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Other reserve (Tables) | 12 Months Ended
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Dec. 31, 2019
Other reserves [abstract] |
Summary of Other Reserve |
|  | 2017 |
|  | Foreign currency translation reserve |  |  | Amounts recognized in other comprehensive income (loss) and accumulated in equity relating to non-current assets held for sale |  |  | Unrealized gain on valuation of available-for-sale financial assets |  |  | Unearned employee awards |  |  | Total |
|  | NT$000 |  |  | NT$000 |  |  | NT$000 |  |  | NT$000 |  |  | NT$000 |
January 1 |  |  | 10,600 |  |  |  | 287,645 |  |  |  | — |  |  |  | (200,204 | ) |  |  | 98,041 |
Currency translation differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- The Company |  |  | (232,652 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (232,652 | )
- Disposal of a subsidiary |  |  | 287,645 |  |  |  | (287,645 | ) |  |  | — |  |  |  | — |  |  |  | — |
Employee restricted shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- The Company |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 145,634 |  |  |  | 145,634 |
Evaluation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Associates |  |  | — |  |  |  | — |  |  |  | 678 |  |  |  | — |  |  |  | 678 |
December 31 |  |  | 65,593 |  |  |  | — |  |  |  | 678 |  |  |  | (54,570 | ) |  |  | 11,701 |
|  | 2018 |
|  | Foreign currency translation reserve |  |  | Unrealized gain (loss) on valuation of financial assets at fair value through other comprehensive income |  |  | Unrealized gain on valuation of available-for-sale financial assets |  |  | Unearned employee awards |  |  | Total |
|  | NT$000 |  |  | NT$000 |  |  | NT$000 |  |  | NT$000 |  |  | NT$000 |
January 1 |  |  | 65,593 |  |  |  | — |  |  |  | 678 |  |  |  | (54,570 | ) |  |  | 11,701 |
Effects on initial application of IFRS 9 |  |  | — |  |  |  | 42,843 |  |  |  | (678 | ) |  |  | — |  |  |  | 42,165 |
Adjusted beginning balance |  |  | 65,593 |  |  |  | 42,843 |  |  |  | — |  |  |  | (54,570 | ) |  |  | 53,866 |
Currency translation differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- The Company |  |  | (51,077 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (51,077 | )
Employee restricted shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- The Company |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 52,869 |  |  |  | 52,869 |
Evaluation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- The Company |  |  | — |  |  |  | 85,022 |  |  |  | — |  |  |  | — |  |  |  | 85,022 |
- Associates |  |  | — |  |  |  | (2,438 | ) |  |  | — |  |  |  | — |  |  |  | (2,438 | )
Evaluation adjustment related tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- The Company |  |  | — |  |  |  | (18,529 | ) |  |  | — |  |  |  | — |  |  |  | (18,529 | )
December 31 |  |  | 14,516 |  |  |  | 106,898 |  |  |  | — |  |  |  | (1,701 | ) |  |  | 119,713 |
|  | 2019 |
|  | Foreign currency translation reserve |  |  | Unrealized gain (loss) on valuation of financial assets at fair value through other comprehensive income |  |  | Unearned employee awards |  |  | Total |
|  | NT$000 |  |  | NT$000 |  |  | NT$000 |  |  | NT$000 |
January 1 |  |  | 14,516 |  |  |  | 106,898 |  |  |  | (1,701 | ) |  |  | 119,713 |
Currency translation differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- The Company |  |  | (104,198 | ) |  |  | — |  |  |  | — |  |  |  | (104,198 | )
Employee restricted shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- The Company |  |  | — |  |  |  | — |  |  |  | 1,701 |  |  |  | 1,701 |
Evaluation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- The Company |  |  | — |  |  |  | (52,549 | ) |  |  | — |  |  |  | (52,549 | )
- Associates |  |  | — |  |  |  | 5,093 |  |  |  | — |  |  |  | 5,093 |
Evaluation adjustment related tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- The Company |  |  | — |  |  |  | 7,016 |  |  |  | — |  |  |  | 7,016 |
Disposal of investment in associates |  |  | — |  |  |  | (72 | ) |  |  | — |  |  |  | (72 | )
December 31 |  |  | (89,682 | ) |  |  | 66,386 |  |  |  | — |  |  |  | (23,296 | )

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Summary of other reserve. + References No definition available. + Details
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Namespace Prefix: | imos_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration