10-K Filing

Knife River Corp CIK: 1955520 FY 2023

Filing Information

Form Type	10-K
Accession Number	`0001955520-24-000007`
Period End Date	20231231
Filing Date	20240227
Fiscal Year	2023
Fiscal Period	FY
XBRL Instance	knf-20231231_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 95 Income Statement 42 Cash Flow Statement 107 Stockholders Equity 33 Comprehensive Income 30

Balance Sheet 95 line items

Line Item	Tag	Value	Unit	Period
Common stock, par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Common stock, par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Common stock, par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$10.00	USD	Point-in-time
Common stock, shares authorized (in shares)	`CommonStockSharesAuthorized`	300.00M	shares	Point-in-time
Common stock, shares authorized (in shares)	`CommonStockSharesAuthorized`	80,000.00	shares	Point-in-time
Cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$10.09M	USD	Point-in-time
Common stock, shares issued (in shares)	`CommonStockSharesIssued`	57.01M	shares	Point-in-time
Cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$13.85M	USD	Point-in-time
Common stock, shares issued (in shares)	`CommonStockSharesIssued`	80,000.00	shares	Point-in-time
Cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$262.32M	USD	Point-in-time
Cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$7.07M	USD	Point-in-time
Receivables, net	`ReceivablesNetCurrent`	$210.16M	USD	Point-in-time
Receivables, net	`ReceivablesNetCurrent`	$266.79M	USD	Point-in-time
Common stock, shares outstanding (in shares)	`CommonStockSharesOutstanding`	80,000.00	shares	Point-in-time
Common stock, shares outstanding (in shares)	`CommonStockSharesOutstanding`	56.58M	shares	Point-in-time
Costs and estimated earnings in excess of billings on uncompleted contracts	`ContractWithCustomerAssetNetCurrent`	$27.29M	USD	Point-in-time
Common stock held by subsidiary (in shares)	`CommonStockHeldBySubsidiaryShares`	538,921.00	shares	Point-in-time
Costs and estimated earnings in excess of billings on uncompleted contracts	`ContractWithCustomerAssetNetCurrent`	$31.14M	USD	Point-in-time
Treasury stock held at cost (in shares)	`TreasuryStockCommonShares`	431,136.00	shares	Point-in-time
Due from related-party	`DueFromRelatedParty`	$16.05M	USD	Point-in-time
Due from related-party	`DueFromRelatedParty`	-	USD	Point-in-time
Inventories	`InventoryNet`	$323.28M	USD	Point-in-time
Inventories	`InventoryNet`	$319.62M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$17.85M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$37.52M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$608.57M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$913.54M	USD	Point-in-time
Net property, plant and equipment	`PropertyPlantAndEquipmentNet`	$1.32B	USD	Point-in-time
Net property, plant and equipment	`PropertyPlantAndEquipmentNet`	$1.32B	USD	Point-in-time
Net property, plant and equipment	`PropertyPlantAndEquipmentNet`	$1.25B	USD	Point-in-time
Goodwill	`Goodwill`	$276.43M	USD	Point-in-time
Goodwill	`Goodwill`	$274.48M	USD	Point-in-time
Goodwill	`Goodwill`	$274.54M	USD	Point-in-time
Other intangible assets, net	`IntangibleAssetsNetExcludingGoodwill`	$13.43M	USD	Point-in-time
Other intangible assets, net	`IntangibleAssetsNetExcludingGoodwill`	$10.82M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$44.71M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$45.87M	USD	Point-in-time
Investments and other	`OtherAssetsNoncurrent`	$36.70M	USD	Point-in-time
Investments and other	`OtherAssetsNoncurrent`	$41.22M	USD	Point-in-time
Total noncurrent assets	`AssetsNoncurrent`	$1.69B	USD	Point-in-time
Total noncurrent assets	`AssetsNoncurrent`	$1.69B	USD	Point-in-time
Total assets	`Assets`	$2.29B	USD	Point-in-time
Total assets	`Assets`	$2.18B	USD	Point-in-time
Total assets	`Assets`	$2.60B	USD	Point-in-time
Long-term debt - current portion	`LongTermDebtCurrent`	$7.08M	USD	Point-in-time
Long-term debt - current portion	`LongTermDebtCurrent`	$211.00K	USD	Point-in-time
Related-party notes payable - current portion	`RelatedPartyNotesPayableCurrentPortion`	-	USD	Point-in-time
Related-party notes payable - current portion	`RelatedPartyNotesPayableCurrentPortion`	$238.00M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$87.37M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$107.66M	USD	Point-in-time
Billings in excess of costs and estimated earnings on uncompleted contracts	`ContractWithCustomerLiabilityCurrent`	$51.38M	USD	Point-in-time
Billings in excess of costs and estimated earnings on uncompleted contracts	`ContractWithCustomerLiabilityCurrent`	$39.84M	USD	Point-in-time
Billings in excess of costs and estimated earnings on uncompleted contracts	`ContractWithCustomerLiabilityCurrent`	$32.35M	USD	Point-in-time
Accrued compensation	`EmployeeRelatedLiabilitiesCurrent`	$29.19M	USD	Point-in-time
Accrued compensation	`EmployeeRelatedLiabilitiesCurrent`	$48.10M	USD	Point-in-time
Due to related-party	`DueToRelatedParty`	$20.29M	USD	Point-in-time
Due to related-party	`DueToRelatedParty`	-	USD	Point-in-time
Current operating lease liabilities	`OperatingLeaseLiabilityCurrent`	$13.21M	USD	Point-in-time
Current operating lease liabilities	`OperatingLeaseLiabilityCurrent`	$12.95M	USD	Point-in-time
Other accrued liabilities	`OtherLiabilitiesCurrent`	$120.11M	USD	Point-in-time
Other accrued liabilities	`OtherLiabilitiesCurrent`	$88.78M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$347.27M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$516.89M	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$427.00K	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$674.58M	USD	Point-in-time
Related-party notes payable	`RelatedPartyNotesPayable`	-	USD	Point-in-time
Related-party notes payable	`RelatedPartyNotesPayable`	$446.45M	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$175.80M	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$174.54M	USD	Point-in-time
Noncurrent operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$32.66M	USD	Point-in-time
Noncurrent operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$31.76M	USD	Point-in-time
Other	`OtherLiabilitiesNoncurrent`	$93.50M	USD	Point-in-time
Other	`OtherLiabilitiesNoncurrent`	$105.65M	USD	Point-in-time
Total liabilities	`Liabilities`	$1.27B	USD	Point-in-time
Total liabilities	`Liabilities`	$1.33B	USD	Point-in-time
Commitments and contingencies	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and contingencies	`CommitmentsAndContingencies`	-	USD	Point-in-time
Common stock, 300,000,000 shares authorized, $0.01 par value, 57,009,542 shares issued and 56,578,406 shares outstanding at December 31, 2023; 80,000 shares authorized, issued and outstanding, $10 par value, at December 31, 2022	`CommonStockValue`	$800.00K	USD	Point-in-time
Common stock, 300,000,000 shares authorized, $0.01 par value, 57,009,542 shares issued and 56,578,406 shares outstanding at December 31, 2023; 80,000 shares authorized, issued and outstanding, $10 par value, at December 31, 2022	`CommonStockValue`	$570.00K	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$549.11M	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$614.51M	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$665.87M	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$494.66M	USD	Point-in-time
MDU Resources common stock held by subsidiary at cost - 538,921 shares	`CommonStockHeldBySubsidiary`	-	USD	Point-in-time
MDU Resources common stock held by subsidiary at cost - 538,921 shares	`CommonStockHeldBySubsidiary`	$3.63M	USD	Point-in-time
Treasury stock held at cost - 431,136 shares	`TreasuryStockCommonValue`	$3.63M	USD	Point-in-time
Treasury stock held at cost - 431,136 shares	`TreasuryStockCommonValue`	-	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-12.35M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-11.32M	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$878.24M	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$1.27B	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$1.03B	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$952.84M	USD	Point-in-time
Total liabilities and stockholders equity	`LiabilitiesAndStockholdersEquity`	$2.29B	USD	Point-in-time
Total liabilities and stockholders equity	`LiabilitiesAndStockholdersEquity`	$2.60B	USD	Point-in-time

Income Statement 42 line items

Line Item	Tag	Value	Unit	Period
Revenue:	`Revenues`	$2.53B	USD	Annual
Revenue:	`Revenues`	$2.23B	USD	Annual
Revenue:	`Revenues`	$2.83B	USD	Annual
Cost of revenue:	`CostOfRevenue`	$2.17B	USD	Annual
Cost of revenue:	`CostOfRevenue`	$1.88B	USD	Annual
Cost of revenue:	`CostOfRevenue`	$2.29B	USD	Annual
Gross profit	`GrossProfit`	$346.95M	USD	Annual
Gross profit	`GrossProfit`	$538.93M	USD	Annual
Gross profit	`GrossProfit`	$360.89M	USD	Annual
Selling, general and administrative expenses	`SellingGeneralAndAdministrativeExpense`	$166.60M	USD	Annual
Selling, general and administrative expenses	`SellingGeneralAndAdministrativeExpense`	$155.87M	USD	Annual
Selling, general and administrative expenses	`SellingGeneralAndAdministrativeExpense`	$242.54M	USD	Annual
Operating income	`OperatingIncomeLoss`	$191.08M	USD	Annual
Operating income	`OperatingIncomeLoss`	$296.40M	USD	Annual
Operating income	`OperatingIncomeLoss`	$194.29M	USD	Annual
Interest expense	`InterestExpense`	$19.22M	USD	Annual
Interest expense	`InterestExpense`	$58.10M	USD	Annual
Interest expense	`InterestExpense`	$30.12M	USD	Annual
Other (expense) income	`OtherNonoperatingIncomeExpense`	$-5.35M	USD	Annual
Other (expense) income	`OtherNonoperatingIncomeExpense`	$1.35M	USD	Annual
Other (expense) income	`OtherNonoperatingIncomeExpense`	$7.01M	USD	Annual
Income before income taxes	`IncomeLossAttributableToParent`	$245.31M	USD	Annual
Income before income taxes	`IncomeLossAttributableToParent`	$173.21M	USD	Annual
Income before income taxes	`IncomeLossAttributableToParent`	$158.82M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$62.44M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$42.60M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$43.46M	USD	Annual
Net income	`NetIncomeLoss`	$129.75M	USD	Annual
Net income	`NetIncomeLoss`	$116.22M	USD	Annual
Net income	`NetIncomeLoss`	$182.87M	USD	Annual
Earnings per share basic (in dollars per share)	`EarningsPerShareBasic`	$2.29	USD	Annual
Earnings per share basic (in dollars per share)	`EarningsPerShareBasic`	$3.23	USD	Annual
Earnings per share basic (in dollars per share)	`EarningsPerShareBasic`	$2.05	USD	Annual
Earnings per share diluted (in dollars per share)	`EarningsPerShareDiluted`	$2.05	USD	Annual
Earnings per share diluted (in dollars per share)	`EarningsPerShareDiluted`	$2.29	USD	Annual
Earnings per share diluted (in dollars per share)	`EarningsPerShareDiluted`	$3.23	USD	Annual
Weighted average common shares outstanding basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	56.57M	shares	Annual
Weighted average common shares outstanding basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	56.57M	shares	Annual
Weighted average common shares outstanding basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	56.57M	shares	Annual
Weighted average common shares outstanding diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	56.57M	shares	Annual
Weighted average common shares outstanding diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	56.67M	shares	Annual
Weighted average common shares outstanding diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	56.57M	shares	Annual

