to assets ratio |  |  | 43.07 | % |  |  | 40.95 | %

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