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Financial Risk Management Objectives and Policies - Summary of Sensitivity Analysis of Foreign Currency Risk (Parenthetical) (Detail)	Dec. 31, 2020
Immatics GmbH [Member] | Euro weakens by 1 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	1.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	1.00%
Immatics GmbH [Member] | Euro strengths by 1 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	1.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	1.00%
Immatics GmbH [Member] | Euro weakens by 5 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	5.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	5.00%
Immatics GmbH [Member] | Euro strengths by 5 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	5.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	5.00%
Immatics GmbH [Member] | Euro weakens by 10 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	10.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	10.00%
Immatics GmbH [Member] | Euro strengths by 10 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	10.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	10.00%
Immatics N.V. [Member] | Euro weakens by 1 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	1.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	1.00%
Immatics N.V. [Member] | Euro strengths by 1 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	1.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	1.00%
Immatics N.V. [Member] | Euro weakens by 5 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	5.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	5.00%
Immatics N.V. [Member] | Euro strengths by 5 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	5.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	5.00%
Immatics N.V. [Member] | Euro weakens by 10 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	10.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	10.00%
Immatics N.V. [Member] | Euro strengths by 10 against US dollars [Member]
Disclosure of Sensitivity Analysis For Each Type Of Market Risk [Line Items]
Percentage Of Reasonably Possible Increase In Foreign Currency Risk	10.00%
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk	10.00%

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