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Lease liabilities - Reconciliation of Lease Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Borrowings and Lease Liabilities Reconciliation [Roll Forward]
Balance at beginning of the period	$ 1,448	$ 1,267
Additions	344	390
Modifications	101
Lease charges	(398)	(332)
Finance charges	194	166
Exchange differences	(34)	(42)
Balance at ending of the period	1,655	$ 1,448
Current portion	214
Non-current portion	$ 1,441

X

- Definition

The amount of additions to lease liabilities.

+ References

No definition available.

+ Details

Name:	iren_AdditionsToLeaseLiabilities
Namespace Prefix:	iren_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of current portion and non-current borrowings and lease liabilities.

+ References

No definition available.

+ Details

Name:	iren_BorrowingsAndLeaseLiabilities
Namespace Prefix:	iren_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Borrowings and Lease Liabilities Reconciliation

+ References

No definition available.

+ Details

Name:	iren_BorrowingsAndLeaseLiabilitiesReconciliationRollForward
Namespace Prefix:	iren_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of finance charges of lease liabilities.

+ References

No definition available.

+ Details

Name:	iren_FinanceChargesOfLeaseLiabilities
Namespace Prefix:	iren_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of increase (decrease) in through net exchange differences, lease liabilities during the period.

+ References

No definition available.

+ Details

Name:	iren_IncreaseDecreaseThroughNetExchangeDifferencesLeaseLiabilities
Namespace Prefix:	iren_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of lease charges of lease liabilities.

+ References

No definition available.

+ Details

Name:	iren_LeaseChargesOfLeaseLiabilities
Namespace Prefix:	iren_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The non-current portion of non-current borrowings and lease liabilities.

+ References

No definition available.

+ Details

Name:	iren_LongTermBorrowingsAndLeaseLiabilities
Namespace Prefix:	iren_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Modifications to lease liabilities

+ References

No definition available.

+ Details

Name:	iren_ModificationsToLeaseLiabilities
Namespace Prefix:	iren_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of current borrowings and lease liabilities.

+ References

No definition available.

+ Details

Name:	iren_ShortTermBorrowingsAndLeaseLiabilities
Namespace Prefix:	iren_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant