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Financial instruments - Fair values and risk management - Notional principal amounts (Details)
Mar. 31, 2025
EUR (€)
Mar. 31, 2025
£ / €
Mar. 31, 2025
$ / €
Mar. 31, 2024
EUR (€)
Mar. 31, 2024
£ / €
Mar. 31, 2024
$ / €
Mar. 31, 2023
EUR (€)
Mar. 31, 2023
£ / €
Mar. 31, 2023
$ / €
Disclosure of detailed information about financial instruments [line items]                  
Closing foreign exchange rate 1 0.8371 1.0817 1 0.8548 1.0793 1 0.8791 1.0839
Cash Flow Hedges                  
Disclosure of detailed information about financial instruments [line items]                  
Hedged exchange rate | $ / €     1.11            
Foriegn currency forward contracts                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount € 5,440,500,000     € 4,851,500,000     € 7,076,600,000    
Forward foreign exchange contracts - Within 1 Year                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount 4,299,300,000     4,403,600,000     5,873,100,000    
Forward foreign exchange contracts - Greater than 1 Year                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount € 1,141,200,000     € 447,900,000     € 1,203,500,000