XML 88 R77.htm IDEA: XBRL DOCUMENT
v3.22.2.2

MNPUC (Details) - MNPUC [Member] - Gas Distribution [Member] - Great Plains Natural Gas Co. [Member] - USD ($) | Oct. 19, 2022 | Jun. 01, 2022 | Sep. 01, 2021
--- | --- | --- | ---
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  | $ 8,800,000
Pending Rate Case [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Depreciation and Amortization Requested Rate Increase (Decrease), Amount |  | $ (1,200,000) |
Depreciation and Amortization, Rate, Percent |  | 4.50% |
Depreciation and Amortization, Requested Rate, Percent |  | 2.80% |
Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Disallowed Gas Costs | $ (845,000) |  |

X
- Definition Depreciation and Amortization, Rate, Percent + References No definition available. + Details
Name: | mdu_DepreciationAndAmortizationRatePercent
Namespace Prefix: | mdu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Depreciation and Amortization Requested Rate Increase (Decrease), Amount + References No definition available. + Details
Name: | mdu_DepreciationAndAmortizationRequestedRateIncreaseDecreaseAmount
Namespace Prefix: | mdu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Depreciation and Amortization, Requested Rate, Percent + References No definition available. + Details
Name: | mdu_DepreciationAndAmortizationRequestedRatePercent
Namespace Prefix: | mdu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disallowed Gas Costs (Increase) Decrease + References No definition available. + Details
Name: | mdu_DisallowedGasCostsIncreaseDecrease
Namespace Prefix: | mdu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- 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_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=mdu_MNPUCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_GasDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=mdu_GreatPlainsNaturalGasCo.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=mdu_PendingRateCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |