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Financial instruments - fair values and risk management - Additional Information (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
Disclosure of detailed information about financial instruments      
Financial assets, Carrying amount € 136,521 € 127,164  
Percentage of sales in functional currency 71.00%    
Accumulated impairment [member]      
Disclosure of detailed information about financial instruments      
Financial assets, Carrying amount € (14,300) (14,300)  
Contract assets      
Disclosure of detailed information about financial instruments      
Contract assets Gross Carrying Amount 61,200 50,600  
Contract assets | Accumulated impairment [member]      
Disclosure of detailed information about financial instruments      
Impairment loss allowance (400) (100)  
Facility B | Senior Facilities Agreement [Member] | Stated Interest Of At least Zero Percent Or If Less Than Zero Percent Then Interest Rate Spread Of Three Point Five Percentage Points [Member]      
Disclosure of detailed information about financial instruments      
Estimated interest expense for the forthcoming year 1,800    
RCF      
Disclosure of detailed information about financial instruments      
Undrawn borrowing facilities 220,000 220,000  
Future annual interest expense 1,840 € 1,840  
RCF | Senior Facilities Agreement [Member]      
Disclosure of detailed information about financial instruments      
Line of credit maximum borrowing capacity € 220,000    
Less Than or Equal to Three | RCF      
Disclosure of detailed information about financial instruments      
Leverage ratio 3.00 3.00  
Less Than or Equal to Three | RCF | Senior Facilities Agreement [Member]      
Disclosure of detailed information about financial instruments      
Leverage ratio 3.00    
Not Designated As Cash Flow Hedging Instruments [Member] | Forward contract | Currency risk | US Dollars      
Disclosure of detailed information about financial instruments      
Foreign currency exposure net liability asset € 614,000 € 35,100  
Not Designated As Cash Flow Hedging Instruments [Member] | Forward contract | Currency risk | Great Britain Pounds      
Disclosure of detailed information about financial instruments      
Foreign currency exposure net liability asset € 109,000 € 49,300  
No Customer      
Disclosure of detailed information about financial instruments      
Concentration of revenue percentage 10.00% 10.00% 10.00%