Share-based payments - Employee Share Plan (Details)	12 Months Ended
Jun. 30, 2024 tranche
Employee Share Plan [Abstract]
Number of tranches	3
Maximum
Employee Share Plan [Abstract]
Term of limited recourse loan	9 years 11 months

The term of limited resource loan issued by an entity, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	iren_TermOfLimitedResourceLoan
Namespace Prefix:	iren_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration