$ATKR
Atkore Inc. Stock $atkr

$atkr Overview Financials Valuation SEC Filings Company Website

2024 Q4 Form 10-K Financial Statement

#000166613824000164 Filed on November 21, 2024

Income Statement

Concept	2024 Q4	2024 Q3	2024
Revenue		$788.3M	$3.202B
YoY Change		-9.38%	-9.0%
Cost Of Revenue		$572.2M	$2.124B
YoY Change		0.67%	-2.53%
Gross Profit		$216.1M	$1.078B
YoY Change		-28.34%	-19.53%
Gross Profit Margin		27.41%	33.66%
Selling, General & Admin		$100.4M	$397.5M
YoY Change		3.5%	2.41%
% of Gross Profit		46.47%	36.88%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization		$32.61M	$121.0M
YoY Change		5.88%	4.76%
% of Gross Profit		15.09%	11.23%
Operating Expenses		$114.0M	$397.5M
YoY Change		1.7%	2.41%
Operating Profit		$102.1M	$624.8M
YoY Change		-46.11%	-30.07%
Interest Expense		-$9.321M	-$35.58M
YoY Change		3.57%	1.0%
% of Operating Profit		-9.13%	-5.7%
Other Income/Expense, Net		-$275.0K	-$1.963M
YoY Change		175.0%	-75.37%
Pretax Income		$91.88M	$587.2M
YoY Change		-49.1%	-30.94%
Income Tax		$18.76M	$114.4M
% Of Pretax Income		20.42%	19.48%
Net Earnings		$72.29M	$472.9M
YoY Change		-47.88%	-31.46%
Net Earnings / Revenue		9.17%	14.77%
Basic Earnings Per Share			$12.83
Diluted Earnings Per Share		$2.03	$12.69
COMMON SHARES
Basic Shares Outstanding	34.90M shares	35.86M shares	36.39M shares
Diluted Shares Outstanding			36.79M shares

Balance Sheet

Concept	2024 Q3	2024
SHORT-TERM ASSETS
Cash & Short-Term Investments	$351.4M	$351.4M
YoY Change	-9.46%	-9.46%
Cash & Equivalents	$351.4M	$351.4M
Short-Term Investments
Other Short-Term Assets	$158.4M	$158.4M
YoY Change	63.79%	63.79%
Inventory	$524.7M	$524.7M
Prepaid Expenses
Receivables	$489.9M	$489.9M
Other Receivables	$0.00	$0.00
Total Short-Term Assets	$1.524B	$1.524B
YoY Change	-0.92%	-0.92%
LONG-TERM ASSETS
Property, Plant & Equipment	$652.1M	$832.7M
YoY Change	16.64%	22.5%
Goodwill	$314.0M
YoY Change	0.93%
Intangibles	$340.4M
YoY Change	-13.68%
Long-Term Investments
YoY Change
Other Assets	$9.281M	$9.835M
YoY Change	-13.32%	-12.96%
Total Long-Term Assets	$1.497B	$1.497B
YoY Change	7.2%	7.2%
TOTAL ASSETS
Total Short-Term Assets	$1.524B	$1.524B
Total Long-Term Assets	$1.497B	$1.497B
Total Assets	$3.021B	$3.021B
YoY Change	2.94%	2.94%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$262.2M	$262.2M
YoY Change	-10.43%	-10.42%
Accrued Expenses	$173.1M	$173.1M
YoY Change	-5.02%	-5.02%
Deferred Revenue	$108.8M
YoY Change	-10.52%
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due	$2.491M	$2.491M
YoY Change	107.58%	107.58%
Total Short-Term Liabilities	$510.9M	$510.9M
YoY Change	-9.52%	-9.52%
LONG-TERM LIABILITIES
Long-Term Debt	$764.8M	$772.4M
YoY Change	0.28%	1.07%
Other Long-Term Liabilities	$14.90M	$171.7M
YoY Change	26.93%	48.26%
Total Long-Term Liabilities	$779.7M	$944.1M
YoY Change	0.69%	7.28%
TOTAL LIABILITIES
Total Short-Term Liabilities	$510.9M	$510.9M
Total Long-Term Liabilities	$779.7M	$944.1M
Total Liabilities	$1.482B	$1.482B
YoY Change	1.0%	1.0%
SHAREHOLDERS EQUITY
Retained Earnings	$1.049B
YoY Change	5.48%
Common Stock	$509.6M
YoY Change	0.48%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.540B	$1.540B
YoY Change
Total Liabilities & Shareholders Equity	$3.021B	$3.021B
YoY Change	2.94%	2.94%

Cashflow Statement

Concept	2024 Q3	2024
OPERATING ACTIVITIES
Net Income	$72.29M	$472.9M
YoY Change	-47.88%	-31.46%
Depreciation, Depletion And Amortization	$32.61M	$121.0M
YoY Change	5.88%	4.76%
Cash From Operating Activities	$199.1M	$549.0M
YoY Change	-18.38%	-32.02%
INVESTING ACTIVITIES
Capital Expenditures	$44.76M	$149.9M
YoY Change	-53.57%	-31.54%
Acquisitions		$6.036M
YoY Change		-92.76%
Other Investing Activities	$1.104M	-$4.475M
YoY Change	1004.0%	-94.63%
Cash From Investing Activities	-$43.66M	-$154.3M
YoY Change	-54.66%	-48.92%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$398.9M
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-110.7M	-$435.3M
YoY Change	47.19%	-14.11%
NET CHANGE
Cash From Operating Activities	199.1M	$549.0M
Cash From Investing Activities	-43.66M	-$154.3M
Cash From Financing Activities	-110.7M	-$435.3M
Net Change In Cash	44.73M	-$36.73M
YoY Change	-38.22%	5665.93%
FREE CASH FLOW
Cash From Operating Activities	$199.1M	$549.0M
Capital Expenditures	$44.76M	$149.9M
Free Cash Flow	$154.3M	$399.2M
YoY Change	4.62%	-32.2%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2024	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1963000	usd
CY2024	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	587237000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	850290000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1203620000	usd
CY2024	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	114365000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	160391000	usd
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	13916000	usd
CY2023	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	7481000	usd
CY2024	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	31920000	usd
CY2024	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	587237000	usd
CY2024	dei	Entity Central Index Key EntityCentralIndexKey	0001666138
CY2024	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2024
CY2024	dei	Amendment Flag AmendmentFlag	false
CY2024	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2024	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	90-0631463
CY2024	dei	Entity Address City Or Town EntityAddressCityOrTown	Harvey
CY2024	dei	Entity Address State Or Province EntityAddressStateOrProvince	IL
CY2024	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	60426
CY2024	dei	City Area Code CityAreaCode	708
CY2024	dei	Local Phone Number LocalPhoneNumber	339-1610
CY2024	dei	Security12b Title Security12bTitle	Common stock, par value $0.01 per share
CY2024	dei	Trading Symbol TradingSymbol	ATKR
CY2024	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2024	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2024	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2024	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2024	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2024	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2024	dei	Entity Small Business EntitySmallBusiness	false
CY2024	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2024	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2024	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2024	dei	Entity Shell Company EntityShellCompany	false
CY2024Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	34902992	shares
CY2024	dei	Auditor Firm AuditorFirmId	34
CY2024	dei	Auditor Name AuditorName	DELOITTE & TOUCHE LLP
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3913949000	usd
CY2024	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2124214000	usd
CY2023	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2179260000	usd
CY2022	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2273924000	usd
CY2024	us-gaap	Gross Profit GrossProfit	1077839000	usd
CY2023	us-gaap	Gross Profit GrossProfit	1339501000	usd
CY2022	us-gaap	Gross Profit GrossProfit	1640025000	usd
CY2024	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	397544000	usd
CY2023	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	388206000	usd
CY2022	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	370044000	usd
CY2024	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	55511000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	57804000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	36176000	usd
CY2024	us-gaap	Operating Income Loss OperatingIncomeLoss	624784000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	893491000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	1233805000	usd
CY2023	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-35232000	usd
CY2022	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-30676000	usd
CY2022	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-23943000	usd
CY2023Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	37317893	shares
CY2024	dei	Entity File Number EntityFileNumber	001-37793
CY2024	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-35584000	usd
CY2024	us-gaap	Share Based Compensation ShareBasedCompensation	20300000	usd
CY2024	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-1076000	usd
CY2024	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023Q3	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseRightOfUseAssetNet
CY2024Q3	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseRightOfUseAssetNet
CY2024Q3	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseRightOfUseAssetNet
CY2023Q3	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseRightOfUseAssetNet
CY2023Q3	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseLiabilityCurrent
CY2024Q3	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseLiabilityCurrent
CY2023Q3	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseLiabilityCurrent
CY2024Q3	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseLiabilityCurrent
CY2024Q3	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseLiabilityNoncurrent
CY2023Q3	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseLiabilityNoncurrent
CY2023Q3	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseLiabilityNoncurrent
CY2024Q3	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://atkore.com/20240930#OperatingAndFinanceLeaseLiabilityNoncurrent
CY2024	us-gaap	Defined Benefit Plan Type Extensible List DefinedBenefitPlanTypeExtensibleList	http://fasb.org/us-gaap/2024#PensionPlansDefinedBenefitMember
CY2024	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost Credit Excluding Service Cost Statement Of Income Or Comprehensive Income Extensible List DefinedBenefitPlanNetPeriodicBenefitCostCreditExcludingServiceCostStatementOfIncomeOrComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2024#OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
CY2022	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost Credit Excluding Service Cost Statement Of Income Or Comprehensive Income Extensible List DefinedBenefitPlanNetPeriodicBenefitCostCreditExcludingServiceCostStatementOfIncomeOrComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2024#OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
CY2023	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost Credit Excluding Service Cost Statement Of Income Or Comprehensive Income Extensible List DefinedBenefitPlanNetPeriodicBenefitCostCreditExcludingServiceCostStatementOfIncomeOrComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2024#OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
CY2024	dei	Document Annual Report DocumentAnnualReport	true
CY2024	dei	Document Period End Date DocumentPeriodEndDate	2024-09-30
CY2024	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2024	dei	Document Transition Report DocumentTransitionReport	false
CY2024	dei	Entity Registrant Name EntityRegistrantName	Atkore Inc.
CY2024	dei	Entity Address Address Line1 EntityAddressAddressLine1	16100 South Lathrop Avenue
CY2024Q1	dei	Entity Public Float EntityPublicFloat	6600000000	usd
CY2024	dei	Auditor Location AuditorLocation	Chicago, Illinois
CY2024	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3202053000	usd
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3518761000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-7969000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	490000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	290186000	usd
CY2024	us-gaap	Net Income Loss NetIncomeLoss	472872000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	689899000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	913434000	usd
CY2024	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	12.83
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	17.51
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	20.56
CY2024	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	12.69
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	17.27
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	20.30
CY2024	us-gaap	Net Income Loss NetIncomeLoss	472872000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	689899000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	913434000	usd
CY2024	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	14453000	usd
CY2023	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	10212000	usd
