The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

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Financial instruments - Fair values and risk management - Currency risk (Details) £ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2025 EUR (€)	Mar. 31, 2024 EUR (€)	Mar. 31, 2023 EUR (€)	Mar. 31, 2022 EUR (€)	Mar. 31, 2022 USD ($)	Mar. 31, 2025 GBP (£)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 £ / €	Mar. 31, 2025 $ / €	Mar. 31, 2024 GBP (£)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 £ / €	Mar. 31, 2024 $ / €	Mar. 31, 2023 GBP (£)	Mar. 31, 2023 USD ($)	Mar. 31, 2023 £ / €	Mar. 31, 2023 $ / €
Disclosure of detailed information about financial instruments [line items]
Exchange rate	1	1	1					0.8371	1.0817			0.8548	1.0793			0.8791	1.0839
Promissory notes maturing October 2023
Disclosure of detailed information about financial instruments [line items]
Proceeds from issue of notes				€ 230,000,000	$ 250.0
Foreign currency risk \| Cash Flow Hedges
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on hedge ineffectiveness	€ 0	€ 0	€ 0
Monetary liabilities \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure	198,800,000		876,500,000
Monetary liabilities \| United States of America, Dollars \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure \| $							$ 215.0								$ 950.0
Non-current maturities of debt \| United States of America, Dollars \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure			259,100,000												280.8
Pre-delivery payments due to aircraft manufacturer, Boeing \| United States of America, Dollars \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure	198,800,000		617,400,000				215.0								669.2
Cash and liquid resources \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure	790,000,000	792,900,000	708,100,000
Cash and liquid resources \| United States of America, Dollars \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure	681,900,000	727,800,000	619,300,000				$ 737.6				$ 785.5				$ 671.3
Cash and liquid resources \| United Kingdom, Pounds \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure	€ 108,100,000	€ 65,100,000	€ 88,800,000			£ 90.5				£ 55.6				£ 78.1