$NWN
Northwest Natural Holding Co Stock $nwn

$nwn Overview Financials Valuation SEC Filings Company Website

2024 Q2 Form 10-Q Financial Statement

#000173399824000075 Filed on May 06, 2024

Income Statement

Concept	2024 Q2	2024 Q1	2023 Q1
Revenue	$211.7M	$433.5M	$462.4M
YoY Change	-10.99%	-6.26%	32.01%
Cost Of Revenue	$82.18M	$194.0M	$224.8M
YoY Change	-26.37%	-13.71%	41.42%
Gross Profit	$129.5M	$239.5M	$237.6M
YoY Change	2.61%	0.79%	24.19%
Gross Profit Margin	61.18%	55.25%	51.39%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$33.76M	$33.10M	$31.47M
YoY Change	7.89%	5.19%	10.68%
% of Gross Profit	26.06%	13.82%	13.24%
Operating Expenses	$196.0M	$323.6M	$348.9M
YoY Change	74.39%	-7.24%	32.84%
Operating Profit	$15.71M	$109.8M	$113.5M
YoY Change	13.46%	-3.24%	29.52%
Interest Expense	-$19.31M	-$20.53M	-$18.30M
YoY Change	1.78%	12.22%	58.79%
% of Operating Profit	-122.95%	-18.69%	-16.12%
Other Income/Expense, Net	$6.000K	-$1.134M	$1.606M
YoY Change	-99.91%	-170.61%	-268.34%
Pretax Income	-$3.599M	$88.16M	$96.82M
YoY Change	-342.03%	-8.94%	28.81%
Income Tax	-$812.0K	$24.34M	$25.15M
% Of Pretax Income		27.61%	25.97%
Net Earnings	-$2.787M	$63.82M	$71.67M
YoY Change	-324.04%	-10.95%	27.44%
Net Earnings / Revenue	-1.32%	14.72%	15.5%
Basic Earnings Per Share	-$0.07	$1.69	$2.01
Diluted Earnings Per Share	-$0.07	$1.69	$2.01
COMMON SHARES
Basic Shares Outstanding	38.03M shares	37.68M shares	35.54M shares
Diluted Shares Outstanding	38.26M shares	37.80M shares	35.71M shares

Balance Sheet

Concept	2024 Q2	2024 Q1	2023 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$65.19M	$72.38M	$140.8M
YoY Change	-52.68%	-48.6%	478.91%
Cash & Equivalents	$65.19M	$72.38M	$140.8M
Short-Term Investments
Other Short-Term Assets	$37.54M	$49.90M	$41.97M
YoY Change	-79.37%	18.89%	-0.85%
Inventory	$107.3M	$99.87M	$41.39M
Prepaid Expenses
Receivables	$58.06M	$124.3M	$157.4M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$423.1M	$537.7M	$576.2M
YoY Change	-7.59%	-6.67%	47.22%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.530B	$3.442B	$3.156B
YoY Change	3.38%	9.05%	8.65%
Goodwill	$163.2M	$163.0M	$149.8M
YoY Change	6.88%	8.81%	112.18%
Intangibles
YoY Change
Long-Term Investments	$83.80M	$84.08M	$93.61M
YoY Change	-19.68%	-10.18%	-2.76%
Other Assets	$112.7M	$111.1M	$97.79M
YoY Change	-72.3%	13.63%	30.52%
Total Long-Term Assets	$4.399B	$4.311B	$4.016B
YoY Change	7.86%	7.36%	9.63%
TOTAL ASSETS
Total Short-Term Assets	$423.1M	$537.7M	$576.2M
Total Long-Term Assets	$4.399B	$4.311B	$4.016B
Total Assets	$4.822B	$4.849B	$4.592B
YoY Change	6.3%	5.6%	13.26%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$93.56M	$107.9M	$111.2M
YoY Change	-7.7%	-2.94%	-14.86%
Accrued Expenses	$19.98M	$18.41M	$14.79M
YoY Change	51.66%	24.5%	21.33%
Deferred Revenue
YoY Change
Short-Term Debt	$79.00M	$94.70M	$72.50M
YoY Change	92.68%	30.62%	-78.2%
Long-Term Debt Due	$866.0K	$869.0K	$240.7M
YoY Change	-99.64%	-99.64%	70906.49%
Total Short-Term Liabilities	$435.5M	$468.3M	$644.1M
YoY Change	-23.71%	-27.28%	-2.16%
LONG-TERM LIABILITIES
Long-Term Debt	$1.575B	$1.575B	$1.295B
YoY Change	21.64%	21.64%	23.92%
Other Long-Term Liabilities	$122.4M	$120.2M	$118.0M
YoY Change	-88.35%	1.9%	4.64%
Total Long-Term Liabilities	$1.697B	$1.695B	$1.413B
YoY Change	-27.64%	19.99%	22.05%
TOTAL LIABILITIES
Total Short-Term Liabilities	$435.5M	$468.3M	$644.1M
Total Long-Term Liabilities	$1.697B	$1.695B	$1.413B
Total Liabilities	$2.133B	$2.163B	$2.057B
YoY Change	-35.3%	5.18%	13.27%
SHAREHOLDERS EQUITY
Retained Earnings	$423.7M	$445.1M	$430.6M
YoY Change	2.25%	3.36%	8.53%
Common Stock	$929.5M	$905.2M	$824.3M
YoY Change	11.83%	9.81%	36.84%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.347B	$1.343B	$1.248B
YoY Change
Total Liabilities & Shareholders Equity	$4.822B	$4.849B	$4.592B
YoY Change	6.3%	5.6%	13.26%

Cashflow Statement

Concept	2024 Q2	2024 Q1	2023 Q1
OPERATING ACTIVITIES
Net Income	-$2.787M	$63.82M	$71.67M
YoY Change	-324.04%	-10.95%	27.44%
Depreciation, Depletion And Amortization	$33.76M	$33.10M	$31.47M
YoY Change	7.89%	5.19%	10.68%
Cash From Operating Activities	$121.0M	$125.0M	$176.9M
YoY Change	0.04%	-29.3%	25.4%
INVESTING ACTIVITIES
Capital Expenditures	$116.7M	$82.22M	$71.27M
YoY Change	58.58%	15.37%	-204.02%
Acquisitions		$0.00	$468.0K
YoY Change		-100.0%
Other Investing Activities	-$1.241M	-$729.0K	$1.285M
YoY Change	-74.8%	-156.73%	-10.2%
Cash From Investing Activities	-$118.0M	-$82.49M	-$73.02M
YoY Change	50.22%	12.97%	4.69%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net		$150.0M	$0.00
YoY Change
Cash From Financing Activities	-11.30M	-$2.917M	$11.19M
YoY Change	-73.95%	-126.07%	-117.82%
NET CHANGE
Cash From Operating Activities	121.0M	$125.0M	$176.9M
Cash From Investing Activities	-118.0M	-$82.49M	-$73.02M
Cash From Financing Activities	-11.30M	-$2.917M	$11.19M
Net Change In Cash	-8.219M	$39.63M	$115.0M
YoY Change	802.2%	-65.54%	1249.64%
FREE CASH FLOW
Cash From Operating Activities	$121.0M	$125.0M	$176.9M
Capital Expenditures	$116.7M	$82.22M	$71.27M
Free Cash Flow	$4.325M	$42.82M	$105.6M
YoY Change	-90.87%	-59.45%	-49.61%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2024Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2024Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2024
CY2024Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2024Q1	dei	Amendment Flag AmendmentFlag	false
CY2024Q1	dei	Entity Central Index Key EntityCentralIndexKey	0001733998
CY2024Q1	dei	Document Type DocumentType	10-Q
CY2024Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2024Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	82-4710680
CY2024Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	250 SW Taylor Street
CY2024Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	Portland
CY2024Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	OR
CY2024Q1	dei	Security12b Title Security12bTitle	Common Stock
CY2024Q1	dei	Trading Symbol TradingSymbol	NWN
CY2024Q1	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2024Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2024Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2024Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	38028137	shares
CY2024Q1	us-gaap	Revenues Revenues	433470000	usd
CY2023Q1	us-gaap	Revenues Revenues	462423000	usd
CY2024Q1	dei	Entity Registrant Name EntityRegistrantName	NORTHWEST NATURAL HOLDING COMPANY
CY2024Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	OR
CY2024Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2023Q1	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2024Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	38027266	shares
CY2024Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	38027266	shares
CY2023Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	35929228	shares
CY2024Q1	us-gaap	Other Receivable After Allowance For Credit Loss Related Party Type Extensible Enumeration OtherReceivableAfterAllowanceForCreditLossRelatedPartyTypeExtensibleEnumeration	http://fasb.org/srt/2023#AffiliatedEntityMember
CY2024Q1	us-gaap	Accounts Payable Related Party Type Extensible Enumeration AccountsPayableRelatedPartyTypeExtensibleEnumeration	http://fasb.org/srt/2023#AffiliatedEntityMember
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P9M
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P0Y
CY2024Q1	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	175717000	usd
CY2023Q1	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	205749000	usd
CY2024Q1	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	73614000	usd
CY2023Q1	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	71817000	usd
CY2024Q1	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	5746000	usd
CY2023Q1	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	5375000	usd
CY2024Q1	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	15468000	usd
CY2023Q1	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	14219000	usd
CY2024Q1	nwn	Excise Taxes ExciseTaxes	18244000	usd
CY2023Q1	nwn	Excise Taxes ExciseTaxes	19042000	usd
CY2024Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	33098000	usd
CY2023Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	31465000	usd
CY2024Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1756000	usd
CY2023Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1248000	usd
CY2024Q1	us-gaap	Operating Expenses OperatingExpenses	323643000	usd
CY2023Q1	us-gaap	Operating Expenses OperatingExpenses	348915000	usd
CY2024Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	109827000	usd
CY2023Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	113508000	usd
CY2024Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1134000	usd
CY2023Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1606000	usd
CY2024Q1	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-20531000	usd
CY2023Q1	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-18296000	usd
CY2024Q1	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	88162000	usd
CY2023Q1	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	96818000	usd
CY2024Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24339000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	25147000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	63823000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	71671000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-66000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-249000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	0	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	46000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	37000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	127000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	102000	usd
CY2024Q1	nwn	Unrealized Gain Loss On Derivative Tax UnrealizedGainLossOnDerivativeTax	-124	usd
CY2023Q1	nwn	Unrealized Gain Loss On Derivative Tax UnrealizedGainLossOnDerivativeTax	149	usd
CY2024Q1	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	346000	usd
CY2023Q1	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-411000	usd
CY2024Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	97204
CY2024Q1	dei	City Area Code CityAreaCode	(503)
CY2024Q1	dei	Local Phone Number LocalPhoneNumber	226-4211
CY2024Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	64047000	usd
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	71362000	usd
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	37765000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	35609000	shares
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	37796000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	35708000	shares
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.69
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.01
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.69
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.01
CY2024Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	72375000	usd
CY2023Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	140821000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	32920000	usd
CY2024Q1	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	128433000	usd
CY2023Q1	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	164157000	usd
CY2023Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	121341000	usd
CY2024Q1	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	57905000	usd
CY2023Q1	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	59542000	usd
CY2023Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	83138000	usd
CY2024Q1	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	4181000	usd
CY2023Q1	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	6760000	usd
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3455000	usd
CY2024Q1	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	127666000	usd
CY2023Q1	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	126546000	usd
CY2023Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	178270000	usd
CY2024Q1	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	5746000	usd
CY2023Q1	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	8507000	usd
CY2023Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	11380000	usd
CY2024Q1	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	99874000	usd
CY2023Q1	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	41392000	usd
CY2023Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	112571000	usd
CY2024Q1	us-gaap	Other Assets Current OtherAssetsCurrent	49896000	usd
CY2023Q1	us-gaap	Other Assets Current OtherAssetsCurrent	41968000	usd
CY2023Q4	us-gaap	Other Assets Current OtherAssetsCurrent	65275000	usd
CY2024Q1	us-gaap	Assets Current AssetsCurrent	537714000	usd
CY2023Q1	us-gaap	Assets Current AssetsCurrent	576173000	usd
CY2023Q4	us-gaap	Assets Current AssetsCurrent	601440000	usd
CY2024Q1	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4660104000	usd
CY2023Q1	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4320476000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4556609000	usd
CY2024Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1218580000	usd
CY2023Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1164498000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1198555000	usd
CY2024Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3441524000	usd
CY2023Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3155978000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3358054000	usd
CY2024Q1	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	309173000	usd
CY2023Q1	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	311419000	usd
CY2023Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	333443000	usd
CY2024Q1	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	3099000	usd
CY2023Q1	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	1432000	usd
CY2023Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	431000	usd
CY2024Q1	us-gaap	Other Long Term Investments OtherLongTermInvestments	84081000	usd
CY2023Q1	us-gaap	Other Long Term Investments OtherLongTermInvestments	93611000	usd
CY2023Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	102951000	usd
CY2024Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	70547000	usd
CY2023Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	72699000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	71308000	usd
CY2024Q1	us-gaap	Net Investment In Lease Noncurrent NetInvestmentInLeaseNoncurrent	128840000	usd
CY2023Q1	us-gaap	Net Investment In Lease Noncurrent NetInvestmentInLeaseNoncurrent	133159000	usd
CY2023Q4	us-gaap	Net Investment In Lease Noncurrent NetInvestmentInLeaseNoncurrent	129882000	usd
CY2024Q1	us-gaap	Goodwill Goodwill	162966000	usd
CY2023Q1	us-gaap	Goodwill Goodwill	149836000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	163344000	usd
CY2024Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	111122000	usd
CY2023Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	97789000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	106239000	usd
CY2024Q1	us-gaap	Assets Noncurrent AssetsNoncurrent	4311352000	usd
CY2023Q1	us-gaap	Assets Noncurrent AssetsNoncurrent	4015923000	usd
CY2023Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	4265652000	usd
CY2024Q1	us-gaap	Assets Assets	4849066000	usd
CY2023Q1	us-gaap	Assets Assets	4592096000	usd
CY2023Q4	us-gaap	Assets Assets	4867092000	usd
CY2024Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	94700000	usd
CY2023Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	72500000	usd
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	89780000	usd
CY2024Q1	us-gaap	Long Term Debt Current LongTermDebtCurrent	869000	usd
CY2023Q1	us-gaap	Long Term Debt Current LongTermDebtCurrent	240712000	usd
CY2023Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	150865000	usd
CY2024Q1	us-gaap	Accounts Payable Current AccountsPayableCurrent	107888000	usd
CY2023Q1	us-gaap	Accounts Payable Current AccountsPayableCurrent	111152000	usd
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	145361000	usd
CY2024Q1	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	27031000	usd
CY2023Q1	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	31372000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	15454000	usd
CY2024Q1	us-gaap	Interest Payable Current InterestPayableCurrent	16360000	usd
CY2023Q1	us-gaap	Interest Payable Current InterestPayableCurrent	13089000	usd
CY2023Q4	us-gaap	Interest Payable Current InterestPayableCurrent	15836000	usd
CY2024Q1	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	77659000	usd
CY2023Q1	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	57523000	usd
CY2023Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	84962000	usd
CY2024Q1	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	52677000	usd
CY2023Q1	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	44370000	usd
CY2023Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	98661000	usd
CY2024Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2053000	usd
CY2023Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1700000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2333000	usd
CY2024Q1	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	89107000	usd
CY2023Q1	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	71662000	usd
CY2023Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	93626000	usd
CY2024Q1	us-gaap	Liabilities Current LiabilitiesCurrent	468344000	usd
CY2023Q1	us-gaap	Liabilities Current LiabilitiesCurrent	644080000	usd
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	696878000	usd
CY2024Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1574735000	usd
CY2023Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1294590000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1425435000	usd
CY2024Q1	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	394068000	usd
CY2023Q1	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	376237000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	382673000	usd
CY2024Q1	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	700703000	usd
CY2023Q1	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	669328000	usd
CY2023Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	695896000	usd
CY2024Q1	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	157812000	usd
CY2023Q1	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	147890000	usd
CY2023Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	158116000	usd
CY2024Q1	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	12743000	usd
CY2023Q1	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	15382000	usd
CY2023Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	28055000	usd
CY2024Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	77051000	usd
CY2023Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	78302000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	77167000	usd
CY2024Q1	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	120224000	usd
CY2023Q1	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	117980000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	119034000	usd
CY2024Q1	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	1462601000	usd
CY2023Q1	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	1405119000	usd
CY2023Q4	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	1460941000	usd
CY2024Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2024Q1	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	37631212	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	37631212	shares
CY2024Q1	us-gaap	Common Stock Value CommonStockValue	905153000	usd
CY2023Q1	us-gaap	Common Stock Value CommonStockValue	824304000	usd
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	890976000	usd
CY2024Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	445058000	usd
CY2023Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	430597000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	399911000	usd
CY2024Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6825000	usd
CY2023Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6594000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7049000	usd
CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	1343386000	usd
CY2023Q1	us-gaap	Stockholders Equity StockholdersEquity	1248307000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	1283838000	usd
CY2024Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4849066000	usd
CY2023Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4592096000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4867092000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1283838000	usd
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1175441000	usd
CY2024Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1343386000	usd
CY2023Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1248307000	usd
CY2024Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.4875
CY2023Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.4850
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	63823000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	71671000	usd
CY2024Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	33098000	usd
CY2023Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	31465000	usd
CY2024Q1	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	546000	usd
CY2023Q1	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	833000	usd
CY2024Q1	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	8041000	usd
CY2023Q1	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	5228000	usd
CY2024Q1	us-gaap	Pension Expense PensionExpense	1082000	usd
CY2023Q1	us-gaap	Pension Expense PensionExpense	-791000	usd
CY2024Q1	us-gaap	Other Increase Decrease In Environmental Liabilities OtherIncreaseDecreaseInEnvironmentalLiabilities	-6264000	usd
CY2023Q1	us-gaap	Other Increase Decrease In Environmental Liabilities OtherIncreaseDecreaseInEnvironmentalLiabilities	-4113000	usd
CY2024Q1	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	5746000	usd
CY2023Q1	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	5375000	usd
CY2024Q1	nwn	Asset Optimization Revenue Sharing Bill Credits AssetOptimizationRevenueSharingBillCredits	-20608000	usd
CY2023Q1	nwn	Asset Optimization Revenue Sharing Bill Credits AssetOptimizationRevenueSharingBillCredits	-10471000	usd
CY2024Q1	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-8905000	usd
CY2023Q1	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-8509000	usd
CY2024Q1	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-17839000	usd
CY2023Q1	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-38727000	usd
CY2024Q1	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-13070000	usd
CY2023Q1	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-46129000	usd
CY2024Q1	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	21796000	usd
CY2023Q1	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	25567000	usd
CY2024Q1	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-30930000	usd
CY2023Q1	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-47773000	usd
CY2024Q1	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	8808000	usd
CY2023Q1	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	11300000	usd
CY2024Q1	nwn	Increase Decrease In Asset Optimization Revenue Sharing IncreaseDecreaseInAssetOptimizationRevenueSharing	108000	usd
CY2023Q1	nwn	Increase Decrease In Asset Optimization Revenue Sharing IncreaseDecreaseInAssetOptimizationRevenueSharing	-7769000	usd
CY2024Q1	nwn	Change In Decoupling Regulatory Deferral ChangeInDecouplingRegulatoryDeferral	-6427000	usd
CY2023Q1	nwn	Change In Decoupling Regulatory Deferral ChangeInDecouplingRegulatoryDeferral	1303000	usd
CY2024Q1	nwn	Increase Decrease In Cloud Based Software Operating Assets IncreaseDecreaseInCloudBasedSoftwareOperatingAssets	6485000	usd
CY2023Q1	nwn	Increase Decrease In Cloud Based Software Operating Assets IncreaseDecreaseInCloudBasedSoftwareOperatingAssets	3673000	usd
CY2024Q1	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-13335000	usd
CY2023Q1	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-958000	usd
CY2024Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-4534000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-14054000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	125039000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	176861000	usd
CY2024Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	82217000	usd
CY2023Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	71265000	usd
CY2024Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	usd
CY2023Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	468000	usd
CY2024Q1	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	1000000	usd
CY2023Q1	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	usd
CY2024Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-729000	usd
CY2023Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1285000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-82488000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-73018000	usd
CY2024Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	12218000	usd
CY2023Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	16669000	usd
CY2024Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	150000000	usd
CY2023Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	200000000	usd
CY2024Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	150000000	usd
CY2023Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	usd
CY2024Q1	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	4920000	usd
CY2023Q1	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-185700000	usd
CY2024Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	17746000	usd
CY2023Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	16532000	usd
CY2024Q1	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	748000	usd
CY2023Q1	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1498000	usd
CY2024Q1	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1314000	usd
CY2023Q1	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1312000	usd
CY2024Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-247000	usd
CY2023Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-440000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-2917000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	11187000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	39634000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	115030000	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
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	89258000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	155994000	usd
CY2024Q1	us-gaap	Interest Paid Net InterestPaidNet	18044000	usd
CY2023Q1	us-gaap	Interest Paid Net InterestPaidNet	14904000	usd
CY2024Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1000000	usd
CY2023Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1300000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-66000	usd
CY2024Q1	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	127666000	usd
CY2023Q1	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	126546000	usd
CY2023Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	178270000	usd
CY2024Q1	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	309173000	usd
CY2023Q1	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	311419000	usd
CY2023Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	333443000	usd
CY2024Q1	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	77659000	usd
CY2023Q1	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	57523000	usd
CY2023Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	84962000	usd
CY2024Q1	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	700703000	usd
CY2023Q1	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	669328000	usd
CY2023Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	695896000	usd
CY2024Q1	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	48800000	usd
CY2023Q1	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	112600000	usd
CY2024Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	72375000	usd
CY2023Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	140821000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	32920000	usd
CY2024Q1	us-gaap	Restricted Cash Current RestrictedCashCurrent	16883000	usd
CY2023Q1	us-gaap	Restricted Cash Current RestrictedCashCurrent	15173000	usd
CY2023Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	16704000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	89258000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	155994000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	49624000	usd
CY2024Q1	nwn	Inactive Account Period Outstanding Prior To Write Off InactiveAccountPeriodOutstandingPriorToWriteOff	P120D
CY2024Q1	nwn	General Payment Term Of Ngd Receivables GeneralPaymentTermOfNGDReceivables	P15D
CY2024Q1	nwn	Age Of Closed Or Inactive Accounts AgeOfClosedOrInactiveAccounts	P120D
CY2024Q1	nwn	Number Of Net Investments In Sales Type Leases NumberOfNetInvestmentsInSalesTypeLeases	2	numberofleases
CY2024Q1	us-gaap	Sales Type Lease Net Investment In Lease Allowance For Credit Loss SalesTypeLeaseNetInvestmentInLeaseAllowanceForCreditLoss	0	usd
CY2024Q1	nwn	Cci Deferred Costs CCIDeferredCosts	24000000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	63823000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	71671000	usd
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	37765000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	35609000	shares
CY2024Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	31000	shares
CY2023Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	99000	shares
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	37796000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	35708000	shares
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.69
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.01
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.69
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.01
CY2024Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	15000	shares
CY2023Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1000	shares
CY2024Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	427219000	usd
CY2024Q1	us-gaap	Revenues Revenues	433470000	usd
CY2023Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	466777000	usd
CY2023Q1	us-gaap	Revenues Revenues	462423000	usd
CY2024Q1	us-gaap	Lessor Sales Type Lease Term Of Contract1 LessorSalesTypeLeaseTermOfContract1	P30Y
CY2024Q1	us-gaap	Lessor Sales Type Lease Renewal Term1 LessorSalesTypeLeaseRenewalTerm1	P50Y
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	77200000	usd
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	15900000	usd
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	20500000	usd
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	16100000	usd
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	7800000	usd
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	3900000	usd
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	13000000	usd
CY2024Q1	us-gaap	Lessor Sales Type Lease Term Of Contract1 LessorSalesTypeLeaseTermOfContract1	P30Y
CY2024Q1	us-gaap	Lessor Sales Type Lease Renewal Term1 LessorSalesTypeLeaseRenewalTerm1	P50Y
CY2024Q1	us-gaap	Lease Income LeaseIncome	100000	usd
CY2023Q1	us-gaap	Lease Income LeaseIncome	200000	usd
CY2024Q1	us-gaap	Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	491000	usd
CY2024Q1	nwn	Lease Paymentstobe Received Remainderof Fiscal Year LeasePaymentstobeReceivedRemainderofFiscalYear	12391000	usd
CY2024Q1	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	652000	usd
CY2024Q1	nwn	Lease Paymentstobe Received Two Years LeasePaymentstobeReceivedTwoYears	15958000	usd
CY2024Q1	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	92000	usd
CY2024Q1	nwn	Lease Paymentstobe Received Three Years LeasePaymentstobeReceivedThreeYears	14993000	usd
CY2024Q1	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	79000	usd
CY2024Q1	nwn	Lease Paymentstobe Received Four Years LeasePaymentstobeReceivedFourYears	14600000	usd
CY2024Q1	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	58000	usd
CY2024Q1	nwn	Lease Paymentstobe Received Five Years LeasePaymentstobeReceivedFiveYears	14041000	usd
CY2024Q1	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	800000	usd
CY2024Q1	nwn	Lease Paymentstobe Received Thereafter LeasePaymentstobeReceivedThereafter	209018000	usd
CY2024Q1	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	2172000	usd
CY2024Q1	nwn	Lease Paymentstobe Received LeasePaymentstobeReceived	281001000	usd
CY2024Q1	us-gaap	Residual Value Of Leased Asset ResidualValueOfLeasedAsset	5600000	usd
CY2023Q1	us-gaap	Residual Value Of Leased Asset ResidualValueOfLeasedAsset	5200000	usd
CY2023Q4	us-gaap	Residual Value Of Leased Asset ResidualValueOfLeasedAsset	5500000	usd
CY2024Q1	nwn	Lessee Operating Lease Maximum Term Of Short Term Leases Not Recorded On The Balance Sheet LesseeOperatingLeaseMaximumTermOfShortTermLeasesNotRecordedOnTheBalanceSheet	P12M
CY2024Q1	us-gaap	Operating Lease Expense OperatingLeaseExpense	1907000	usd
CY2023Q1	us-gaap	Operating Lease Expense OperatingLeaseExpense	1815000	usd
CY2024Q1	us-gaap	Short Term Lease Cost ShortTermLeaseCost	81000	usd
CY2023Q1	us-gaap	Short Term Lease Cost ShortTermLeaseCost	80000	usd
CY2024Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	70547000	usd
CY2023Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	72699000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	71308000	usd
CY2024Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2053000	usd
CY2023Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1700000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2333000	usd
CY2024Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	77051000	usd
CY2023Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	78302000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	77167000	usd
CY2024Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	79104000	usd
CY2023Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	80002000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	79500000	usd
CY2024Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P16Y
CY2023Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P17Y
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P16Y2M12D
CY2024Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.073
CY2023Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.073
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.073
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	5811000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	7538000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	7514000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	7645000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	7725000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	101278000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	137511000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	58407000	usd
CY2024Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	79104000	usd
CY2024Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2053000	usd
CY2024Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	77051000	usd
CY2024Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	1855000	usd
CY2023Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	1806000	usd
CY2024Q1	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	97000	usd
CY2023Q1	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	173000	usd
CY2024Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	97000	usd
CY2023Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	263000	usd
CY2024Q1	us-gaap	Finance Lease Liability FinanceLeaseLiability	0	usd
CY2024Q1	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	2700000	usd
CY2023Q1	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	2400000	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	2600000	usd
CY2024Q1	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	0	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	0	usd
CY2024Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	94700000	usd
CY2023Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	72500000	usd
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	89800000	usd
CY2024Q1	us-gaap	Other Long Term Debt OtherLongTermDebt	6500000	usd
CY2023Q1	us-gaap	Other Long Term Debt OtherLongTermDebt	6000000.0	usd
CY2023Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	6600000	usd
CY2024Q1	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1586200000	usd
CY2023Q1	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1545700000	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1586300000	usd
CY2024Q1	nwn	Long Term Debt Current Maturities Gross LongTermDebtCurrentMaturitiesGross	900000	usd
CY2023Q1	nwn	Long Term Debt Current Maturities Gross LongTermDebtCurrentMaturitiesGross	240700000	usd
CY2023Q4	nwn	Long Term Debt Current Maturities Gross LongTermDebtCurrentMaturitiesGross	150900000	usd
CY2024Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1574700000	usd
CY2023Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1294600000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1425400000	usd
CY2024Q1	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1586189000	usd
CY2023Q1	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1545730000	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1586344000	usd
CY2024Q1	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	10585000	usd
CY2023Q1	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	10428000	usd
CY2023Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	10044000	usd
CY2024Q1	us-gaap	Long Term Debt LongTermDebt	1575604000	usd
CY2023Q1	us-gaap	Long Term Debt LongTermDebt	1535302000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	1576300000	usd
CY2024Q1	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	1425765000	usd
CY2023Q1	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	1395321000	usd
CY2023Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	1447941000	usd
CY2024Q1	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	0	usd
CY2024Q1	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Remainder Of Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear	20600000	usd
CY2024Q1	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3500000	usd
CY2023Q1	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3400000	usd
CY2024Q1	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	18514000	usd
CY2023Q1	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	20332000	usd
CY2024Q1	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	7577000	usd
CY2023Q1	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	8149000	usd
CY2024Q1	nwn	Other Tax Expense Benefitdifferencestobeflowedthroughbyregulatorycommissions OtherTaxExpenseBenefitdifferencestobeflowedthroughbyregulatorycommissions	-1579000	usd
CY2023Q1	nwn	Other Tax Expense Benefitdifferencestobeflowedthroughbyregulatorycommissions OtherTaxExpenseBenefitdifferencestobeflowedthroughbyregulatorycommissions	-2909000	usd
CY2024Q1	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-173000	usd
CY2023Q1	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-425000	usd
CY2024Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24339000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	25147000	usd
CY2024Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.276
CY2023Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.260
CY2024Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3441524000	usd
CY2023Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3155978000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3358054000	usd
CY2024Q1	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	45937000	usd
CY2023Q1	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	47666000	usd
CY2023Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	45713000	usd
CY2024Q1	us-gaap	Inventory Gas In Storage Underground Noncurrent InventoryGasInStorageUndergroundNoncurrent	20406000	usd
CY2023Q1	us-gaap	Inventory Gas In Storage Underground Noncurrent InventoryGasInStorageUndergroundNoncurrent	22229000	usd
CY2023Q4	us-gaap	Inventory Gas In Storage Underground Noncurrent InventoryGasInStorageUndergroundNoncurrent	20893000	usd
CY2024Q1	us-gaap	Equity Method Investment Aggregate Cost EquityMethodInvestmentAggregateCost	17738000	usd
CY2023Q1	us-gaap	Equity Method Investment Aggregate Cost EquityMethodInvestmentAggregateCost	23716000	usd
CY2023Q4	us-gaap	Equity Method Investment Aggregate Cost EquityMethodInvestmentAggregateCost	36345000	usd
CY2024Q1	us-gaap	Other Long Term Investments OtherLongTermInvestments	84081000	usd
CY2023Q1	us-gaap	Other Long Term Investments OtherLongTermInvestments	93611000	usd
CY2023Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	102951000	usd
CY2024Q1	nwn	Total Cumulative Gas Reserves Investment TotalCumulativeGasReservesInvestment	188000000	usd
CY2024Q1	nwn	Deferred Taxes Related To Gas Reserves DeferredTaxesRelatedToGasReserves	3800000	usd
CY2023Q1	nwn	Deferred Taxes Related To Gas Reserves DeferredTaxesRelatedToGasReserves	4400000	usd
CY2023Q4	nwn	Deferred Taxes Related To Gas Reserves DeferredTaxesRelatedToGasReserves	4000000	usd
CY2024Q1	us-gaap	Deferred Gas Cost DeferredGasCost	2200000	usd
CY2023Q1	us-gaap	Deferred Gas Cost DeferredGasCost	3300000	usd
CY2023Q4	us-gaap	Deferred Gas Cost DeferredGasCost	2300000	usd
	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	5	numberofconnections
	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	22800000	usd
CY2024Q1	us-gaap	Goodwill Goodwill	163000000	usd
CY2023Q1	us-gaap	Goodwill Goodwill	149800000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	163300000	usd
CY2024Q1	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2024Q1	us-gaap	Derivative Loss On Derivative DerivativeLossOnDerivative	50500000	usd
CY2024Q1	us-gaap	Derivative Gain On Derivative DerivativeGainOnDerivative	172400000	usd
CY2024Q1	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	300000	usd
CY2024Q1	us-gaap	Derivative Fair Value Of Derivative Net DerivativeFairValueOfDerivativeNet	-57300000	usd
CY2023Q1	us-gaap	Derivative Fair Value Of Derivative Net DerivativeFairValueOfDerivativeNet	-49900000	usd
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Net DerivativeFairValueOfDerivativeNet	-115200000	usd
CY2024Q1	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	500000	usd
CY2023Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	200000	usd
CY2024Q1	us-gaap	Derivative Instruments Gain Reclassified From Accumulated Oci Into Income Effective Portion DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion	400000	usd
CY2024Q1	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	27388000	usd
CY2023Q1	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	25187000	usd
CY2023Q4	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	32454000	usd
CY2024Q1	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	86071000	usd
CY2023Q1	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	89110000	usd
CY2023Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	89173000	usd
CY2023Q4	nwn	Remediation Nonrecovery Percentage RemediationNonrecoveryPercentage	0.033
CY2024Q1	nwn	Remediation Nonrecovery Percentage RemediationNonrecoveryPercentage	0.033
CY2023Q1	nwn	Remediation Nonrecovery Percentage RemediationNonrecoveryPercentage	0.033
CY2024Q1	nwn	Annual Tariff Rider Collection AnnualTariffRiderCollection	5000000	usd
CY2024Q1	nwn	Annual Tariff Rider Collection AnnualTariffRiderCollection	5000000	usd
CY2024Q1	nwn	Annual Insurance Proceedsto Apply Against Remediation Costs AnnualInsuranceProceedstoApplyAgainstRemediationCosts	5000000	usd
CY2024Q1	nwn	Total Annual Remediation Expenseand Interest TotalAnnualRemediationExpenseandInterest	10000000	usd
CY2024Q1	dei	Entity File Number EntityFileNumber	1-38681
CY2024Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2024Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2024Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2024Q1	dei	Entity Shell Company EntityShellCompany	false
CY2024Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2023Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2023Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	35929228	shares

Files In Submission

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$NWN
Northwest Natural Holding Co Stock $nwn

2024 Q2 Form 10-Q Financial Statement

#000173399824000075 Filed on May 06, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWN Northwest Natural Holding Co Stock $nwn

2024 Q2 Form 10-Q Financial Statement

#000173399824000075 Filed on May 06, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWN
Northwest Natural Holding Co Stock $nwn