debt instrument, Net Premium

No definition available.

Name:	ida_DebtinstrumentNetPremium
Namespace Prefix:	ida_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

debt instrument, net proceeds

+ References

No definition available.

+ Details

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Namespace Prefix:	ida_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date approved by the Regulatory Authority.

+ References

No definition available.

+ Details

Name:	ida_DebtinstrumentunusedborrowingcapacityRegulatoryAuthorityAmount
Namespace Prefix:	ida_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Premium on Repayment on Debt

+ References

No definition available.

+ Details

Name:	ida_PremiumonRepaymentonDebt
Namespace Prefix:	ida_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=ida_IdahoPowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ida_FirstMortgageBonds4.20KSeriesdue2048Domain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ida_PrincipalamountofdebtsecuritiesinSellingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ida_SupplementalIndentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ida_FirstMortgageBonds1.90LSeriesdue2030Domain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ida_FirstMortgageBonds450SeriesDue2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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- Details

Name:	us-gaap_DebtInstrumentAxis=ida_FirstMortgageBonds2.95Seriesdue2022Domain
Namespace Prefix:
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Period Type:

Long-Term Debt (Details) - Idaho Power [Member] - USD ($) $ in Millions	Jul. 29, 2020	Jul. 30, 2020	Jun. 30, 2020	Jun. 22, 2020	Jun. 05, 2020	Apr. 03, 2020
First Mortgage Bonds 4.20 K Series due 2048 [Domain]
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent						$ 230.0
Debt Instrument, Interest Rate, Stated Percentage						4.20%
debt Instrument, Net Premium						13.00%
debt Instrument, net proceeds						$ 259.9
Principal amount of debt securities in Selling Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount					$ 500.0
Supplemental Indenture [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount					$ 500.0
First Mortgage Bonds 1.90 L Series due 2030 [Domain]
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent				$ 80.0
Debt Instrument, Interest Rate, Stated Percentage				1.90%
First mortgage bonds 4.50 Series due 2020 [Member]
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent			$ 100.0
Debt Instrument, Interest Rate, Stated Percentage			3.40%
Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount		$ 420.0
debt instrument, unused borrowing capacity, Regulatory Authority Amount		$ 190.0
Subsequent Event \| First Mortgage Bonds 2.95 Series due 2022 [Domain]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.95%
Premium on Repayment on Debt	$ 3.3
Repayments of Debt	$ 75.0