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Share-Based Compensation - Additional Information (Details) |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |
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Sep. 28, 2020 USD ($) | Sep. 25, 2020 $ / shares shares | Aug. 11, 2020 $ / shares shares | Mar. 31, 2020 $ / shares shares | Sep. 23, 2019 shares | Sep. 26, 2018 USD ($) | Sep. 29, 2017 USD ($) | Sep. 28, 2016 USD ($) | Jan. 01, 2016 | Jan. 01, 2016 TWD ($) | Jan. 01, 2016 | Oct. 06, 2015 $ / shares shares | Oct. 06, 2015 $ / shares shares | Sep. 25, 2015 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation No Of Shares Authorized | shares |  |  |  |  |  |  |  |  |  |  |  | 2,528,000 | 2,528,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price, share options granted | (per share) |  |  |  |  |  |  |  |  |  |  |  | $ 65 | $ 1.986 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, Granted | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.05 | $ 2.27 |  |  |  |  |  |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000 | $ 5,000 |  | $ 22,000 |  |  |  |  |  |  |  |  |
Estimated fairvalue market price of ADS | $ 3.44 |  |  |  |  | $ 5.76 | $ 10.93 | $ 8.30 |  |  |  |  |  | $ 7.92 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit settle by shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,302 | 77,756 | 82,814 | 82,814 |  |  |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 163,500 | 2,226,690 |  |  |  |  |  |  |  |  |  |  |
Number of share options exercised in share-based payment arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,574,869) |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of outstanding share options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months 15 days | 1 year 6 months |  |  |  |  |  |  |  |  |  |  |
Compensation Cost Not Yet Recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 89,000 |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
percentage of vested settled by ordinary shares One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.44 |  | 0.95 | 1.03 | 2.69 |
percentage of vested settled by ordinary shares Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.44 |  | 0.95 | 1.03 | 2.69 |  |
percentage of vested settled by ordinary shares Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.44 |  | 0.95 | 1.03 | 2.69 |  |  |
Restricted stock units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share-based payment arrangement | 1,402,714 |  |  |  |  | 676,273 | 580,235 | 1,208,785 |  |  |  |  |  | 597,596 | 1,402,714 |  |  | 676,273 |  |  |  |  |  |  |  |  |
Percentage of restrictedstock units grant vested | 98.68 |  |  |  |  | 97.15 | 96.91 | 91.93 |  |  |  |  |  | 94.15 |  |  |  |  |  |  |  |  |  |  |  |  |
percentage of vested settled by ordinary shares One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.95
percentage of vested settled by ordinary shares Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.95 |
percentage of vested settled by ordinary shares Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.95 |  |
Weighted average remaining contractual life of outstanding share options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 4 months 13 days |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units settled by cash | $ 4,762,000 |  |  |  |  | $ 3,778,000 | $ 6,147,000 | $ 9,223,000 |  |  |  |  |  | $ 4,456,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Himax Imaging [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement |  |  |  |  |  |  |  |  |  |  | 1,760,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share options exercised in share-based payment arrangement |  |  |  |  |  |  |  |  |  | 30 | 0.9139 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Imaging Taiwan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, Granted | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0000 |  | $ 0.0000 |  |  |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Number of share options exercised in share-based payment arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of outstanding share options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 years | 0 years |  | 1 year | 2 years |  |  |  |  |  |  |  |
Stock Option 2016 Plan [Member] | Himax Imaging [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Options Contractual Life |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Options Vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan [Member] | Himax Imaging [Member] | One And Half Years After Grant Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan [Member] | Himax Imaging [Member] | Three Years After Grant Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan [Member] | Himax Imaging [Member] | ROC Centarl Government [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Risk Free Interest Rate Expected Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan [Member] | Himax Imaging [Member] | ROC Centarl Government [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Risk Free Interest Rate Expected Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan [Member] | Imaging Taiwan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Options Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Share Based Compensation No Of Shares Authorized | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,040,000 | 2,040,000 |  |  |  |  |  |  |  |  |
Exercise price, share options granted | (per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30 | $ 0.9139 |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan [Member] | Imaging Taiwan [Member] | One And Half Years After Grant Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan [Member] | Imaging Taiwan [Member] | Three Years After Grant Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan [Member] | Imaging Taiwan [Member] | ROC Centarl Government [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Risk Free Interest Rate Expected Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan [Member] | Imaging Taiwan [Member] | ROC Centarl Government [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Risk Free Interest Rate Expected Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2015 Plan [Member] | Himax Display [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Options Contractual Life |  |  |  |  |  |  |  |  |  |  |  | 4 years | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Options Vesting period |  |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expense from share-based payment transactions for non controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 115,000 |  |  |  |  |  |  |  |  |
Stock Option 2015 Plan [Member] | Himax Display [Member] | One And Half Years After Grant Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2015 Plan [Member] | Himax Display [Member] | Three Years After Grant Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2015 Plan [Member] | Himax Display [Member] | ROC Centarl Government [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Risk Free Interest Rate Expected Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2015 Plan [Member] | Himax Display [Member] | ROC Centarl Government [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Risk Free Interest Rate Expected Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2019 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Options Contractual Life |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Risk Free Interest Rate Expected Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 1 year 6 months |  |  |  |  |  |  |  |  |  |  |
Number of ADS authorized | shares |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of ADS per stock options granted | shares |  | 10,000 | 39,000 | 114,500 | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, Granted | $ / shares |  | $ 3.35 | $ 3.90 | $ 2.74 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 570,000 | $ 326,000 |  |  |  |  |  |  |  |  |  |  |
Income tax benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103,000 | $ 59,000 |  |  |  |  |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement |  | 10,000 | 39,000 | 114,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2019 Plan [Member] | One And Half Years After Grant Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2019 Plan [Member] | Three Years After Grant Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 122,000 |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The decrease (increase) in equity resulting from tax on transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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