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Financial Risk Management Objectives and Policies - Summary of Sensitivity Analysis of Foreign Currency Risk (Detail) € in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 EUR (€) | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 0.8149 | 0.8902 | 0.8738
Euro weakens by 1% against U.S. dollars [Member] | Immatics GmbH [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.2394 |  |
Profit/(loss) | € (757) |  |
Carrying amount | € 75,706 |  |
Euro weakens by 1% against U.S. dollars [Member] | Immatics N.V. [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.2394 |  |
Profit/(loss) | € (421) |  |
Carrying amount | € 42,107 |  |
Euro strengths by 1% against U.S. dollars [Member] | Immatics GmbH [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.2148 |  |
Profit/(loss) | € 772 |  |
Carrying amount | € 77,235 |  |
Euro strengths by 1% against U.S. dollars [Member] | Immatics N.V. [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.2148 |  |
Profit/(loss) | € 430 |  |
Carrying amount | € 42,958 |  |
Euro weakens by 5% against U.S. dollars [Member] | Immatics GmbH [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.2885 |  |
Profit/(loss) | € (3,641) |  |
Carrying amount | € 72,822 |  |
Euro weakens by 5% against U.S. dollars [Member] | Immatics N.V. [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.2885 |  |
Profit/(loss) | € (2,025) |  |
Carrying amount | € 40,503 |  |
Euro strengths by 5% against U.S. dollars [Member] | Immatics GmbH [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.1657 |  |
Profit/(loss) | € 4,024 |  |
Carrying amount | € 80,487 |  |
Euro strengths by 5% against U.S. dollars [Member] | Immatics N.V. [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.1657 |  |
Profit/(loss) | € 2,238 |  |
Carrying amount | € 44,766 |  |
Euro weakens by 10% against U.S. dollars [Member] | Immatics GmbH [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.3498 |  |
Profit/(loss) | € (6,951) |  |
Carrying amount | € 69,512 |  |
Euro weakens by 10% against U.S. dollars [Member] | Immatics N.V. [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.3498 |  |
Profit/(loss) | € (3,866) |  |
Carrying amount | € 38,662 |  |
Euro strengths by 10% against U.S. dollars [Member] | Immatics GmbH [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.1044 |  |
Profit/(loss) | € 8,496 |  |
Carrying amount | € 84,959 |  |
Euro strengths by 10% against U.S. dollars [Member] | Immatics N.V. [Member] |  |  |
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items] |  |  |
Conversion rate | 1.1044 |  |
Profit/(loss) | € 4,725 |  |
Carrying amount | € 47,253 |  |

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