Share-based payments (Details)	6 Months Ended
Dec. 31, 2025 ShareSchemes
Share based payment arrangement [Abstract]
Number of share schemes	2
Options vesting period	12 months
Options expiration period	60 months
Vesting percentage of performance units	200.00%
Share Options [Member]
Share based payment arrangement [Abstract]
Number of trading days	10 days
Vested performance period for allocating shares or procure payment	30 days
Performance Rights- Time Based [Member]
Share based payment arrangement [Abstract]
Number of trading days	10 days
Retention on Employment [Member]
Share based payment arrangement [Abstract]
Performance rights vesting period	3 years
LTI Grants Time Based [Member]
Share based payment arrangement [Abstract]
Performance rights vesting period	42 months
Vesting period of other equity instruments thereafter	36 months
LTI Grants Performance Based [Member]
Share based payment arrangement [Abstract]
Performance rights vesting period	42 months
Vesting period of other equity instruments thereafter	36 months
Share Options 2010 [Member]
Share based payment arrangement [Abstract]
Options expiration period if not exercised after a participant resigns	90 days
Number of business days for calculating weighted average price	5 days
Tranche 2 [Member]
Share based payment arrangement [Abstract]
Options expiration date	Nov. 14, 2024

Percentage of vesting of performance units below, at or above targets .

No definition available.

Name:	ionr_MaximumVestingPercentageOfPerformanceUnits
Namespace Prefix:	ionr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of business days for calculating weighted average of the last sale price of the Company's shares, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ionr_NumberOfBusinessDaysForCalculatingWeightedAveragePrice
Namespace Prefix:	ionr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of share schemes in operation.

+ References

No definition available.

+ Details

Name:	ionr_NumberOfShareSchemes
Namespace Prefix:	ionr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of consecutive trading days, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ionr_NumberOfTradingDays
Namespace Prefix:	ionr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The option life of share options granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ionr_OptionsExpirationPeriod
Namespace Prefix:	ionr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The options expiration period if not exercised after a participant resigns from the company, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ionr_OptionsExpirationPeriodIfNotExercisedAfterAParticipantResigns
Namespace Prefix:	ionr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The vesting period of share options granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ionr_OptionsVestingPeriod
Namespace Prefix:	ionr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	ionr_ShareBasedPaymentArrangementAbstract
Namespace Prefix:	ionr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The date on which share options are expired, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	ionr_ShareOptionsExpirationDate
Namespace Prefix:	ionr_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of days vested performance right must either allocate shares or procure payment to participant of a cash amount equal to the market price of shares, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ionr_VestedPerformancePeriodForAllocatingSharesOrProcurePayment
Namespace Prefix:	ionr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The vesting period of other than options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ionr_VestingPeriodOfOtherEquityInstruments
Namespace Prefix:	ionr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The vesting period of other than options thereafter, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ionr_VestingPeriodOfOtherEquityInstrumentsThereafter
Namespace Prefix:	ionr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=ifrs-full_ShareOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=ionr_PerformanceRightsTimeBasedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=ionr_RetentionOnEmploymentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=ionr_LongTermIncentiveGrantsTimeBasedPerformanceRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=ionr_LongTermIncentiveGrantsPerformanceBasedPerformanceRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=ionr_ShareOptions2010Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=ionr_TrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: