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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

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- 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

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- 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