Income tax expense, Unrecognized Deferred Tax Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Unrecognized deferred tax assets [Abstract]
Available tax losses	$ 19,268	$ 7,239	$ 4,065
Tax effect at the applicable tax rate for each jurisdiction	5,117	1,887	1,021
Deferred tax asset on tax losses recognized to the extent of taxable temporary differences	3,854	798	649
Deferred tax asset on losses not recognized	$ 1,263	$ 1,089	$ 372

The amount of deferred tax asset on losses for which no deferred tax asset is recognized in the statement of financial position.

No definition available.

Name:	iren_DeferredTaxAssetOnLossesForWhichNoDeferredTaxAssetRecognized
Namespace Prefix:	iren_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant