Financial Risk Management - Schedule of Marketable Securities Specified By Investment Grade Credit Rating (Detail) - EUR (€) € in Thousands	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Line Items]
Financial assets	€ 439,222	€ 758,741
Financial assets at amortised cost, class [member]
Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Line Items]
Financial marketable securities	7,275	298,180
Financial assets at fair value, class [member]
Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Line Items]
Financial marketable securities	7,266	295,843
Credit risk [member] \| Financial assets at amortised cost, class [member]
Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Line Items]
Financial assets	7,275
Financial marketable securities		298,180
Credit risk [member] \| Financial assets at fair value, class [member]
Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Line Items]
Financial assets	7,266
Financial marketable securities		295,843
Credit risk [member] \| High Grade [Member] \| Financial assets at amortised cost, class [member]
Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Line Items]
Financial assets	4,523	203,530
Credit risk [member] \| High Grade [Member] \| Financial assets at fair value, class [member]
Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Line Items]
Financial assets	4,519	202,048
Credit risk [member] \| Upper Medium Grade [Member] \| Financial assets at amortised cost, class [member]
Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Line Items]
Financial assets	2,752	94,650
Credit risk [member] \| Upper Medium Grade [Member] \| Financial assets at fair value, class [member]
Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Line Items]
Financial assets	€ 2,747	€ 93,795

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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