CY2024	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-393000	usd
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-5994000	usd
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-2523000	usd
CY2024	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	14846000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	16206000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-21420000	usd
CY2024	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	487718000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	706105000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	892014000	usd
CY2024Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	351385000	usd
CY2023Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	388114000	usd
CY2024Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	6322000	usd
CY2023Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	5179000	usd
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CY2023Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	559854000	usd
CY2024Q3	us-gaap	Inventory Net InventoryNet	524695000	usd
CY2023Q3	us-gaap	Inventory Net InventoryNet	493852000	usd
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CY2023Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	96670000	usd
CY2024Q3	us-gaap	Assets Current AssetsCurrent	1524388000	usd
CY2023Q3	us-gaap	Assets Current AssetsCurrent	1538490000	usd
CY2024Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	652093000	usd
CY2023Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	559041000	usd
CY2024Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	340431000	usd
CY2023Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	394372000	usd
CY2024Q3	us-gaap	Goodwill Goodwill	314000000	usd
CY2023Q3	us-gaap	Goodwill Goodwill	311106000	usd
CY2024Q3	atkr	Operating And Finance Lease Right Of Use Asset Net OperatingAndFinanceLeaseRightOfUseAssetNet	180656000	usd
CY2023Q3	atkr	Operating And Finance Lease Right Of Use Asset Net OperatingAndFinanceLeaseRightOfUseAssetNet	120747000	usd
CY2024Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	554000	usd
CY2023Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	546000	usd
CY2024Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	9281000	usd
CY2023Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	10707000	usd
CY2024Q3	us-gaap	Assets Assets	3021403000	usd
CY2023Q3	us-gaap	Assets Assets	2935009000	usd
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CY2023Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	292734000	usd
CY2024Q3	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	2000000	usd
CY2023Q3	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	6322000	usd
CY2024Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	44723000	usd
CY2023Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	45576000	usd
CY2024Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	108782000	usd
CY2023Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	121576000	usd
CY2024Q3	atkr	Operating And Finance Lease Liability Current OperatingAndFinanceLeaseLiabilityCurrent	22038000	usd
CY2023Q3	atkr	Operating And Finance Lease Liability Current OperatingAndFinanceLeaseLiabilityCurrent	16230000	usd
CY2024Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	71122000	usd
CY2023Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	82166000	usd
CY2024Q3	us-gaap	Liabilities Current LiabilitiesCurrent	510866000	usd
CY2023Q3	us-gaap	Liabilities Current LiabilitiesCurrent	564604000	usd
CY2024Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	764838000	usd
CY2023Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	762687000	usd
CY2024Q3	atkr	Operating And Finance Lease Liability Noncurrent OperatingAndFinanceLeaseLiabilityNoncurrent	164328000	usd
CY2023Q3	atkr	Operating And Finance Lease Liability Noncurrent OperatingAndFinanceLeaseLiabilityNoncurrent	105517000	usd
CY2024Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	26574000	usd
CY2023Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	22346000	usd
CY2024Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	14897000	usd
CY2023Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	11736000	usd
CY2024Q3	us-gaap	Liabilities Liabilities	1481503000	usd
CY2023Q3	us-gaap	Liabilities Liabilities	1466890000	usd
CY2024Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2024Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2024Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	34859033	shares
CY2024Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	34859033	shares
CY2023Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	37317893	shares
CY2024Q3	us-gaap	Common Stock Value CommonStockValue	350000	usd
CY2023Q3	us-gaap	Common Stock Value CommonStockValue	374000	usd
CY2024Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	509254000	usd
CY2023Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	506783000	usd
CY2024Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1049390000	usd
CY2023Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	994902000	usd
CY2024Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-19094000	usd
CY2023Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-33940000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	1539900000	usd
CY2023Q3	us-gaap	Stockholders Equity StockholdersEquity	1468119000	usd
CY2024Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3021403000	usd
CY2023Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2935009000	usd
CY2024	us-gaap	Net Income Loss NetIncomeLoss	472872000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	689899000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	913434000	usd
CY2024	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	121018000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	115524000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	84415000	usd
CY2024	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2151000	usd
CY2023	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2151000	usd
CY2022	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2151000	usd
CY2024	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3369000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12860000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3054000	usd
CY2024	atkr	Provisionfor Doubtful Accountsand Inventory Writedown ProvisionforDoubtfulAccountsandInventoryWritedown	5096000	usd
CY2023	atkr	Provisionfor Doubtful Accountsand Inventory Writedown ProvisionforDoubtfulAccountsandInventoryWritedown	5269000	usd
CY2022	atkr	Provisionfor Doubtful Accountsand Inventory Writedown ProvisionforDoubtfulAccountsandInventoryWritedown	10235000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	21101000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	17245000	usd
CY2024	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	30194000	usd
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	20321000	usd
CY2022	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	4850000	usd
CY2024	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-72732000	usd
CY2023	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	30278000	usd
CY2022	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-17749000	usd
CY2023	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	42419000	usd
CY2022	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	160980000	usd
CY2024	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	18610000	usd
CY2023	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	11152000	usd
CY2022	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	21718000	usd
CY2024	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-37558000	usd
CY2023	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	32298000	usd
CY2022	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-28968000	usd
CY2024	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-46163000	usd
CY2023	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-3088000	usd
CY2022	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-92802000	usd
CY2024	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-48691000	usd
CY2023	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-10176000	usd
CY2022	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	27198000	usd
CY2024	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-5319000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	2157000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	2944000	usd
CY2024	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	549033000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	807634000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	786835000	usd
CY2024	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	149861000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	218888000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	135776000	usd
CY2024	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1561000	usd
CY2023	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	123000	usd
CY2022	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	779000	usd
CY2024	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	6036000	usd
CY2023	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	83385000	usd
CY2022	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	307805000	usd
CY2024	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-154336000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-302150000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-442802000	usd
CY2024	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-17824000	usd
CY2023	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-14428000	usd
CY2022	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-24045000	usd
CY2024	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	381040000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	491033000	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	500161000	usd
CY2024	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1957000	usd
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1320000	usd
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	usd
CY2024	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	34461000	usd
CY2023	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	0	usd
CY2022	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	0	usd
CY2024	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-435282000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-506781000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-524206000	usd
CY2024	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3856000	usd
CY2023	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	661000	usd
CY2022	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-7365000	usd
CY2024	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-36729000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-637000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-187538000	usd
CY2023Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	388114000	usd
CY2022Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	388751000	usd
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	576289000	usd
CY2024Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	351385000	usd
CY2023Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	388114000	usd
CY2022Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	388751000	usd
CY2024	us-gaap	Interest Paid Net InterestPaidNet	47099000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	43670000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	30529000	usd
CY2024	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	66369000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	150934000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	379769000	usd
CY2024	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	12848000	usd
CY2023	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	7893000	usd
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	8653000	usd
CY2024	atkr	Acquisitions Of Businesses Not Yet Paid AcquisitionsOfBusinessesNotYetPaid	0	usd
CY2023	atkr	Acquisitions Of Businesses Not Yet Paid AcquisitionsOfBusinessesNotYetPaid	13625000	usd
CY2022	atkr	Acquisitions Of Businesses Not Yet Paid AcquisitionsOfBusinessesNotYetPaid	12628000	usd
CY2024	atkr	Operating Cash Flows From Cash Paid On Operating Lease Liabilities OperatingCashFlowsFromCashPaidOnOperatingLeaseLiabilities	18526000	usd
CY2023	atkr	Operating Cash Flows From Cash Paid On Operating Lease Liabilities OperatingCashFlowsFromCashPaidOnOperatingLeaseLiabilities	15155000	usd
CY2022	atkr	Operating Cash Flows From Cash Paid On Operating Lease Liabilities OperatingCashFlowsFromCashPaidOnOperatingLeaseLiabilities	12549000	usd
CY2024	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	73294000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	63644000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	38794000	usd
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	864736000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	913434000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-21420000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	17245000	usd
CY2022	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-24045000	usd
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	500161000	usd
CY2022Q3	us-gaap	Stockholders Equity StockholdersEquity	1249787000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	689899000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	16206000	usd
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	21101000	usd
CY2023	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-14432000	usd
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	494442000	usd
CY2023	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	0	usd
CY2023Q3	us-gaap	Stockholders Equity StockholdersEquity	1468119000	usd
CY2024	us-gaap	Net Income Loss NetIncomeLoss	472872000	usd
CY2024	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	14846000	usd
CY2024	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	20300000	usd
CY2024	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-17825000	usd
CY2024	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	383951000	usd
CY2024	us-gaap	Dividends Common Stock DividendsCommonStock	34461000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	1539900000	usd
CY2024Q3	atkr	Common Stock Voting Rights Number Of Vote For Each Share CommonStockVotingRightsNumberOfVoteForEachShare	1	vote
CY2021Q4	srt	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	400000000	usd
CY2022Q2	srt	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	800000000	usd
CY2024	us-gaap	Fiscal Period FiscalPeriod	<span style="color:#000000;font-family:'Montserrat SemiBold',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Fiscal Periods</span><span style="color:#000000;font-family:'Montserrat Light',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%"> </span>— The Company has a fiscal year that ends on September 30. The Company's fiscal quarters typically end on the last Friday in December, March and June as it follows a 4-5-4 calendar.
CY2024	us-gaap	Use Of Estimates UseOfEstimates	<span style="color:#000000;font-family:'Montserrat SemiBold',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Use of Estimates</span><span style="color:#000000;font-family:'Montserrat Light',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%"> </span>— The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclose contingent assets and liabilities at the date of the consolidated financial statements and report the associated amounts of revenues and expenses. Actual results could differ materially from these estimates.
CY2024	atkr	Increase Decrease Of Revenue Economic Value Of Tax Credits To Be Transferred IncreaseDecreaseOfRevenueEconomicValueOfTaxCreditsToBeTransferred	68738000	usd
CY2024	atkr	Benefit To Tax Provision Related To Tax Credits BenefitToTaxProvisionRelatedToTaxCredits	83999000	usd
CY2024Q3	atkr	Liability For Credits To Be Transferred LiabilityForCreditsToBeTransferred	22489000	usd
CY2023	us-gaap	Number Of Reporting Units NumberOfReportingUnits	6	reportingunit
CY2022	us-gaap	Number Of Reporting Units NumberOfReportingUnits	6	reportingunit
CY2024	us-gaap	Number Of Reporting Units NumberOfReportingUnits	6	reportingunit
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	1721000	usd
CY2024	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	usd
CY2023	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	usd
CY2022	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	usd
CY2024Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	171047000	usd
CY2023Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	117966000	usd
CY2024Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	15009000	usd
CY2023Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	7108000	usd
CY2024Q3	atkr	Operating And Finance Lease Right Of Use Asset Gross OperatingAndFinanceLeaseRightOfUseAssetGross	186056000	usd
CY2023Q3	atkr	Operating And Finance Lease Right Of Use Asset Gross OperatingAndFinanceLeaseRightOfUseAssetGross	125074000	usd
CY2024Q3	atkr	Operating And Finance Lease Right Of Use Asset Accumulated Amortization OperatingAndFinanceLeaseRightOfUseAssetAccumulatedAmortization	5400000	usd
CY2023Q3	atkr	Operating And Finance Lease Right Of Use Asset Accumulated Amortization OperatingAndFinanceLeaseRightOfUseAssetAccumulatedAmortization	4327000	usd
CY2024Q3	atkr	Operating And Finance Lease Right Of Use Asset Net OperatingAndFinanceLeaseRightOfUseAssetNet	180656000	usd
CY2023Q3	atkr	Operating And Finance Lease Right Of Use Asset Net OperatingAndFinanceLeaseRightOfUseAssetNet	120747000	usd
CY2024Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	19547000	usd
CY2023Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	15030000	usd
CY2024Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	2491000	usd
CY2023Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	1200000	usd
CY2024Q3	atkr	Operating And Finance Lease Liability Current OperatingAndFinanceLeaseLiabilityCurrent	22038000	usd
CY2023Q3	atkr	Operating And Finance Lease Liability Current OperatingAndFinanceLeaseLiabilityCurrent	16230000	usd
CY2024Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	156788000	usd
CY2023Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	104047000	usd
CY2024Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	7540000	usd
CY2023Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	1470000	usd
CY2024Q3	atkr	Operating And Finance Lease Liability Noncurrent OperatingAndFinanceLeaseLiabilityNoncurrent	164328000	usd
CY2023Q3	atkr	Operating And Finance Lease Liability Noncurrent OperatingAndFinanceLeaseLiabilityNoncurrent	105517000	usd
CY2024Q3	atkr	Operating And Finance Lease Liability OperatingAndFinanceLeaseLiability	186366000	usd
CY2023Q3	atkr	Operating And Finance Lease Liability OperatingAndFinanceLeaseLiability	121747000	usd
CY2024	atkr	Operating And Finance Lease Right Of Use Asset Amortization OperatingAndFinanceLeaseRightOfUseAssetAmortization	32169000	usd
CY2023	atkr	Operating And Finance Lease Right Of Use Asset Amortization OperatingAndFinanceLeaseRightOfUseAssetAmortization	21540000	usd
CY2024	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	308000	usd
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	131000	usd
CY2024	us-gaap	Variable Lease Cost VariableLeaseCost	2914000	usd
CY2023	us-gaap	Variable Lease Cost VariableLeaseCost	3146000	usd
CY2024	us-gaap	Short Term Lease Cost ShortTermLeaseCost	3873000	usd
CY2023	us-gaap	Short Term Lease Cost ShortTermLeaseCost	2451000	usd
CY2024	us-gaap	Lease Cost LeaseCost	39264000	usd
CY2023	us-gaap	Lease Cost LeaseCost	27269000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	3011000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	30133000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2570000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	33074000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	1958000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	30887000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	1513000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	25266000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	1063000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	22649000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	1497000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	92018000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	11612000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	234027000	usd
CY2024Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	1581000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	57692000	usd
CY2024Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	10031000	usd
CY2024Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	176335000	usd
CY2024Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y2M12D
CY2023Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y6M
CY2024Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P4Y10M24D
CY2023Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y6M
CY2024Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.064
CY2023Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.064
CY2024Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.060
CY2023Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.046
CY2022	atkr	Transaction Costs TransactionCosts	3424000	usd
CY2022Q3	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	31100000	usd
CY2024	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	4060993000	usd
CY2023	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	3048378000	usd
CY2024	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	920022000	usd
CY2023	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	584754000	usd
CY2024	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	5264000	usd
CY2023	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	5175000	usd
CY2022	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2958000	usd
CY2024	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	3364000	usd
CY2023	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	5027000	usd
CY2022	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	5392000	usd
CY2024	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-266000	usd
CY2023	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-667000	usd
CY2022	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-631000	usd
CY2024	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	2166000	usd
CY2023	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	815000	usd
CY2022	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1803000	usd
CY2024	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.058
CY2023	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.054
CY2022	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.027
CY2024	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.033
CY2023	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.050
CY2022	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.040
CY2022Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	101202000	usd
CY2023	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	5175000	usd
CY2023	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-4882000	usd
CY2023	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	6165000	usd
CY2023Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	95330000	usd
CY2024	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	5264000	usd
CY2024	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	8979000	usd
CY2024	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	6384000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	103189000	usd
CY2022Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	103925000	usd
CY2023	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	7463000	usd
CY2023	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	220000	usd
CY2023	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	6165000	usd
CY2023Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	105443000	usd
CY2024	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	12599000	usd
CY2024	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	276000	usd
CY2024	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	6384000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	111934000	usd
CY2023Q3	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	10113000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	8745000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	8745000	usd
CY2023Q3	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	10113000	usd
CY2024Q3	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	0	usd
CY2023Q3	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	0	usd
CY2024Q3	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	8745000	usd
CY2023Q3	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	10113000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	-15108000	usd
CY2023Q3	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	-15631000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	15108000	usd
CY2023Q3	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	15631000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.049
CY2023Q3	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.058
CY2024Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	0	usd
CY2023Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	0	usd
CY2024Q3	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Plan Assets DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets	0	usd
CY2023Q3	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Plan Assets DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets	0	usd
CY2024Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	0	usd
CY2023Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	0	usd
CY2024Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	0	usd
CY2023Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	0	usd
CY2024Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2023Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2024Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	111934000	usd
CY2023Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	105443000	usd
CY2024	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	276000	usd
CY2023	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	220000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	379000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	7134000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	7289000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	7340000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	7375000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	7418000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	36931000	usd
CY2024	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	6396000	usd
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5483000	usd
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4615000	usd
CY2024Q3	us-gaap	Multiemployer Plans Withdrawal Obligation MultiemployerPlansWithdrawalObligation	3974000	usd
CY2023Q3	us-gaap	Multiemployer Plans Withdrawal Obligation MultiemployerPlansWithdrawalObligation	4336000	usd
CY2024	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1619000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2706000	usd
CY2022	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1634000	usd
