Statutory and other information (Details) - EUR (€) € in Millions	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Disclosure of transactions between related parties [line items]
Share based compensation	€ 2.4	€ 3.7	€ 4.5
Total Directors' emoluments	6.6	11.3	13.4
Audit fees	0.6	0.7	0.5
Audit related fees	0.1
Tax advisory fees	0.1	0.2	0.2
Total fees	0.8	0.9	0.7
Operating lease charges, principally for aircraft	6.7	38.2	83.9
Parent company
Disclosure of transactions between related parties [line items]
Audit fees	1,000.0	1,000.0	1,000.0
Outside of Ireland
Disclosure of transactions between related parties [line items]
Audit fees	0.1	0.1	0.1
Tax advisory fees		0.1	0.1
Total fees	0.1	0.2	0.2
Owned
Disclosure of transactions between related parties [line items]
Depreciation of property, plant and equipment held under finance leases	496.5	683.5	633.4
Held under finance lease
Disclosure of transactions between related parties [line items]
Depreciation of property, plant and equipment held under finance leases	5.9	5.9	7.1
Director
Disclosure of transactions between related parties [line items]
Fees	0.5	0.6	0.7
Share based compensation	1.9	2.7	1.9
Other emoluments	0.3	0.9	1.8
Total Directors' emoluments	€ 2.7	€ 4.2	€ 4.4

The amount of fees paid or payable to the entity's auditors.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of fees paid or payable to the entity's auditors for auditing services.

+ References

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- Definition

The amount of fees paid or payable to the entity's auditors for services that the entity does not separately disclose in the same statement or note.

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The amount of fees paid or payable to the entity's auditors for tax services.

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- Definition

The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2020-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of compensation to key management personnel in the form of fees.

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No definition available.

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- Definition

The amount of compensation to key management personnel in the form of other emoluments, bonus and pension contributions.

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- Definition

The portion of operating lease payments that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with any amounts guaranteed by the lessee or by a party related to the lessee recognised as an expense.

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