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REGULATORY MATTERS: Idaho Fixed Cost Adjustment (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
May 31, 2026 | Jun. 01, 2025 | Jun. 01, 2024 | Jun. 01, 2023
Idaho Fixed Cost Adjustment [Line Items] |  |  |  |
Annual fixed cost adjustment mechanism deferral |  | $ (3,100) | $ 36,800 | $ 25,100
Subsequent Event | Idaho Jurisdiction Fixed Cost Adjustment |  |  |  |
Idaho Fixed Cost Adjustment [Line Items] |  |  |  |
Approved Rate Increase (Decrease), Amount | $ (39,800) |  |  |
Idaho Fixed Cost Adjustment [Member] |  |  |  |
Idaho Fixed Cost Adjustment [Line Items] |  |  |  |
Percentage cap on the FCA adjustment |  |  | 3.00% |

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- Definition Annual fixed cost adjustment mechanism deferral amount, whether approved or requested. + References No definition available. + Details
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Namespace Prefix: | ida_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition [Line Items] for Idaho Fixed Cost Adjustment [Table] + References No definition available. + Details
Name: | ida_IdahoFixedCostAdjustmentLineItems
Namespace Prefix: | ida_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Percentage cap on the FCA adjustment. + References No definition available. + Details
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Namespace Prefix: | ida_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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Namespace Prefix: |
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- Details
Name: | ida_RateCaseMatterAxis=ida_IdahoJurisdictionFixedCostAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |