v3.26.1
Financial instruments - Fair values and risk management - Notional principal amounts (Details)
Mar. 31, 2026
EUR (€)
Mar. 31, 2026
£ / €
Mar. 31, 2026
$ / €
Mar. 31, 2025
EUR (€)
Mar. 31, 2025
£ / €
Mar. 31, 2025
$ / €
Mar. 31, 2024
EUR (€)
Mar. 31, 2024
£ / €
Mar. 31, 2024
$ / €
Disclosure of detailed information about financial instruments [line items]                  
Closing foreign exchange rate 1 0.8732 1.1552 1 0.8371 1.0817 1 0.8548 1.0793
Foriegn currency forward contracts                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount € 7,823,900,000     € 5,440,500,000     € 4,851,500,000    
Foriegn currency forward contracts | Cash Flow Hedges                  
Disclosure of detailed information about financial instruments [line items]                  
Hedged exchange rate | $ / €     1.19            
Forward foreign exchange contracts - Within 1 Year                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount 4,095,700,000     4,299,300,000     4,403,600,000    
Forward foreign exchange contracts - Greater than 1 Year                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount € 3,728,200,000     € 1,141,200,000     € 447,900,000