Employee benefit obligations - Narrative (Details) - EUR (€) € in Millions	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Disclosure of defined benefit plans [line items]
Expected post-employment benefit expense (credit)	€ 1.8	€ 1.2
Post-employment defined benefit plan
Disclosure of defined benefit plans [line items]
Contributions by employer	€ 0.7	€ 0.7

The amount of employer contributions to retirement benefit plans.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 26
-IssueDate 2023-01-01
-Paragraph 35
-Subparagraph b
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2023-en-r&anchor=para_35_b_i&doctype=Standard
-URIDate 2023-03-23

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