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Defined Benefit Plans, Number Of Plans

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Contractual interest rate for funds borrowed, under the debt agreement.

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LONG-TERM DEBT (Details) $ in Thousands	Mar. 31, 2026 USD ($) plan	Feb. 17, 2026 USD ($)	Mar. 31, 2025 plan	Mar. 14, 2024 USD ($)
Debt Instrument [Line Items]
Number of plans \| plan	2		2
First Mortgage Bonds 4.85 Series O Due 2036 [Domain]
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent		$ 350,000
Debt Instrument, Interest Rate, Stated Percentage		4.85%
Idaho Power Company
Debt Instrument [Line Items]
Debt instrument interest rate limit	8.00%
Debt Instrument, Unused Borrowing Capacity, Amount	$ 1,700,000
Indenture, Limit of first mortgate bonds at any one time outstanding	5,500,000
Idaho Power Company \| Principal amount of debt securities in Selling Agreement
Debt Instrument [Line Items]
Indenture, Unused Borrowing Capacity, Amount	2,100,000
Idaho Power Company \| Public Utility Commisions - Idaho, Oregon, and Washington
Debt Instrument [Line Items]
Indenture, Unused Borrowing Capacity, Amount	$ 150,000			$ 1,200,000