Summary of significant accounting policies - Segment reporting (Details)	12 Months Ended
Jun. 30, 2021 segment
Segment reporting
Number of material segments	1

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	manu_IfrsNumberOfReportableSegments
Namespace Prefix:	manu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration