v3.26.1
Share based payments - Schedule of parameters used in relation to the new grants (Details)
1 Months Ended
Jun. 30, 2026
$ / shares
Jun. 30, 2026
equityInstrument
$ / shares
Jun. 30, 2026
$ / shares
Jun. 30, 2026
$ / shares
Jun. 30, 2026
Y
$ / shares
Jun. 30, 2026
yr
$ / shares
Mar. 31, 2026
Y
equityInstrument
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of options granted (in shares) | equityInstrument   397,549         18,983
Share price (in USD per share)     $ 924.51        
Exercise price (in USD per share) $ 894.88 $ 894.88 894.88 $ 894.88 $ 894.88 $ 894.88 $ 704.83
Expected volatility (in percentage)       38.60%      
Expected dividend as percentage, share options granted       0.00%     0.00%
Belgian taxed beneficiaries              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of options granted (in shares) | equityInstrument   109,627          
Share options granted (as percent)       1      
Minimum              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Average fair value of options (in USD per share)     369.26       $ 250.03
Share price (in USD per share)             $ 713.80
Expected volatility (in percentage)             38.81%
Average expected option life (in years)         5.34 4.16 4.30
Risk-free interest rate       2.48%     2.48%
Minimum | Belgian taxed beneficiaries              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Time period for beneficiaries to choose contractual term 5 years            
Maximum              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Average fair value of options (in USD per share)     $ 401.72       $ 308.64
Share price (in USD per share)             $ 822.80
Expected volatility (in percentage)             39.99%
Average expected option life (in years)         6.36 6.36 6.50
Risk-free interest rate       2.52%     2.59%
Maximum | Belgian taxed beneficiaries              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Time period for beneficiaries to choose contractual term 10 years