Non-controlling interests - Narrative (Details) - EUR (€) € in Millions	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Interests In Other Entities [Abstract]
Dividends paid to non-controlling interests	€ 0.2	€ 4.8	€ 3.9

The amount of dividends paid to non-controlling interests. [Refer: Non-controlling interests]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2020-01-01
-Paragraph B10
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B10_a&doctype=Appendix&subtype=B
-URIDate 2020-01-01

Name:	ifrs-full_DividendsPaidToNoncontrollingInterests
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration