$NWN
Northwest Natural Holding Co Stock $nwn

$nwn Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000173399824000011 Filed on February 23, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$433.5M	$355.7M	$1.197B
YoY Change	-6.26%	-5.21%	15.44%
Cost Of Revenue	$194.0M	$157.4M	$548.5M
YoY Change	-13.71%	-14.46%	16.34%
Gross Profit	$239.5M	$198.3M	$649.0M
YoY Change	0.79%	3.7%	14.68%
Gross Profit Margin	55.25%	55.75%	54.19%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$33.10M	$32.76M	$125.6M
YoY Change	5.19%	5.2%	7.6%
% of Gross Profit	13.82%	16.52%	19.35%
Operating Expenses	$323.6M	$123.2M	$1.013B
YoY Change	-7.24%	11.94%	16.4%
Operating Profit	$109.8M	$75.17M	$184.9M
YoY Change	-3.24%	-7.46%	10.43%
Interest Expense	-$20.53M	-$19.89M	-$76.57M
YoY Change	12.22%	16.38%	43.79%
% of Operating Profit	-18.69%	-26.46%	-41.4%
Other Income/Expense, Net	-$1.134M	$4.627M	$17.86M
YoY Change	-170.61%	1468.47%	1384.21%
Pretax Income	$88.16M	$59.90M	$126.2M
YoY Change	-8.94%	-7.03%	9.35%
Income Tax	$24.34M	$15.26M	$32.36M
% Of Pretax Income	27.61%	25.48%	25.64%
Net Earnings	$63.82M	$44.64M	$93.87M
YoY Change	-10.95%	-6.88%	8.77%
Net Earnings / Revenue	14.72%	12.55%	7.84%
Basic Earnings Per Share	$1.69		$2.59
Diluted Earnings Per Share	$1.69	$1.20	$2.59
COMMON SHARES
Basic Shares Outstanding	37.68M shares	36.78M shares	36.21M shares
Diluted Shares Outstanding	37.80M shares		36.27M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$72.38M	$32.92M	$32.92M
YoY Change	-48.6%	12.47%	12.47%
Cash & Equivalents	$72.38M	$32.92M	$32.92M
Short-Term Investments
Other Short-Term Assets	$49.90M	$65.28M	$338.1M
YoY Change	18.89%	6.51%	-26.86%
Inventory	$99.87M	$112.6M	$112.6M
Prepaid Expenses
Receivables	$124.3M	$117.9M	$117.9M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$537.7M	$601.4M	$601.4M
YoY Change	-6.67%	-19.18%	-19.18%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.442B	$3.358B	$3.559B
YoY Change	9.05%	7.82%	7.14%
Goodwill	$163.0M	$163.3M
YoY Change	8.81%	9.38%
Intangibles
YoY Change
Long-Term Investments	$84.08M	$103.0M	$103.0M
YoY Change	-10.18%	348.2%	7.57%
Other Assets	$111.1M	$106.2M	$440.1M
YoY Change	13.63%	16.09%	0.71%
Total Long-Term Assets	$4.311B	$4.266B	$4.266B
YoY Change	7.36%	6.53%	6.53%
TOTAL ASSETS
Total Short-Term Assets	$537.7M	$601.4M	$601.4M
Total Long-Term Assets	$4.311B	$4.266B	$4.266B
Total Assets	$4.849B	$4.867B	$4.867B
YoY Change	5.6%	2.5%	2.5%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$107.9M	$145.4M	$145.4M
YoY Change	-2.94%	-19.54%	-19.54%
Accrued Expenses	$18.41M	$18.17M	$18.17M
YoY Change	24.5%	55.52%	55.52%
Deferred Revenue
YoY Change
Short-Term Debt	$94.70M	$89.80M	$89.78M
YoY Change	30.62%	-65.22%	-65.23%
Long-Term Debt Due	$869.0K	$150.9M	$150.9M
YoY Change	-99.64%	66.34%	66.34%
Total Short-Term Liabilities	$468.3M	$696.9M	$696.9M
YoY Change	-27.28%	-22.46%	-22.46%
LONG-TERM LIABILITIES
Long-Term Debt	$1.575B	$1.425B	$1.425B
YoY Change	21.64%	14.38%	14.39%
Other Long-Term Liabilities	$120.2M	$119.0M	$1.078B
YoY Change	1.9%	-3.57%	1.54%
Total Long-Term Liabilities	$1.695B	$1.544B	$2.504B
YoY Change	19.99%	12.76%	8.47%
TOTAL LIABILITIES
Total Short-Term Liabilities	$468.3M	$696.9M	$696.9M
Total Long-Term Liabilities	$1.695B	$1.544B	$2.504B
Total Liabilities	$2.163B	$2.241B	$3.583B
YoY Change	5.18%	-1.19%	0.29%
SHAREHOLDERS EQUITY
Retained Earnings	$445.1M	$399.9M
YoY Change	3.36%	6.23%
Common Stock	$905.2M	$891.0M
YoY Change	9.81%	10.65%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.343B	$1.284B	$1.284B
YoY Change
Total Liabilities & Shareholders Equity	$4.849B	$4.867B	$4.867B
YoY Change	5.6%	2.5%	2.5%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$63.82M	$44.64M	$93.87M
YoY Change	-10.95%	-6.88%	8.77%
Depreciation, Depletion And Amortization	$33.10M	$32.76M	$125.6M
YoY Change	5.19%	5.2%	7.6%
Cash From Operating Activities	$125.0M	-$21.55M	$279.9M
YoY Change	-29.3%	17.85%	89.57%
INVESTING ACTIVITIES
Capital Expenditures	$82.22M	$84.60M	$327.3M
YoY Change	15.37%	-2.49%	-3.32%
Acquisitions	$0.00		$7.533M
YoY Change	-100.0%		-92.01%
Other Investing Activities	-$729.0K	-$377.0K	-$383.0K
YoY Change	-156.73%	-99.59%	-122.69%
Cash From Investing Activities	-$82.49M	-$84.98M	-$335.5M
YoY Change	12.97%	-52.38%	-22.96%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$66.50M
YoY Change			-68.12%
Debt Paid & Issued, Net	$150.0M		$90.00M
YoY Change
Cash From Financing Activities	-$2.917M	-15.33M	$64.21M
YoY Change	-126.07%	-113.05%	-78.71%
NET CHANGE
Cash From Operating Activities	$125.0M	-21.55M	$279.9M
Cash From Investing Activities	-$82.49M	-84.98M	-$335.5M
Cash From Financing Activities	-$2.917M	-15.33M	$64.21M
Net Change In Cash	$39.63M	-121.9M	$8.660M
YoY Change	-65.54%	53.65%	-37.45%
FREE CASH FLOW
Cash From Operating Activities	$125.0M	-$21.55M	$279.9M
Capital Expenditures	$82.22M	$84.60M	$327.3M
Free Cash Flow	$42.82M	-$106.2M	-$47.40M
YoY Change	-59.45%	1.05%	-75.18%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P0Y
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	32362000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	93868000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	86303000	usd
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.54
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.56
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1175441000	usd
CY2023	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-383000	usd
CY2023	us-gaap	Revenues Revenues	1197475000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1039765000	usd
CY2022	us-gaap	Revenues Revenues	1037353000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	828155000	usd
CY2021	us-gaap	Revenues Revenues	860400000	usd
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	78100000	usd
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	19000000	usd
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	14900000	usd
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	7400000	usd
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	16900000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36213000	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36265000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	33984000	shares
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.59
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.54
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.56
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.59
CY2022Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	248582000	usd
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001733998
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CY2023	us-gaap	Operating Lease Income Comprehensive Income Extensible List OperatingLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#Revenues
CY2022	us-gaap	Operating Lease Income Comprehensive Income Extensible List OperatingLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#Revenues
CY2021	us-gaap	Operating Lease Income Comprehensive Income Extensible List OperatingLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#Revenues
CY2023	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	273766000	usd
CY2022	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	224667000	usd
CY2021	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	204227000	usd
CY2023	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	12899000	usd
CY2022	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	12389000	usd
CY2023	us-gaap	Sales Type Lease Income Comprehensive Income Extensible List SalesTypeLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#Revenues
CY2022	us-gaap	Sales Type Lease Income Comprehensive Income Extensible List SalesTypeLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#Revenues
CY2021	us-gaap	Sales Type Lease Income Comprehensive Income Extensible List SalesTypeLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#Revenues
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#PropertyPlantAndEquipmentNet
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#PropertyPlantAndEquipmentNet
CY2023Q4	nwn	Return On Invested Capital Threshold Performance Shares ReturnOnInvestedCapitalThresholdPerformanceShares	P3Y
CY2023Q4	nwn	Return On Invested Capital Threshold Performance Shares ReturnOnInvestedCapitalThresholdPerformanceShares	P3Y
CY2023	us-gaap	Derivative Gain Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeGainStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#Revenues
CY2022	us-gaap	Derivative Gain Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeGainStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#Revenues
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CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	1-38681
CY2023	dei	Entity Registrant Name EntityRegistrantName	NORTHWEST NATURAL HOLDING COMPANY
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	OR
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	82-4710680
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	250 S.W. Taylor Street
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Portland
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	OR
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	97204
CY2023	dei	City Area Code CityAreaCode	(503)
CY2023	dei	Local Phone Number LocalPhoneNumber	226-4211
CY2023	dei	Security12b Title Security12bTitle	Common Stock
CY2023	dei	Trading Symbol TradingSymbol	NWN
CY2023	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	1534376401	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	37676740	shares
CY2023	dei	Auditor Firm AuditorFirmId	238
CY2023	dei	Auditor Name AuditorName	PricewaterhouseCoopers LLP
CY2023	dei	Auditor Location AuditorLocation	Portland, Oregon
CY2023	us-gaap	Revenues Revenues	1197475000	usd
CY2022	us-gaap	Revenues Revenues	1037353000	usd
CY2021	us-gaap	Revenues Revenues	860400000	usd
CY2023	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	499837000	usd
CY2022	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	429635000	usd
CY2021	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	292314000	usd
CY2021	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	9938000	usd
CY2023	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	46248000	usd
CY2022	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	41031000	usd
CY2021	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	38633000	usd
CY2023	nwn	Excise Taxes ExciseTaxes	48671000	usd
CY2022	nwn	Excise Taxes ExciseTaxes	41826000	usd
CY2021	nwn	Excise Taxes ExciseTaxes	34740000	usd
CY2023	us-gaap	Depreciation And Amortization DepreciationAndAmortization	125581000	usd
CY2022	us-gaap	Depreciation And Amortization DepreciationAndAmortization	116707000	usd
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	113534000	usd
CY2023	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	5532000	usd
CY2022	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	3621000	usd
CY2021	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	3897000	usd
CY2023	us-gaap	Operating Expenses OperatingExpenses	1012534000	usd
CY2022	us-gaap	Operating Expenses OperatingExpenses	869876000	usd
CY2021	us-gaap	Operating Expenses OperatingExpenses	697283000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	184941000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	167477000	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	163117000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	17855000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1203000	usd
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-12559000	usd
CY2023	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-76566000	usd
CY2022	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-53247000	usd
CY2021	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-44486000	usd
CY2023	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	126230000	usd
CY2022	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	115433000	usd
CY2021	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	106072000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29130000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27406000	usd
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CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	-320	usd
CY2023	nwn	Unrealized Gain On Derivative Tax UnrealizedGainOnDerivativeTax	-21	usd
CY2022	nwn	Unrealized Gain On Derivative Tax UnrealizedGainOnDerivativeTax	-47	usd
CY2023	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	59000	usd
CY2022	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	129000	usd
CY2021	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	0	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	93104000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	91422000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	80164000	usd
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	33934000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	30702000	shares
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	905000	usd
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	30752000	shares
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	32920000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	29270000	usd
CY2023Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	121341000	usd
CY2022Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	168906000	usd
CY2023Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	83138000	usd
CY2022Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	89048000	usd
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3455000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3296000	usd
CY2023Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	178270000	usd
CY2022Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	117491000	usd
CY2023Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	11380000	usd
CY2022Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	194412000	usd
CY2023Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	112571000	usd
CY2022Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	87096000	usd
CY2023Q4	us-gaap	Other Assets Current OtherAssetsCurrent	65275000	usd
CY2022Q4	us-gaap	Other Assets Current OtherAssetsCurrent	61286000	usd
CY2023Q4	us-gaap	Assets Current AssetsCurrent	601440000	usd
CY2022Q4	us-gaap	Assets Current AssetsCurrent	744213000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4556609000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4261566000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1198555000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1147166000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3358054000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3114400000	usd
CY2023Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	333443000	usd
CY2022Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	340432000	usd
CY2023Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	431000	usd
CY2022Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	5045000	usd
CY2023Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	102951000	usd
CY2022Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	95704000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	71308000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	73429000	usd
CY2023Q4	us-gaap	Net Investment In Lease Noncurrent NetInvestmentInLeaseNoncurrent	129882000	usd
CY2022Q4	us-gaap	Net Investment In Lease Noncurrent NetInvestmentInLeaseNoncurrent	134302000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	163344000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	149283000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	106239000	usd
CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	91518000	usd
CY2023Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	4265652000	usd
CY2022Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	4004113000	usd
CY2023Q4	us-gaap	Assets Assets	4867092000	usd
CY2022Q4	us-gaap	Assets Assets	4748326000	usd
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	89780000	usd
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	258200000	usd
CY2023Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	150865000	usd
CY2022Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	90697000	usd
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	145361000	usd
CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	180667000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	15454000	usd
CY2022Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	15625000	usd
CY2023Q4	us-gaap	Interest Payable Current InterestPayableCurrent	15836000	usd
CY2022Q4	us-gaap	Interest Payable Current InterestPayableCurrent	10169000	usd
CY2023Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	84962000	usd
CY2022Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	248582000	usd
CY2023Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	98661000	usd
CY2022Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	28728000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2333000	usd
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1514000	usd
CY2023Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	93626000	usd
CY2022Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	64552000	usd
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	696878000	usd
CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	898734000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1425435000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1246167000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	382673000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	366022000	usd
CY2023Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	695896000	usd
CY2022Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	689578000	usd
CY2023Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	158116000	usd
CY2022Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	149143000	usd
CY2023Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	28055000	usd
CY2022Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	20838000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	77167000	usd
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	78965000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	119034000	usd
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	123438000	usd
CY2023Q4	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	1460941000	usd
CY2022Q4	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	1427984000	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	890976000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	805253000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	399911000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	376473000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7049000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6285000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	1283838000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	1175441000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4867092000	usd
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4748326000	usd
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	888733000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	80164000	usd
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.92
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	59410000	usd
CY2021	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	3615000	usd
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4543000	usd
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	17501000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	935146000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	91422000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.93
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	65609000	usd
CY2022	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	3228000	usd
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2978000	usd
CY2022	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	208276000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	93104000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.94
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	70430000	usd
CY2023	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	12884000	usd
CY2023	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	3598000	usd
CY2023	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2328000	usd
CY2023	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	66913000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1283838000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	93868000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	86303000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	78666000	usd
CY2023	us-gaap	Depreciation And Amortization DepreciationAndAmortization	125581000	usd
CY2022	us-gaap	Depreciation And Amortization DepreciationAndAmortization	116707000	usd
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	113534000	usd
CY2023	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	3217000	usd
CY2022	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	5589000	usd
CY2021	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	13897000	usd
CY2023	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	8966000	usd
CY2022	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	17410000	usd
CY2021	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	14617000	usd
CY2023	us-gaap	Pension Expense PensionExpense	-2430000	usd
CY2022	us-gaap	Pension Expense PensionExpense	5351000	usd
CY2021	us-gaap	Pension Expense PensionExpense	16556000	usd
CY2023	us-gaap	Pension Contributions PensionContributions	0	usd
CY2022	us-gaap	Pension Contributions PensionContributions	0	usd
CY2021	us-gaap	Pension Contributions PensionContributions	9590000	usd
CY2023	us-gaap	Other Increase Decrease In Environmental Liabilities OtherIncreaseDecreaseInEnvironmentalLiabilities	-26052000	usd
CY2022	us-gaap	Other Increase Decrease In Environmental Liabilities OtherIncreaseDecreaseInEnvironmentalLiabilities	-18160000	usd
CY2021	us-gaap	Other Increase Decrease In Environmental Liabilities OtherIncreaseDecreaseInEnvironmentalLiabilities	-18187000	usd
CY2023	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	12899000	usd
CY2022	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	12389000	usd
CY2021	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	9938000	usd
CY2023	nwn	Asset Optimization Revenue Sharing Bill Credits AssetOptimizationRevenueSharingBillCredits	-10471000	usd
CY2022	nwn	Asset Optimization Revenue Sharing Bill Credits AssetOptimizationRevenueSharingBillCredits	-41102000	usd
CY2021	nwn	Asset Optimization Revenue Sharing Bill Credits AssetOptimizationRevenueSharingBillCredits	-9053000	usd
CY2023	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-22972000	usd
CY2022	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-21558000	usd
CY2021	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-20622000	usd
CY2023	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-50977000	usd
CY2022	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	76454000	usd
CY2021	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	44128000	usd
CY2023	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	24105000	usd
CY2022	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	29269000	usd
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	14571000	usd
CY2023	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-1246000	usd
CY2022	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	6908000	usd
CY2021	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	3292000	usd
CY2023	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-39958000	usd
CY2022	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	24508000	usd
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	12118000	usd
CY2023	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	-52371000	usd
CY2022	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	-12334000	usd
CY2021	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	40541000	usd
CY2023	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-22637000	usd
CY2022	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-28937000	usd
CY2021	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-44458000	usd
CY2023	nwn	Change In Decoupling Regulatory Deferral ChangeInDecouplingRegulatoryDeferral	11415000	usd
CY2022	nwn	Change In Decoupling Regulatory Deferral ChangeInDecouplingRegulatoryDeferral	-10922000	usd
CY2021	nwn	Change In Decoupling Regulatory Deferral ChangeInDecouplingRegulatoryDeferral	5206000	usd
CY2023	nwn	Increase Decrease In Cloud Based Software Operating Assets IncreaseDecreaseInCloudBasedSoftwareOperatingAssets	16307000	usd
CY2022	nwn	Increase Decrease In Cloud Based Software Operating Assets IncreaseDecreaseInCloudBasedSoftwareOperatingAssets	23908000	usd
CY2021	nwn	Increase Decrease In Cloud Based Software Operating Assets IncreaseDecreaseInCloudBasedSoftwareOperatingAssets	7407000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-18445000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	12351000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	18662000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	279949000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	147672000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	160353000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	327347000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	338602000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	293892000	usd
CY2023	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	7533000	usd
CY2022	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	94279000	usd
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1289000	usd
CY2023	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	1000000	usd
CY2022	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	1000000	usd
CY2021	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	14450000	usd
CY2023	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	usd
CY2022	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	usd
CY2021	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	7000000	usd
CY2022	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1579000	usd
CY2021	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2508000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-335497000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-435460000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-300123000	usd
CY2023	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	66495000	usd
CY2022	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	208561000	usd
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	17501000	usd
CY2023	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	330000000	usd
CY2022	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	290000000	usd
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	185000000	usd
CY2023	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	90000000	usd
CY2022	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	usd
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	95000000	usd
CY2023	us-gaap	Proceeds From Debt Maturing In More Than Three Months ProceedsFromDebtMaturingInMoreThanThreeMonths	0	usd
CY2022	us-gaap	Proceeds From Debt Maturing In More Than Three Months ProceedsFromDebtMaturingInMoreThanThreeMonths	0	usd
CY2021	us-gaap	Proceeds From Debt Maturing In More Than Three Months ProceedsFromDebtMaturingInMoreThanThreeMonths	100000000	usd
CY2023	us-gaap	Repayments Of Debt Maturing In More Than Three Months RepaymentsOfDebtMaturingInMoreThanThreeMonths	0	usd
CY2022	us-gaap	Repayments Of Debt Maturing In More Than Three Months RepaymentsOfDebtMaturingInMoreThanThreeMonths	0	usd
CY2021	us-gaap	Repayments Of Debt Maturing In More Than Three Months RepaymentsOfDebtMaturingInMoreThanThreeMonths	100000000	usd
CY2023	nwn	Repayments Of Commercial Paper Maturities Greater Than Three Months RepaymentsOfCommercialPaperMaturitiesGreaterThanThreeMonths	0	usd
CY2022	nwn	Repayments Of Commercial Paper Maturities Greater Than Three Months RepaymentsOfCommercialPaperMaturitiesGreaterThanThreeMonths	0	usd
CY2021	nwn	Repayments Of Commercial Paper Maturities Greater Than Three Months RepaymentsOfCommercialPaperMaturitiesGreaterThanThreeMonths	-195025000	usd
CY2023	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-168540000	usd
CY2022	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-131300000	usd
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	280000000	usd
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	67340000	usd
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	62771000	usd
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	55919000	usd
CY2023	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2200000	usd
CY2022	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	912000	usd
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	3899000	usd
CY2023	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4207000	usd
CY2022	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1946000	usd
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1222000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	64208000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	301632000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	131436000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	8660000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	13844000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-8334000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	40964000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	27120000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	35454000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	49624000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	40964000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	27120000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	80197000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	50823000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	43719000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	24263000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2779000	usd
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	10555000	usd
CY2023	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	12884000	usd
CY2022	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	0	usd
CY2021	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	0	usd
CY2023	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	3131000	usd
CY2022	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	usd
CY2021	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	usd
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9.5pt;font-weight:700;line-height:120%;text-decoration:underline">Use of Estimates</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%"> </span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America (U.S. GAAP) requires management to make estimates and assumptions that affect reported amounts in the consolidated financial statements and accompanying notes. Actual amounts could differ from those estimates, and changes would most likely be reported in future periods. Management believes the estimates and assumptions used are reasonable</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">.</span></div>
CY2023Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	333443000	usd
CY2022Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	340432000	usd
CY2023Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	84962000	usd
CY2023Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	695896000	usd
CY2022Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	689578000	usd
CY2023	nwn	Weighted Average Depreciation Rates Transmission Distribution WeightedAverageDepreciationRatesTransmissionDistribution	0.025
CY2023	nwn	Weighted Average Depreciation Rates Utility Storage WeightedAverageDepreciationRatesUtilityStorage	0.022
CY2023	nwn	Weighted Average Depreciation Rates General Plant WeightedAverageDepreciationRatesGeneralPlant	0.067
CY2023	nwn	Weighted Average Depreciation Rates Intangible Other WeightedAverageDepreciationRatesIntangibleOther	0.053
CY2023	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.075
CY2022	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.028
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.007
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	32920000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	29270000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	49624000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	40964000	usd
CY2023Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	83100000	usd
CY2022Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	89000000	usd
CY2023	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	48700000	usd
CY2022	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	41800000	usd
CY2021	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	34700000	usd
CY2023Q4	nwn	Inactive Account Period Outstanding Prior To Write Off InactiveAccountPeriodOutstandingPriorToWriteOff	P120D
CY2023Q4	nwn	General Payment Term Of Ngd Receivables GeneralPaymentTermOfNGDReceivables	P15D
CY2023Q4	nwn	Age Of Closed Or Inactive Accounts AgeOfClosedOrInactiveAccounts	P120D
CY2021	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.56
CY2023Q4	nwn	Number Of Net Investments In Sales Type Leases NumberOfNetInvestmentsInSalesTypeLeases	2	numberofleases
CY2023Q4	us-gaap	Sales Type Lease Net Investment In Lease Allowance For Credit Loss SalesTypeLeaseNetInvestmentInLeaseAllowanceForCreditLoss	0	usd
CY2023Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	25600000	usd
CY2022Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	23500000	usd
CY2023Q4	nwn	Inventory Emissions Allowances InventoryEmissionsAllowances	39300000	usd
CY2023Q4	nwn	Cci Deferred Costs CCIDeferredCosts	20500000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	163300000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	149300000	usd
CY2023Q4	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0	usd
CY2023	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	93868000	usd
CY2022	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	86303000	usd
CY2021	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	78666000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36213000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	33934000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	30702000	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	52000	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	50000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	50000	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36265000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	33984000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	30752000	shares
CY2023	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.59
CY2022	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.54
CY2023	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.59
CY2022	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.54
CY2021	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.56
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1000	shares
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2000	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	7000	shares
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1173227000	usd
CY2023Q4	nwn	Revenue Over Time Performance Obligation Number RevenueOverTimePerformanceObligationNumber	1	performanceobligations
CY2023Q4	us-gaap	Lessor Sales Type Lease Term Of Contract1 LessorSalesTypeLeaseTermOfContract1	P30Y
CY2023Q4	us-gaap	Lessor Sales Type Lease Renewal Term1 LessorSalesTypeLeaseRenewalTerm1	P50Y
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	19900000	usd
CY2023Q4	us-gaap	Lessor Sales Type Lease Term Of Contract1 LessorSalesTypeLeaseTermOfContract1	P30Y
CY2023Q4	us-gaap	Lessor Sales Type Lease Renewal Term1 LessorSalesTypeLeaseRenewalTerm1	P50Y
CY2023	us-gaap	Lease Income LeaseIncome	16050000	usd
CY2022	us-gaap	Lease Income LeaseIncome	17193000	usd
CY2021	us-gaap	Lease Income LeaseIncome	17551000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	655000	usd
CY2023Q4	nwn	Lease Paymentstobe Received Nexttwelvemonths LeasePaymentstobeReceivedNexttwelvemonths	16522000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	652000	usd
CY2023Q4	nwn	Lease Paymentstobe Received Two Years LeasePaymentstobeReceivedTwoYears	15958000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	92000	usd
CY2023Q4	nwn	Lease Paymentstobe Received Three Years LeasePaymentstobeReceivedThreeYears	14993000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	79000	usd
CY2023Q4	nwn	Lease Paymentstobe Received Four Years LeasePaymentstobeReceivedFourYears	14600000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	58000	usd
CY2023Q4	nwn	Lease Paymentstobe Received Five Years LeasePaymentstobeReceivedFiveYears	14041000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	800000	usd
CY2023Q4	nwn	Lease Paymentstobe Received Thereafter LeasePaymentstobeReceivedThereafter	209116000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	2336000	usd
CY2023Q4	nwn	Lease Paymentstobe Received LeasePaymentstobeReceived	285230000	usd
CY2023Q4	us-gaap	Residual Value Of Leased Asset ResidualValueOfLeasedAsset	5500000	usd
CY2022Q4	us-gaap	Residual Value Of Leased Asset ResidualValueOfLeasedAsset	5100000	usd
CY2023	us-gaap	Operating Lease Expense OperatingLeaseExpense	7420000	usd
CY2023	us-gaap	Short Term Lease Cost ShortTermLeaseCost	925000	usd
CY2022	us-gaap	Operating Lease Expense OperatingLeaseExpense	7034000	usd
CY2022	us-gaap	Short Term Lease Cost ShortTermLeaseCost	880000	usd
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	6917000	usd
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1220000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	71308000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2333000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	77167000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	79500000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	73429000	usd
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1514000	usd
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	78965000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	80479000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P16Y2M12D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P17Y2M12D
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	7667000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	7538000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	7514000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	7645000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	7725000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	101278000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	139367000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	59867000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	79500000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2333000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	77167000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	0	usd
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	7610000	usd
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	369000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	659000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	470000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	7057000	usd
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	524000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	977000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	270000	usd
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	6898000	usd
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	801000	usd
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	223000	usd
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	314000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	0	usd
CY2023	nwn	Insurance Proceeds Amortization Period InsuranceProceedsAmortizationPeriod	P10Y6M
CY2023Q4	nwn	Insurance Proceeds Applied To Prudently Incurred Remediation Costs InsuranceProceedsAppliedToPrudentlyIncurredRemediationCosts	3900000	usd
CY2023	nwn	Cost Recovery Period CostRecoveryPeriod	P3Y
CY2023	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	872000	usd
CY2022	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	762000	usd
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	866000	usd
CY2023	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2421000	usd
CY2022	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2115000	usd
CY2021	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2406000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	305000	usd
CY2022	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	351000	usd
CY2021	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	344000	usd
CY2023	nwn	Commercial Paper Maximum Maturity CommercialPaperMaximumMaturity	P5D
CY2023	nwn	Commercial Paper Average Maturity CommercialPaperAverageMaturity	P4D
CY2023Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	6600000	usd
CY2022Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	6200000	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1586300000	usd
CY2022Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1345900000	usd
CY2023Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	10000000.0	usd
CY2022Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	9000000.0	usd
CY2023Q4	nwn	Long Term Debt Current Maturities Gross LongTermDebtCurrentMaturitiesGross	150900000	usd
CY2022Q4	nwn	Long Term Debt Current Maturities Gross LongTermDebtCurrentMaturitiesGross	90700000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1425400000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1246200000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	150868000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	30824000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	110852000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	65581000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	10866000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1217353000	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1586344000	usd
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	258200000	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1586344000	usd
CY2022Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1345851000	usd
CY2023Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	10044000	usd
CY2022Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	8987000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	1576300000	usd
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	1336864000	usd
CY2023Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	1447941000	usd
CY2022Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	1148395000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0400
CY2023	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2029
CY2023	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	0	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	20600000	usd
CY2023Q4	nwn	Pension Plan Withdrawal Liability Payments PensionPlanWithdrawalLiabilityPayments	P20Y
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	11124000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	8289000	usd
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	26508000	usd
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	24241000	usd
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	22275000	usd
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	10875000	usd
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	10139000	usd
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9962000	usd
CY2023	nwn	Other Tax Expense Benefit Differences To Be Flowed Through By Regulatory Commissions OtherTaxExpenseBenefitDifferencesToBeFlowedThroughByRegulatoryCommissions	-3976000	usd
CY2022	nwn	Other Tax Expense Benefit Differences To Be Flowed Through By Regulatory Commissions OtherTaxExpenseBenefitDifferencesToBeFlowedThroughByRegulatoryCommissions	-4748000	usd
CY2021	nwn	Other Tax Expense Benefit Differences To Be Flowed Through By Regulatory Commissions OtherTaxExpenseBenefitDifferencesToBeFlowedThroughByRegulatoryCommissions	-4655000	usd
CY2023	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1045000	usd
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-502000	usd
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-176000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	32362000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29130000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27406000	usd
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.256
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.252
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.258
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	13496000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	5172000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	6508000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	9901000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6551000	usd
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CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14617000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	32362000	usd
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CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2018000	usd
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CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	443	usd
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-1233000	usd
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	4195000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	410000	usd
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	89800000	usd

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$NWN
Northwest Natural Holding Co Stock $nwn

2024 Q1 Form 10-K Financial Statement

#000173399824000011 Filed on February 23, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWN Northwest Natural Holding Co Stock $nwn

2024 Q1 Form 10-K Financial Statement

#000173399824000011 Filed on February 23, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWN
Northwest Natural Holding Co Stock $nwn