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	769000	shares
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	19.95
CY2021Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	10.89
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	51441000	usd
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	42000	shares
CY2022	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	105.94
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	49.39
CY2022	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	98000	shares
CY2022	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	12.58
CY2022	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue	9.84
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	8703000	usd
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2022	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0
CY2022Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	713000	shares
CY2022Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	26.00
CY2022Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	13.29
CY2022Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	38062000	usd
CY2022	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y2M19D
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	51000	shares
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	101.66
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	54.06
CY2023	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	74000	shares
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	13.26
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue	9.56
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	9201000	usd
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0
CY2023Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	690000	shares
CY2023Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	32.93
CY2023Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	16.69
CY2023Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	80152000	usd
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P9Y9M
CY2024	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2024	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2024	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0
CY2024	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	253000	shares
CY2024	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	18.46
CY2024	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue	10.78
CY2024	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	33270000	usd
CY2024	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	12000	shares
CY2024	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	103.67
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	425000	shares
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	39.59
CY2024Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	19.23
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	20584000	usd
CY2024	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P11Y6M7D
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	383000	shares
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	32.68
CY2024Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	20584000	usd
CY2024	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P6Y8M23D
CY2024Q3	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	130.56
CY2023Q3	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	101.66
CY2022Q3	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	105.94
CY2024	atkr	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Dividends ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDividends	1000	shares
CY2024	atkr	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Dividend Value Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDividendValueWeightedAverageGrantDateFairValue	126.08
CY2024	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	0	usd
CY2023	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	0	usd
CY2022	us-gaap	Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	4379000	usd
CY2024	atkr	Foreign Exchange Gain Loss On Intercompany Loans ForeignExchangeGainLossOnIntercompanyLoans	-132000	usd
CY2023	atkr	Foreign Exchange Gain Loss On Intercompany Loans ForeignExchangeGainLossOnIntercompanyLoans	88000	usd
CY2022	atkr	Foreign Exchange Gain Loss On Intercompany Loans ForeignExchangeGainLossOnIntercompanyLoans	-5342000	usd
CY2024	us-gaap	Pension Expense PensionExpense	1098000	usd
CY2023	us-gaap	Pension Expense PensionExpense	579000	usd
CY2022	us-gaap	Pension Expense PensionExpense	-1803000	usd
CY2024	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	733000	usd
CY2023	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	7477000	usd
CY2022	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	usd
CY2024	atkr	Other Nonoperating Income Loss Miscellaneous OtherNonoperatingIncomeLossMiscellaneous	0	usd
CY2023	atkr	Other Nonoperating Income Loss Miscellaneous OtherNonoperatingIncomeLossMiscellaneous	-1000	usd
CY2022	atkr	Other Nonoperating Income Loss Miscellaneous OtherNonoperatingIncomeLossMiscellaneous	-350000	usd
CY2024	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1963000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-7969000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	490000	usd
CY2024	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	733000	usd
CY2023	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	7477000	usd
CY2024	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	545826000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	817853000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1174109000	usd
CY2024	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	41411000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	32437000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	29511000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	850290000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1203620000	usd
CY2024	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	82125000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	110714000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	228141000	usd
CY2024	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	16012000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	25556000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	49793000	usd
CY2024	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	12859000	usd
CY2023	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	11261000	usd
CY2022	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	9198000	usd
CY2024	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	110996000	usd
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	147531000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	287132000	usd
CY2024	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	4100000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	12670000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	3174000	usd
CY2024	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	351000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1274000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	753000	usd
CY2024	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1082000	usd
CY2023	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1085000	usd
CY2022	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-873000	usd
CY2024	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3369000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12860000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3054000	usd
CY2024	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	114365000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	160391000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	290186000	usd
CY2024	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2024	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.02
CY2023	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.03
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.03
CY2024	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.02
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.01
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.01
CY2024	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.05
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0
CY2024	atkr	Effective Income Tax Rate Reconciliation Non Deductible Executive Compensation EffectiveIncomeTaxRateReconciliationNonDeductibleExecutiveCompensation	0.01
CY2023	atkr	Effective Income Tax Rate Reconciliation Non Deductible Executive Compensation EffectiveIncomeTaxRateReconciliationNonDeductibleExecutiveCompensation	0
CY2022	atkr	Effective Income Tax Rate Reconciliation Non Deductible Executive Compensation EffectiveIncomeTaxRateReconciliationNonDeductibleExecutiveCompensation	0
CY2024	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	-0.03
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0
CY2024	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.01
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.01
CY2024	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.19
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.19
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.24
CY2024	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	12805000	usd
CY2024	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	18972000	usd
CY2024	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	13773000	usd
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	21630000	usd
CY2023	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	39493000	usd
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	39759000	usd
CY2022	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	6996000	usd
CY2022	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	11438000	usd
CY2024Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	39232000	usd
CY2023Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	42824000	usd
CY2024Q3	atkr	Deferred Tax Assets Operating Loss And Tax Credit Carryforwards DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards	20436000	usd
CY2023Q3	atkr	Deferred Tax Assets Operating Loss And Tax Credit Carryforwards DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards	20648000	usd
CY2024Q3	us-gaap	Deferred Tax Assets In Process Research And Development DeferredTaxAssetsInProcessResearchAndDevelopment	8446000	usd
CY2023Q3	us-gaap	Deferred Tax Assets In Process Research And Development DeferredTaxAssetsInProcessResearchAndDevelopment	3626000	usd
CY2024Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	14274000	usd
CY2023Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	21256000	usd
CY2024Q3	atkr	Deferred Tax Assets Lease Obligations DeferredTaxAssetsLeaseObligations	46179000	usd
CY2023Q3	atkr	Deferred Tax Assets Lease Obligations DeferredTaxAssetsLeaseObligations	29722000	usd
CY2024Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1121000	usd
CY2023Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1060000	usd
CY2024Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	129688000	usd
CY2023Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	119136000	usd
CY2024Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	40373000	usd
CY2023Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	37814000	usd
CY2024Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	43487000	usd
CY2023Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	49084000	usd
CY2024Q3	atkr	Deferred Tax Assets Rou Asset Net DeferredTaxAssetsROUAssetNet	44722000	usd
CY2023Q3	atkr	Deferred Tax Assets Rou Asset Net DeferredTaxAssetsROUAssetNet	29583000	usd
CY2024Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	6609000	usd
CY2023Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	5376000	usd
CY2024Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	135191000	usd
CY2023Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	121857000	usd
CY2024Q3	atkr	Deferred Tax Assets Net Of Deferred Tax Liabilities Before Valuation Allowance DeferredTaxAssetsNetOfDeferredTaxLiabilitiesBeforeValuationAllowance	5503000	usd
CY2023Q3	atkr	Deferred Tax Assets Net Of Deferred Tax Liabilities Before Valuation Allowance DeferredTaxAssetsNetOfDeferredTaxLiabilitiesBeforeValuationAllowance	2721000	usd
CY2024Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	20517000	usd
CY2023Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	19079000	usd
CY2024Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	26020000	usd
CY2023Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	21800000	usd
CY2024Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3367000	usd
CY2023Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2581000	usd
CY2024Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	516000	usd
CY2023Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	236000	usd
CY2021Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3333000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	322000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	342000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	3012000	usd
CY2022Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	985000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	75000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1792000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	121000	usd
CY2023Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2581000	usd
CY2024	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	84000	usd
CY2024	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1287000	usd
CY2024	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	585000	usd
CY2024Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3367000	usd
CY2024	atkr	Unrecognized Tax Benefits Increase Decrease Resulting From Current Period And Current Period Tax Positions UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromCurrentPeriodAndCurrentPeriodTaxPositions	1370000	usd
CY2024	atkr	Unrecognized Tax Benefits Increase Decrease Resulting From Current And Prior Period UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromCurrentAndPriorPeriod	-585000	usd
CY2024	atkr	Unrecognized Tax Benefits Income Tax Penalties And Interest Period Increase Decrease UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestPeriodIncreaseDecrease	281000	usd
CY2023	atkr	Unrecognized Tax Benefits Increase Decrease Resulting From Current Period And Current Period Tax Positions UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromCurrentPeriodAndCurrentPeriodTaxPositions	1792000	usd
CY2023	atkr	Unrecognized Tax Benefits Increase Decrease Resulting From Current And Prior Period UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromCurrentAndPriorPeriod	-196000	usd
CY2023	atkr	Unrecognized Tax Benefits Income Tax Penalties And Interest Period Increase Decrease UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestPeriodIncreaseDecrease	158000	usd
CY2022	atkr	Unrecognized Tax Benefits Increase Decrease Resulting From Current Period And Current Period Tax Positions UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromCurrentPeriodAndCurrentPeriodTaxPositions	-3012000	usd
CY2022	atkr	Unrecognized Tax Benefits Increase Decrease Resulting From Current And Prior Period UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromCurrentAndPriorPeriod	664000	usd
CY2022	atkr	Unrecognized Tax Benefits Income Tax Penalties And Interest Period Increase Decrease UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestPeriodIncreaseDecrease	-183000	usd
CY2024	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	0	usd
CY2024Q3	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	163154000	usd
CY2024	us-gaap	Net Income Loss NetIncomeLoss	472872000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	689899000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	913434000	usd
CY2024	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	6135000	usd
CY2023	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	10637000	usd
CY2022	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	14460000	usd
CY2024	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	466737000	usd
CY2024	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	466737000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	679262000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	679262000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	898974000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	898974000	usd
CY2024	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36390000	shares
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	38797000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43717000	shares
CY2024	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	399000	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	531000	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	563000	shares
CY2024	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36789000	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39328000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44280000	shares
CY2024	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	12.83
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	17.51
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	20.56
CY2024	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	12.69
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	17.27
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	20.30
CY2023	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	15705000	usd
CY2023	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-501000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	16206000	usd
CY2024	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	14453000	usd
CY2024	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	14646000	usd
CY2024	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-200000	usd
CY2024	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	14846000	usd
CY2024Q3	us-gaap	Percentage Of Lifo Inventory PercentageOfLIFOInventory	0.81
CY2023Q3	us-gaap	Percentage Of Lifo Inventory PercentageOfLIFOInventory	0.82
CY2024Q3	atkr	Inventory Raw Materials And Purchased Parts Net Of Valuation Reserves InventoryRawMaterialsAndPurchasedPartsNetOfValuationReserves	153290000	usd
CY2023Q3	atkr	Inventory Raw Materials And Purchased Parts Net Of Valuation Reserves InventoryRawMaterialsAndPurchasedPartsNetOfValuationReserves	231518000	usd
CY2024Q3	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	74158000	usd
CY2023Q3	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	60524000	usd
CY2024Q3	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	297247000	usd
CY2023Q3	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	201810000	usd
CY2024Q3	us-gaap	Inventory Net InventoryNet	524695000	usd
CY2023Q3	us-gaap	Inventory Net InventoryNet	493852000	usd
CY2024Q3	atkr	Fifo Inventory Higher Lower Than Reported FIFOInventoryHigherLowerThanReported	-14425000	usd
CY2023Q3	atkr	Fifo Inventory Higher Lower Than Reported FIFOInventoryHigherLowerThanReported	29826000	usd
CY2024	us-gaap	Effect Of Lifo Inventory Liquidation On Income EffectOfLIFOInventoryLiquidationOnIncome	370000	usd
CY2023	us-gaap	Effect Of Lifo Inventory Liquidation On Income EffectOfLIFOInventoryLiquidationOnIncome	2394000	usd
CY2024Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	29176000	usd
CY2023Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	25585000	usd
CY2024Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1147023000	usd
CY2023Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	994698000	usd
CY2024Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	494930000	usd
CY2023Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	435657000	usd
CY2024Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	652093000	usd
CY2023Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	559041000	usd
CY2024	us-gaap	Depreciation Depreciation	65507000	usd
CY2023	us-gaap	Depreciation Depreciation	57720000	usd
CY2022	us-gaap	Depreciation Depreciation	48239000	usd
CY2022Q3	us-gaap	Goodwill Goodwill	289330000	usd
CY2023	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	18683000	usd
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	1721000	usd
CY2023	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	1989000	usd
CY2023	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	2825000	usd
CY2023Q3	us-gaap	Goodwill Goodwill	311106000	usd
CY2024	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	2894000	usd
CY2024Q3	us-gaap	Goodwill Goodwill	314000000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	644285000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	396667000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	247618000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	640029000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	338464000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	301565000	usd
CY2024Q3	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	737098000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	396667000	usd
CY2024Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	340431000	usd
CY2023Q3	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	732835000	usd
CY2023Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	338464000	usd
CY2023Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	394372000	usd
CY2024	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	55511000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	57804000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	36176000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	42908000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	41149000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	39974000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	29477000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	28325000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	65789000	usd
CY2024Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	7114000	usd
CY2023Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	8980000	usd
CY2024Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	764838000	usd
CY2023Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	762687000	usd
CY2024Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	usd
CY2024Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	usd
CY2024Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	usd
CY2024Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	373000000	usd
CY2024Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	usd
CY2024Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	400000000	usd
CY2024Q3	us-gaap	Long Term Debt LongTermDebt	773000000	usd
CY2024Q3	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	103168000	usd
CY2024Q3	us-gaap	Purchase Obligation Due In Second Year PurchaseObligationDueInSecondYear	2200000	usd
CY2024Q3	us-gaap	Purchase Obligation Due In Third Year PurchaseObligationDueInThirdYear	8800000	usd
CY2024	us-gaap	Segment Expenditure Addition To Long Lived Assets SegmentExpenditureAdditionToLongLivedAssets	149861000	usd
CY2023	us-gaap	Segment Expenditure Addition To Long Lived Assets SegmentExpenditureAdditionToLongLivedAssets	218888000	usd
CY2022	us-gaap	Segment Expenditure Addition To Long Lived Assets SegmentExpenditureAdditionToLongLivedAssets	135776000	usd
CY2024Q3	us-gaap	Assets Assets	3021403000	usd
CY2023Q3	us-gaap	Assets Assets	2935009000	usd
CY2022Q3	us-gaap	Assets Assets	2598996000	usd
CY2024	atkr	Selling General And Administrative Expense Unallocated SellingGeneralAndAdministrativeExpenseUnallocated	46610000	usd
CY2023	atkr	Selling General And Administrative Expense Unallocated SellingGeneralAndAdministrativeExpenseUnallocated	65956000	usd
CY2022	atkr	Selling General And Administrative Expense Unallocated SellingGeneralAndAdministrativeExpenseUnallocated	70010000	usd
CY2024	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	121018000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	115524000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	84415000	usd
CY2024	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-35584000	usd
CY2023	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-35232000	usd
CY2022	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-30676000	usd
CY2024	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20300000	usd
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	21101000	usd
CY2022	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17245000	usd
CY2024	atkr	Transaction Costs TransactionCosts	140000	usd
CY2023	atkr	Transaction Costs TransactionCosts	968000	usd
CY2022	atkr	Transaction Costs TransactionCosts	3424000	usd
CY2024	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-733000	usd
CY2023	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-7477000	usd
CY2022	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	usd
CY2024	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-6701000	usd
CY2023	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-11535000	usd
CY2022	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-2410000	usd
CY2024	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	587237000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	850290000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1203620000	usd
CY2024Q3	us-gaap	Noncurrent Assets NoncurrentAssets	832749000	usd
CY2023Q3	us-gaap	Noncurrent Assets NoncurrentAssets	679788000	usd
CY2022Q3	us-gaap	Noncurrent Assets NoncurrentAssets	461255000	usd
CY2024	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3202053000	usd
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3518761000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3913949000	usd
CY2024	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3202053000	usd
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3518761000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3913949000	usd
CY2024Q3	atkr	Employees Covered By Collective Bargaining Arrangement Percentage EmployeesCoveredByCollectiveBargainingArrangementPercentage	0.20
CY2020Q3	atkr	Employees Covered By Collective Bargaining Arrangement Number EmployeesCoveredByCollectiveBargainingArrangementNumber	1121	employee
CY2024	dei	Auditor Name AuditorName	DELOITTE & TOUCHE LLP
CY2024Q3	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2024Q3	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2024Q3	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2024Q3	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2024	ecd	Insider Trd Policies Proc Adopted Flag InsiderTrdPoliciesProcAdoptedFlag	true
CY2024	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	34461000	usd
CY2023	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	0	usd
CY2022	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	0	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	500161000	usd
CY2014Q2	atkr	Payments For Repurchase Of Common Stock Excluding Related Expense PaymentsForRepurchaseOfCommonStockExcludingRelatedExpense	250000000	usd

Files In Submission

Name	View Source	Status
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$ATKR
Atkore Inc. Stock $atkr

2024 Q4 Form 10-K Financial Statement

#000166613824000164 Filed on November 21, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ATKR Atkore Inc. Stock $atkr

2024 Q4 Form 10-K Financial Statement

#000166613824000164 Filed on November 21, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ATKR
Atkore Inc. Stock $atkr