Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Fair value measurement - Summary of Valuation Inputs To The Fair Value of Purchase Options (Detail)

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Fair value measurement - Summary of Valuation Inputs To The Fair Value of Purchase Options (Detail)
Dec. 31, 2023
Dec. 31, 2022
Dec. 15, 2022
EUR (€)
Jun. 07, 2022
EUR (€)
Mar. 16, 2022
EUR (€)
Spot price per share          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets     108 115  
Spot price per share | Purchase options | Mega-E          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets         437,000
Spot price per share | MOMA | Purchase options          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets       253  
Volatility          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets     0.2750 0.2750  
Volatility | Purchase options | Mega-E          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets         1.0000
Growth factor | Investments in equity securities          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets 0.020 0.030      
Discount rate | Investments in equity securities          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets 0.103 0.119      
Discount rate | Bottom of range          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets     0.023 (0.001)  
Discount rate | Top of range          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets     0.025 0.007  
Electricity Forward Price, Measurement Input | Derivatives          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets 69     78  
Electricity Forward Price, Measurement Input | Bottom of range | Derivatives          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets 83     90  
Electricity Forward Price, Measurement Input | Top of range | Derivatives          
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]          
Unobservable input, assets 91     128