Cash Flow Statement 107 line items

Line Item	Tag	Value	Unit	Period
Net income	`NetIncomeLoss`	$116.22M	USD	Annual
Net income	`NetIncomeLoss`	$182.87M	USD	Annual
Net income	`NetIncomeLoss`	$129.75M	USD	Annual
Depreciation, depletion and amortization	`DepreciationDepletionAndAmortization`	$117.80M	USD	Annual
Depreciation, depletion and amortization	`DepreciationDepletionAndAmortization`	$100.97M	USD	Annual
Depreciation, depletion and amortization	`DepreciationDepletionAndAmortization`	$123.81M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$32.86M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$-1.61M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$2.08M	USD	Annual
Provision for credit losses	`ProvisionForDoubtfulAccounts`	$2.00M	USD	Annual
Provision for credit losses	`ProvisionForDoubtfulAccounts`	$538.00K	USD	Annual
Provision for credit losses	`ProvisionForDoubtfulAccounts`	$48.00K	USD	Annual
Amortization of debt issuance costs	`AmortizationOfFinancingCosts`	$402.00K	USD	Annual
Amortization of debt issuance costs	`AmortizationOfFinancingCosts`	$3.12M	USD	Annual
Amortization of debt issuance costs	`AmortizationOfFinancingCosts`	$483.00K	USD	Annual
Employee stock-based compensation costs	`ShareBasedCompensation`	$1.85M	USD	Annual
Employee stock-based compensation costs	`ShareBasedCompensation`	$1.27M	USD	Annual
Employee stock-based compensation costs	`ShareBasedCompensation`	$2.89M	USD	Annual
Pension and postretirement benefit plan net periodic benefit cost	`PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash`	$1.18M	USD	Annual
Pension and postretirement benefit plan net periodic benefit cost	`PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash`	$1.31M	USD	Annual
Pension and postretirement benefit plan net periodic benefit cost	`PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash`	$1.09M	USD	Annual
Unrealized (gains) losses on investments	`UnrealizedGainLossOnInvestments`	$-2.52M	USD	Annual
Unrealized (gains) losses on investments	`UnrealizedGainLossOnInvestments`	$1.63M	USD	Annual
Unrealized (gains) losses on investments	`UnrealizedGainLossOnInvestments`	$2.20M	USD	Annual
Gains on sale of assets	`GainLossOnDispositionOfAssets1`	$6.64M	USD	Annual
Gains on sale of assets	`GainLossOnDispositionOfAssets1`	$14.09M	USD	Annual
Gains on sale of assets	`GainLossOnDispositionOfAssets1`	$27.00K	USD	Annual
Equity in (loss) earnings of unconsolidated affiliates	`EquityInResultsOfOperationsFromUnconsolidatedAffiliates`	$-438.00K	USD	Annual
Equity in (loss) earnings of unconsolidated affiliates	`EquityInResultsOfOperationsFromUnconsolidatedAffiliates`	$373.00K	USD	Annual
Equity in (loss) earnings of unconsolidated affiliates	`EquityInResultsOfOperationsFromUnconsolidatedAffiliates`	$286.00K	USD	Annual
Receivables	`IncreaseDecreaseInAccountsAndNotesReceivable`	$32.51M	USD	Annual
Receivables	`IncreaseDecreaseInAccountsAndNotesReceivable`	$-15.36M	USD	Annual
Receivables	`IncreaseDecreaseInAccountsAndNotesReceivable`	$54.82M	USD	Annual
Due from related-party	`IncreaseDecreaseInDueFromRelatedParties`	$-2.89M	USD	Annual
Due from related-party	`IncreaseDecreaseInDueFromRelatedParties`	$8.00M	USD	Annual
Due from related-party	`IncreaseDecreaseInDueFromRelatedParties`	$-16.05M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$31.03M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$42.44M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$-3.65M	USD	Annual
Other current assets	`IncreaseDecreaseInOtherCurrentAssets`	$19.56M	USD	Annual
Other current assets	`IncreaseDecreaseInOtherCurrentAssets`	$-44.00K	USD	Annual
Other current assets	`IncreaseDecreaseInOtherCurrentAssets`	$4.57M	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayableTrade`	$-13.90M	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayableTrade`	$17.49M	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayableTrade`	$33.09M	USD	Annual
Due to related-party	`IncreaseDecreaseInDueToRelatedPartiesCurrent`	$-7.31M	USD	Annual
Due to related-party	`IncreaseDecreaseInDueToRelatedPartiesCurrent`	$3.58M	USD	Annual
Due to related-party	`IncreaseDecreaseInDueToRelatedPartiesCurrent`	$-957.00K	USD	Annual
Other current liabilities	`IncreaseDecreaseInOtherCurrentLiabilities`	$48.98M	USD	Annual
Other current liabilities	`IncreaseDecreaseInOtherCurrentLiabilities`	$21.42M	USD	Annual
Other current liabilities	`IncreaseDecreaseInOtherCurrentLiabilities`	$-21.01M	USD	Annual
Pension and postretirement benefit plan contributions	`PensionAndOtherPostretirementBenefitContributions`	$426.00K	USD	Annual
Pension and postretirement benefit plan contributions	`PensionAndOtherPostretirementBenefitContributions`	$1.76M	USD	Annual
Pension and postretirement benefit plan contributions	`PensionAndOtherPostretirementBenefitContributions`	$392.00K	USD	Annual
Other noncurrent changes	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$-8.32M	USD	Annual
Other noncurrent changes	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$12.07M	USD	Annual
Other noncurrent changes	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$-5.65M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$335.73M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$207.44M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$181.24M	USD	Annual
Capital expenditures	`PaymentsToAcquireProductiveAssets`	$178.16M	USD	Annual
Capital expenditures	`PaymentsToAcquireProductiveAssets`	$174.23M	USD	Annual
Capital expenditures	`PaymentsToAcquireProductiveAssets`	$124.28M	USD	Annual
Acquisitions, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$235.22M	USD	Annual
Acquisitions, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	-	USD	Annual
Acquisitions, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$-1.75M	USD	Annual
Net proceeds from sale or disposition of property and other	`ProceedsFromSaleOfProductiveAssets`	$12.02M	USD	Annual
Net proceeds from sale or disposition of property and other	`ProceedsFromSaleOfProductiveAssets`	$22.88M	USD	Annual
Net proceeds from sale or disposition of property and other	`ProceedsFromSaleOfProductiveAssets`	$8.28M	USD	Annual
Investments	`PaymentsForProceedsFromInvestments`	$837.00K	USD	Annual
Investments	`PaymentsForProceedsFromInvestments`	$2.34M	USD	Annual
Investments	`PaymentsForProceedsFromInvestments`	$1.89M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-117.89M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-398.27M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-155.88M	USD	Annual
Issuance of current related-party notes	`ProceedsFromRepaymentsOfCurrentNotesPayable`	-	USD	Annual
Issuance of current related-party notes	`ProceedsFromRepaymentsOfCurrentNotesPayable`	-	USD	Annual
Issuance of current related-party notes	`ProceedsFromRepaymentsOfCurrentNotesPayable`	$208.00M	USD	Annual
Issuance (repayment) of long-term related-party notes, net	`ProceedsFromRepaymentsOfNoncurrentNotesPayable`	$205.28M	USD	Annual
Issuance (repayment) of long-term related-party notes, net	`ProceedsFromRepaymentsOfNoncurrentNotesPayable`	$-207.01M	USD	Annual
Issuance (repayment) of long-term related-party notes, net	`ProceedsFromRepaymentsOfNoncurrentNotesPayable`	$281.98M	USD	Annual
Issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	-	USD	Annual
Issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$700.00M	USD	Annual
Issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	-	USD	Annual
Repayment of long-term debt	`RepaymentsOfLongTermDebt`	$221.00K	USD	Annual
Repayment of long-term debt	`RepaymentsOfLongTermDebt`	$298.00K	USD	Annual
Repayment of long-term debt	`RepaymentsOfLongTermDebt`	$3.65M	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	$16.64M	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	-	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	$807.00K	USD	Annual
Net transfers to Centennial	`NetTransfersToFromParent`	$57.96M	USD	Annual
Net transfers to Centennial	`NetTransfersToFromParent`	$55.21M	USD	Annual
Net transfers to Centennial	`NetTransfersToFromParent`	$850.59M	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$34.39M	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-55.32M	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$223.80M	USD	Annual
Increase (decrease) in cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$-3.76M	USD	Annual
Increase (decrease) in cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$6.78M	USD	Annual
Increase (decrease) in cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$252.23M	USD	Annual
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$13.85M	USD	Point-in-time
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$262.32M	USD	Point-in-time
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$7.07M	USD	Point-in-time
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$10.09M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$7.07M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$10.09M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$262.32M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$13.85M	USD	Point-in-time

Stockholders Equity 33 line items

Line Item	Tag	Value	Unit	Period
Beginning balance (in shares)	`CommonStockSharesIssued`	80,000.00	shares	Point-in-time
Beginning balance (in shares)	`CommonStockSharesIssued`	57.01M	shares	Point-in-time
MDU Resources' stock held by subsidiary, beginning balance (in shares)	`CommonStockHeldBySubsidiaryShares`	538,921.00	shares	Point-in-time
Treasury stock, beginning balance (in shares)	`TreasuryStockCommonShares`	431,136.00	shares	Point-in-time
Beginning balance	`StockholdersEquity`	$878.24M	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$1.27B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$1.03B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$952.84M	USD	Point-in-time
Net income	`NetIncomeLoss`	$116.22M	USD	Annual
Net income	`NetIncomeLoss`	$182.87M	USD	Annual
Net income	`NetIncomeLoss`	$129.75M	USD	Annual
Other comprehensive income	`OtherComprehensiveIncomeLossNetOfTax`	$1.03M	USD	Annual
Other comprehensive income	`OtherComprehensiveIncomeLossNetOfTax`	$4.46M	USD	Annual
Other comprehensive income	`OtherComprehensiveIncomeLossNetOfTax`	$12.14M	USD	Annual
Stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$2.85M	USD	Annual
Issuance of common stock to directors for services	`StockIssuedDuringPeriodValueIssuedForServices`	$702.00K	USD	Annual
Retirement of historical common stock in connection with the Separation	`TreasuryStockRetiredCostMethodAmount`	-	USD	Annual
Issuance of common stock in connection with the Separation (in shares)	`StockIssuedDuringPeriodSharesNewIssues`	57.00M	shares	Point-in-time
Issuance of common stock in connection with the Separation	`StockIssuedDuringPeriodValueNewIssues`	-	USD	Annual
Transfer of MDU Resources stock held by subsidiary	`TransferOfStockHeldBySubsidiaryValue`	$3.63M	USD	Annual
Receipt of treasury stock at historical cost	`TreasuryStockValueAcquiredCostMethod`	$3.63M	USD	Annual
Net transfers from Centennial and MDU Resources including Separation adjustments	`NetEquityTransfersToFromParentIncludingSeparationAdjustments`	$62.97M	USD	Annual
Net transfers to Centennial	`NetEquityTransfersToFromParent`	$13.01M	USD	Annual
Net transfers to Centennial	`NetEquityTransfersToFromParent`	$59.62M	USD	Annual
Net transfers to Centennial	`NetEquityTransfersToFromParent`	$52.61M	USD	Annual
Ending balance (in shares)	`CommonStockSharesIssued`	80,000.00	shares	Point-in-time
Ending balance (in shares)	`CommonStockSharesIssued`	57.01M	shares	Point-in-time
MDU Resources' stock held by subsidiary, ending balance (in shares)	`CommonStockHeldBySubsidiaryShares`	538,921.00	shares	Point-in-time
Treasury stock, ending balance (in shares)	`TreasuryStockCommonShares`	431,136.00	shares	Point-in-time
Ending balance	`StockholdersEquity`	$878.24M	USD	Point-in-time
Ending balance	`StockholdersEquity`	$1.27B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$1.03B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$952.84M	USD	Point-in-time

Comprehensive Income 30 line items

Line Item	Tag	Value	Unit	Period
Net income	`NetIncomeLoss`	$116.22M	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income (loss), tax	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	$107.00K	USD	Annual
Net income	`NetIncomeLoss`	$182.87M	USD	Annual
Net income	`NetIncomeLoss`	$129.75M	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income (loss), tax	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	$107.00K	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income (loss), tax	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	$28.00K	USD	Annual
Postretirement liability gains (losses) arising during the period, tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax`	$-252.00K	USD	Annual
Postretirement liability gains (losses) arising during the period, tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax`	$-3.59M	USD	Annual
Postretirement liability gains (losses) arising during the period, tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax`	$-1.01M	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit cost, tax (expense) benefit	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$64.00K	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit cost, tax (expense) benefit	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$363.00K	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit cost, tax (expense) benefit	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$292.00K	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $28, $107 and $107 in 2023, 2022 and 2021, respectively	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	$-90.00K	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $28, $107 and $107 in 2023, 2022 and 2021, respectively	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	$-332.00K	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $28, $107 and $107 in 2023, 2022 and 2021, respectively	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	$-328.00K	USD	Annual
Pension and postretirement liability gains arising during the period, net of tax of $252, $3,586 and $1,011 in 2023, 2022 and 2021, respectively	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax`	$-10.94M	USD	Annual
Pension and postretirement liability gains arising during the period, net of tax of $252, $3,586 and $1,011 in 2023, 2022 and 2021, respectively	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax`	$-3.04M	USD	Annual
Pension and postretirement liability gains arising during the period, net of tax of $252, $3,586 and $1,011 in 2023, 2022 and 2021, respectively	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax`	$-751.00K	USD	Annual
Amortization of pension and postretirement liability losses included in net periodic benefit cost, net of tax of $64, $292 and $363 in 2023, 2022 and 2021, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$192.00K	USD	Annual
Amortization of pension and postretirement liability losses included in net periodic benefit cost, net of tax of $64, $292 and $363 in 2023, 2022 and 2021, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$875.00K	USD	Annual
Amortization of pension and postretirement liability losses included in net periodic benefit cost, net of tax of $64, $292 and $363 in 2023, 2022 and 2021, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$1.09M	USD	Annual
Pension and postretirement liability adjustment	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-11.81M	USD	Annual
Pension and postretirement liability adjustment	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-4.13M	USD	Annual
Pension and postretirement liability adjustment	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-943.00K	USD	Annual
Other comprehensive income	`OtherComprehensiveIncomeLossNetOfTax`	$1.03M	USD	Annual
Other comprehensive income	`OtherComprehensiveIncomeLossNetOfTax`	$4.46M	USD	Annual
Other comprehensive income	`OtherComprehensiveIncomeLossNetOfTax`	$12.14M	USD	Annual
Comprehensive income attributable to common stockholders	`ComprehensiveIncomeNetOfTax`	$134.22M	USD	Annual
Comprehensive income attributable to common stockholders	`ComprehensiveIncomeNetOfTax`	$183.91M	USD	Annual
Comprehensive income attributable to common stockholders	`ComprehensiveIncomeNetOfTax`	$128.36M	USD	Annual

Data is extracted from SEC EDGAR XBRL filings. Values shown are as reported in the filing.