Financial instruments - Fair values and risk management - Reclassified from OCI to capitalized cost (Details) - EUR (€) € in Millions	12 Months Ended
Mar. 31, 2021	Mar. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Recognized in property plant and equipment - aircraft additions	€ 5.0	€ 59.6
Aircraft purchases contract
Disclosure of detailed information about financial instruments [line items]
Recognized in property plant and equipment - aircraft additions	€ 5.0	€ 59.6

The amount removed from reserve of cash flow hedges and included in the initial cost or other carrying amount of a non-financial asset (liability) or a firm commitment for which fair value hedge accounting is applied. [Refer: Reserve of cash flow hedges]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 24E
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24E_a&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 9
-IssueDate 2020-01-01
-Paragraph 6.5.11
-Subparagraph d
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2020-en-r&anchor=para_6.5.11_d_i&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_AmountRemovedFromReserveOfCashFlowHedgesAndIncludedInInitialCostOrOtherCarryingAmountOfNonfinancialAssetLiabilityOrFirmCommitmentForWhichFairValueHedgeAccountingIsApplied
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration