$ATKR
Atkore Inc. Stock $atkr

$atkr Overview Financials Valuation SEC Filings Company Website

2018 Q3 Form 10-K Financial Statement

#000166613819000094 Filed on November 22, 2019

Income Statement

Concept	2018 Q3	2018 Q2	2018 Q1
Revenue	$477.6M	$498.0M	$445.0M
YoY Change	20.66%	25.21%	19.37%
Cost Of Revenue	$365.8M	$377.7M	$335.8M
YoY Change	19.43%	23.73%	17.76%
Gross Profit	$111.7M	$120.3M	$109.2M
YoY Change	24.82%	30.11%	24.6%
Gross Profit Margin	23.4%	24.16%	24.53%
Selling, General & Admin	$56.50M	$57.48M	$60.12M
YoY Change	27.83%	35.28%	16.23%
% of Gross Profit	50.57%	47.77%	55.07%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$17.60M	$16.19M	$15.85M
YoY Change	21.38%	21.37%	19.44%
% of Gross Profit	15.75%	13.46%	14.52%
Operating Expenses	$64.50M	$57.48M	$60.12M
YoY Change	29.26%	35.28%	16.23%
Operating Profit	$47.23M	$55.15M	$41.27M
YoY Change	19.23%	24.08%	35.81%
Interest Expense	-$13.00M	-$12.44M	-$9.286M
YoY Change	106.35%	114.11%	77.52%
% of Operating Profit	-27.52%	-22.56%	-22.5%
Other Income/Expense, Net	$400.0K	$1.840M	$25.96M
YoY Change	0.0%	610.42%	322.15%
Pretax Income	$34.10M	$44.55M	$57.95M
YoY Change	3.33%	14.54%	85.08%
Income Tax	$1.400M	$10.35M	$15.39M
% Of Pretax Income	4.11%	23.24%	26.56%
Net Earnings	$32.70M	$34.20M	$42.56M
YoY Change	56.78%	24.52%	124.76%
Net Earnings / Revenue	6.85%	6.87%	9.56%
Basic Earnings Per Share	$0.69	$0.73	$0.83
Diluted Earnings Per Share	$0.66	$0.70	$0.79
COMMON SHARES
Basic Shares Outstanding	46.04M shares	46.26M shares	51.37M shares
Diluted Shares Outstanding		48.41M shares	54.00M shares

Balance Sheet

Concept	2018 Q3	2018 Q2	2018 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$126.7M	$109.5M	$76.90M
YoY Change	177.24%	13.83%	-1.28%
Cash & Equivalents	$126.7M	$109.5M	$76.89M
Short-Term Investments
Other Short-Term Assets	$33.60M	$26.90M	$29.80M
YoY Change	-5.62%	-16.98%	5.3%
Inventory	$221.8M	$207.5M	$202.5M
Prepaid Expenses
Receivables	$265.1M	$260.6M	$245.4M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$647.1M	$604.5M	$554.6M
YoY Change	27.95%	16.39%	13.76%
LONG-TERM ASSETS
Property, Plant & Equipment	$213.1M	$212.6M	$211.8M
YoY Change	2.15%	6.74%	8.4%
Goodwill	$170.1M	$170.3M	$169.1M
YoY Change	15.17%	43.4%	46.0%
Intangibles	$291.9M	$300.4M	$310.2M
YoY Change	-15.21%	20.63%	27.19%
Long-Term Investments
YoY Change
Other Assets	$1.800M	$6.500M	$6.400M
YoY Change	-79.31%	-17.72%	-20.0%
Total Long-Term Assets	$676.9M	$689.8M	$697.5M
YoY Change	-4.57%	19.98%	23.86%
TOTAL ASSETS
Total Short-Term Assets	$647.1M	$604.5M	$554.6M
Total Long-Term Assets	$676.9M	$689.8M	$697.5M
Total Assets	$1.324B	$1.294B	$1.252B
YoY Change	8.97%	18.27%	19.17%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$156.5M	$154.3M	$123.4M
YoY Change	24.6%	30.53%	9.48%
Accrued Expenses	$52.39M	$59.11M	$56.95M
YoY Change	-1.21%	32.45%	23.68%
Deferred Revenue	$3.377M
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$26.60M	$7.600M	$7.700M
YoY Change	533.33%	80.95%	83.33%
Total Short-Term Liabilities	$272.7M	$252.9M	$217.7M
YoY Change	28.75%	32.59%	17.62%
LONG-TERM LIABILITIES
Long-Term Debt	$877.7M	$898.5M	$900.6M
YoY Change	53.48%	84.15%	84.36%
Other Long-Term Liabilities	$16.54M	$20.26M	$23.86M
YoY Change	-21.41%	3.93%	32.46%
Total Long-Term Liabilities	$894.2M	$918.8M	$924.4M
YoY Change	50.82%	81.07%	82.52%
TOTAL LIABILITIES
Total Short-Term Liabilities	$272.7M	$252.9M	$217.7M
Total Long-Term Liabilities	$894.2M	$918.8M	$924.4M
Total Liabilities	$1.202B	$1.220B	$1.190B
YoY Change	40.71%	62.53%	59.96%
SHAREHOLDERS EQUITY
Retained Earnings	-$317.4M	-$348.5M	-$354.3M
YoY Change	647.94%	605.95%	361.2%
Common Stock	$458.5M	$444.4M	$435.3M
YoY Change	8.16%	5.71%	5.56%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.580M	$2.580M	$2.580M
YoY Change	0.0%	0.0%	0.0%
Treasury Stock Shares	260.9K shares	260.9K shares	260.9K shares
Shareholders Equity	$122.1M	$73.76M	$62.08M
YoY Change
Total Liabilities & Shareholders Equity	$1.324B	$1.294B	$1.252B
YoY Change	8.97%	18.27%	19.17%

Cashflow Statement

Concept	2018 Q3	2018 Q2	2018 Q1
OPERATING ACTIVITIES
Net Income	$32.70M	$34.20M	$42.56M
YoY Change	56.78%	24.52%	124.76%
Depreciation, Depletion And Amortization	$17.60M	$16.19M	$15.85M
YoY Change	21.38%	21.37%	19.44%
Cash From Operating Activities	$25.10M	$67.40M	$4.300M
YoY Change	-55.1%	65.6%	-160.56%
INVESTING ACTIVITIES
Capital Expenditures	-$12.20M	-$9.100M	-$9.000M
YoY Change	24.49%	31.88%	104.55%
Acquisitions
YoY Change
Other Investing Activities	$200.0K	$700.0K	$39.30M
YoY Change	-100.12%	-103.57%	39200.0%
Cash From Investing Activities	-$11.90M	-$8.500M	$30.40M
YoY Change	-93.16%	-67.92%	-790.91%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	5.100M	-25.10M	1.800M
YoY Change	-92.69%	-797.22%	50.0%
NET CHANGE
Cash From Operating Activities	25.10M	67.40M	4.300M
Cash From Investing Activities	-11.90M	-8.500M	30.40M
Cash From Financing Activities	5.100M	-25.10M	1.800M
Net Change In Cash	18.30M	33.80M	36.50M
YoY Change	-137.89%	89.89%	-454.37%
FREE CASH FLOW
Cash From Operating Activities	$25.10M	$67.40M	$4.300M
Capital Expenditures	-$12.20M	-$9.100M	-$9.000M
Free Cash Flow	$37.30M	$76.50M	$13.30M
YoY Change	-43.23%	60.71%	-592.59%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	us-gaap	Fiscal Period FiscalPeriod	<div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Fiscal Periods </span><span style="font-family:inherit;font-size:10pt;">— The Company has a fiscal year that ends on September 30. The Company's fiscal quarters end on the last Friday in December, March and June. </span></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div>
CY2017Q4	atkr	Effective Income Tax Rate Reconciliation Effectof Tax Cutsand Jobs Actof2017 Amount EffectiveIncomeTaxRateReconciliationEffectofTaxCutsandJobsActof2017Amount	4758000	USD
CY2019Q3	atkr	Number Of Employees Affected By Expiring Of Contracts NumberOfEmployeesAffectedByExpiringOfContracts	15	employee
CY2019	atkr	Number Of Years Cumulative Loss Position NumberOfYearsCumulativeLossPosition	P3Y
CY2019Q3	atkr	Numberof Employees Bargaining Unit Contract NumberofEmployeesBargainingUnitContract	400	employee
CY2014Q1	atkr	Paymentsfor Repurchaseof Common Stock Excluding Related Expense PaymentsforRepurchaseofCommonStockExcludingRelatedExpense	250000000	USD
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001666138
CY2018Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1762000	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2608000	USD
CY2018Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2018Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	47079645	shares
CY2019Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	46955163	shares
CY2018Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	47079645	shares
CY2019Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	46955163	shares
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-3356000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-1362000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	5253000	USD
CY2019Q1	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	50000000.0	USD
CY2019Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	50000000	USD
CY2018Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	260900	shares
CY2019Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	260900	shares
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-09-30
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	001-37793
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019	dei	Entity Registrant Name EntityRegistrantName	Atkore International Group Inc.
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	90-0631463
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	16100 South Lathrop Avenue
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Harvey
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	IL
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	60426
CY2019	dei	City Area Code CityAreaCode	708
CY2019	dei	Local Phone Number LocalPhoneNumber	339-1610
CY2019	dei	Security12b Title Security12bTitle	Common stock, par value $0.01 per share
CY2019	dei	Trading Symbol TradingSymbol	ATKR
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Registrant Name EntityRegistrantName	Atkore International Group Inc.
CY2019Q1	dei	Entity Public Float EntityPublicFloat	983100000	USD
CY2019Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	46983702	shares
CY2017Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	24389000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1916538000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1835139000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1503934000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1419338000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1397055000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1142664000	USD
CY2019	us-gaap	Gross Profit GrossProfit	497200000	USD
CY2018	us-gaap	Gross Profit GrossProfit	438084000	USD
CY2017	us-gaap	Gross Profit GrossProfit	361270000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	240660000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	226282000	USD
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	182910000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	32876000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	32104000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	22407000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	223664000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	179698000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	155953000	USD
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.59
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.33
CY2017	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	1221000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-50473000	USD
CY2018	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-40694000	USD
CY2017	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-26598000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-9805000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	11478000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	27348000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6575000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	184669000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	166352000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	126125000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	45618000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29707000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	41486000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.91
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.83
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.48
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2019	us-gaap	Net Income Loss NetIncomeLoss	139051000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	136645000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	84639000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-7490000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-2853000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	15437000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-4397000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-6747000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-22927000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1544000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7968000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	116124000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	138189000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	92607000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	123415000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	126662000	USD
CY2019Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	315353000	USD
CY2018Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	265147000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	226090000	USD
CY2018Q3	us-gaap	Inventory Net InventoryNet	221753000	USD
CY2019Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	34679000	USD
CY2018Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	33576000	USD
CY2019Q3	us-gaap	Assets Current AssetsCurrent	699537000	USD
CY2018Q3	us-gaap	Assets Current AssetsCurrent	647138000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	260703000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	213108000	USD
CY2019Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	285684000	USD
CY2018Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	291916000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	186231000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	170129000	USD
CY2019Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	577000	USD
CY2018Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	162000	USD
CY2019Q3	us-gaap	Nontrade Receivables Noncurrent NontradeReceivablesNoncurrent	4263000	USD
CY2018Q3	us-gaap	Nontrade Receivables Noncurrent NontradeReceivablesNoncurrent	1607000	USD
CY2019Q3	us-gaap	Assets Assets	1436995000	USD
CY2018Q3	us-gaap	Assets Assets	1324060000	USD
CY2019Q3	us-gaap	Debt Current DebtCurrent	0	USD
CY2018Q3	us-gaap	Debt Current DebtCurrent	26561000	USD
CY2019Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	150681000	USD
CY2018Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	156525000	USD
CY2019Q3	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	2157000	USD
CY2018Q3	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	542000	USD
CY2019Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	35770000	USD
CY2018Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	33350000	USD
CY2019Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	44983000	USD
CY2018Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	3377000	USD
CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	53943000	USD
CY2018Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	52392000	USD
CY2019Q3	us-gaap	Liabilities Current LiabilitiesCurrent	287534000	USD
CY2018Q3	us-gaap	Liabilities Current LiabilitiesCurrent	272747000	USD
CY2019Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	845317000	USD
CY2018Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	877686000	USD
CY2019Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	19986000	USD
CY2018Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	16510000	USD
CY2019Q3	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	3669000	USD
CY2018Q3	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	1443000	USD
CY2019Q3	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	34509000	USD
CY2018Q3	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	17075000	USD
CY2019Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	13044000	USD
CY2018Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	16540000	USD
CY2019Q3	us-gaap	Liabilities Liabilities	1204059000	USD
CY2018Q3	us-gaap	Liabilities Liabilities	1202001000	USD
CY2019Q3	us-gaap	Common Stock Value CommonStockValue	471000	USD
CY2018Q3	us-gaap	Common Stock Value CommonStockValue	472000	USD
CY2019Q3	us-gaap	Treasury Stock Value TreasuryStockValue	2580000	USD
CY2018Q3	us-gaap	Treasury Stock Value TreasuryStockValue	2580000	USD
CY2019Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	477139000	USD
CY2018Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	457978000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-200396000	USD
CY2018Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-317373000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-41698000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-16438000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	232936000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	122059000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1436995000	USD
CY2018Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1324060000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	139051000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	136645000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	84639000	USD
CY2019	atkr	Gain Losson Dispositionof Property Plant Equipmentand Disposal Group Not Discontinued Operation Gain Losson Disposal GainLossonDispositionofPropertyPlantEquipmentandDisposalGroupNotDiscontinuedOperationGainLossonDisposal	0	USD
CY2018	atkr	Gain Losson Dispositionof Property Plant Equipmentand Disposal Group Not Discontinued Operation Gain Losson Disposal GainLossonDispositionofPropertyPlantEquipmentandDisposalGroupNotDiscontinuedOperationGainLossonDisposal	27575000	USD
CY2017	atkr	Gain Losson Dispositionof Property Plant Equipmentand Disposal Group Not Discontinued Operation Gain Losson Disposal GainLossonDispositionofPropertyPlantEquipmentandDisposalGroupNotDiscontinuedOperationGainLossonDisposal	5093000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	72347000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	66890000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	54727000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1804000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1542000	USD
CY2017	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1446000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-796000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-9008000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	938000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-9805000	USD
CY2019	atkr	Provisionfor Doubtful Accountsand Inventory Writedown ProvisionforDoubtfulAccountsandInventoryWritedown	4656000	USD
CY2018	atkr	Provisionfor Doubtful Accountsand Inventory Writedown ProvisionforDoubtfulAccountsandInventoryWritedown	7241000	USD
CY2017	atkr	Provisionfor Doubtful Accountsand Inventory Writedown ProvisionforDoubtfulAccountsandInventoryWritedown	1333000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	11798000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	14664000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	12788000	USD
CY2019	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	7384000	USD
CY2018	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	0	USD
CY2017	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	0	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-1938000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	2023000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	896000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6026000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	44419000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	13445000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-2782000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1566000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-9002000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	36528000	USD
CY2017	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-9138000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	7243000	USD
CY2017	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-11232000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	10301000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3054000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1762000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3074000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-21981000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	31667000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	8673000	USD
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	4511000	USD
CY2018	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-3179000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-259000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1308000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	209694000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	145703000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	121654000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	34860000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	38501000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	25122000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	80000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	349000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	100000	USD
CY2019	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	42631000	USD
CY2017	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2019	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	0	USD
CY2018	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	0	USD
CY2017	us-gaap	Proceeds From Sale Of Property Held For Sale ProceedsFromSaleOfPropertyHeldForSale	3024000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	97999000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	3467000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	183923000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	322000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1502000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-88000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-133101000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	2514000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-205833000	USD
CY2019	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	39000000	USD
CY2018	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	358000000	USD
CY2017	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	97000000	USD
CY2019	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	39000000	USD
CY2018	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	443000000	USD
CY2017	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	12000000	USD
CY2019	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	20980000	USD
CY2018	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	8150000	USD
CY2017	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	4200000	USD
CY2019	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	426217000	USD
CY2017	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	498750000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	40000000	USD
CY2018	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	1217000	USD
CY2017	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	641100000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	7374000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	20110000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	12168000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	24419000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	411775000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	13938000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	5955000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	4375000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-155000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-161000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-65000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-78180000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-65931000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-67760000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1660000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1342000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2622000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-3247000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	80944000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-154561000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	126662000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	45718000	USD
CY2016Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	200279000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	123415000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	126662000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	45718000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	49879000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	39898000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	26131000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	38698000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	41601000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	49813000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	3719000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	916000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	1330000	USD
CY2016Q3	us-gaap	Stockholders Equity StockholdersEquity	257246000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	84639000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7968000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	12788000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	12168000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	13938000	USD
CY2017Q3	us-gaap	Stockholders Equity StockholdersEquity	360871000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	136645000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1544000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	14664000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	20110000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	411775000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	122059000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	139051000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-22927000	USD
CY2019	us-gaap	Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Tax Effect TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	0	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11798000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	7374000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	24419000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	232936000	USD
CY2010Q4	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.12
CY2014Q2	atkr	Paymentsfor Repurchaseof Common Stock Excluding Related Expense PaymentsforRepurchaseofCommonStockExcludingRelatedExpense	250000000	USD
CY2017	atkr	Saleof Stock Numberof Shares Soldby Parent SaleofStockNumberofSharesSoldbyParent	19550000	shares
CY2017Q3	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	75000000.0	USD
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.042
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Use of Estimates </span><span style="font-family:inherit;font-size:10pt;">— 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. </span></div>
CY2019Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	315353000	USD
CY2019Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	44983000	USD
CY2018	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	558000	USD
CY2017	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	1676000	USD
CY2019	atkr	Business Acquisition Goodwill Expected Tax Deductible Amount Amortization Period BusinessAcquisitionGoodwillExpectedTaxDeductibleAmountAmortizationPeriod	P15Y
CY2018	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	24527000	USD
CY2018	us-gaap	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Intangibles BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles	18793000	USD
CY2018	us-gaap	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Property Plant And Equipment BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment	2536000	USD
CY2018	atkr	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Deferred Tax Liabilities BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredTaxLiabilities	8270000	USD
CY2018	atkr	Business Acquisition Goodwill Expected Tax Deductible Amount Amortization Period BusinessAcquisitionGoodwillExpectedTaxDeductibleAmountAmortizationPeriod	P15Y
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.070
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.037
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.035
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.063
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.064
CY2019Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	137959000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	105414000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Plan Assets DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets	103451000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Plan Assets DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets	88339000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	137959000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	105414000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	103451000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	88339000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	5841000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	6442000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	6159000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	6670000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	6903000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	37071000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3572000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3600000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3000000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11798000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	14664000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	12788000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2949000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3681000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4731000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	7374000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	20110000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	12168000	USD
CY2019Q3	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	17.90
CY2018Q3	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	20.01
CY2017Q3	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	21.45
CY2016Q3	us-gaap	Restructuring Reserve RestructuringReserve	1380000	USD
CY2017	us-gaap	Restructuring Charges RestructuringCharges	1522000	USD
CY2017	us-gaap	Payments For Restructuring PaymentsForRestructuring	1919000	USD
CY2017	us-gaap	Restructuring Reserve Translation And Other Adjustment RestructuringReserveTranslationAndOtherAdjustment	-266000	USD
CY2017	us-gaap	Restructuring Reserve Translation Adjustment RestructuringReserveTranslationAdjustment	-20000	USD
CY2017Q3	us-gaap	Restructuring Reserve RestructuringReserve	737000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	2040000	USD
CY2018	us-gaap	Payments For Restructuring PaymentsForRestructuring	2043000	USD
CY2018	us-gaap	Restructuring Reserve Translation And Other Adjustment RestructuringReserveTranslationAndOtherAdjustment	-191000	USD
CY2018	us-gaap	Restructuring Reserve Translation Adjustment RestructuringReserveTranslationAdjustment	-8000	USD
CY2018Q3	us-gaap	Restructuring Reserve RestructuringReserve	551000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	3804000	USD
CY2019	us-gaap	Payments For Restructuring PaymentsForRestructuring	3818000	USD
CY2019Q3	us-gaap	Restructuring Reserve RestructuringReserve	537000	USD
CY2019	atkr	Restructuring Charges Net RestructuringChargesNet	3804000	USD
CY2018	atkr	Restructuring Charges Net RestructuringChargesNet	1849000	USD
CY2017	atkr	Restructuring Charges Net RestructuringChargesNet	1256000	USD
CY2019	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	7384000	USD
CY2018	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	0	USD
CY2017	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	USD
CY2018	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	27575000	USD
CY2017	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	USD
CY2019	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
CY2018	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
CY2017	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	5774000	USD
CY2019	atkr	Undesignated Foreign Currency Derivative Instruments UndesignatedForeignCurrencyDerivativeInstruments	-5384000	USD
CY2018	atkr	Undesignated Foreign Currency Derivative Instruments UndesignatedForeignCurrencyDerivativeInstruments	-121000	USD
CY2017	atkr	Undesignated Foreign Currency Derivative Instruments UndesignatedForeignCurrencyDerivativeInstruments	2741000	USD
CY2019	atkr	Foreign Exchange Gain Losson Intercompany Loans ForeignExchangeGainLossonIntercompanyLoans	-2975000	USD
CY2018	atkr	Foreign Exchange Gain Losson Intercompany Loans ForeignExchangeGainLossonIntercompanyLoans	-1500000	USD
CY2017	atkr	Foreign Exchange Gain Losson Intercompany Loans ForeignExchangeGainLossonIntercompanyLoans	2038000	USD
CY2019	us-gaap	Gains Losses On Restructuring Of Debt GainsLossesOnRestructuringOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Restructuring Of Debt GainsLossesOnRestructuringOfDebt	-892000	USD
CY2017	us-gaap	Gains Losses On Restructuring Of Debt GainsLossesOnRestructuringOfDebt	0	USD
CY2019	us-gaap	Pension Contributions PensionContributions	1606000	USD
CY2018	us-gaap	Pension Contributions PensionContributions	1975000	USD
CY2017	us-gaap	Pension Contributions PensionContributions	1504000	USD
CY2019	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	79000	USD
CY2018	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	69000	USD
CY2017	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	0	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	11478000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	27348000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6575000	USD
CY2017Q4	atkr	Effective Income Tax Rate Reconciliation Effectof Tax Cutsand Jobs Actof2017 Amount EffectiveIncomeTaxRateReconciliationEffectofTaxCutsandJobsActof2017Amount	4758000	USD
CY2018	atkr	Effective Income Tax Rate Reconciliation Effectof Tax Cutsand Jobs Actof2017 Amount EffectiveIncomeTaxRateReconciliationEffectofTaxCutsandJobsActof2017Amount	708000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	170780000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	155453000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	116580000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	13889000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	10899000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	9545000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	184669000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	166352000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	126125000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	31431000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	26586000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	33127000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	9800000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	8662000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4246000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	5183000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	3467000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	3175000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	46414000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	38715000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	40548000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1123000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-7149000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	224000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-340000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1793000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	469000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1579000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-66000	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	245000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-796000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-9008000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	938000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	45618000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29707000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	41486000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.25
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.04
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.03
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.03
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Deductions EffectiveIncomeTaxRateReconciliationDeductions	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Deductions EffectiveIncomeTaxRateReconciliationDeductions	0.03
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Deductions EffectiveIncomeTaxRateReconciliationDeductions	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.02
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.02
CY2019	atkr	Effective Income Tax Rate Reconciliation Indemnified Uncertain Tax Benefits Percent EffectiveIncomeTaxRateReconciliationIndemnifiedUncertainTaxBenefitsPercent	0
CY2018	atkr	Effective Income Tax Rate Reconciliation Indemnified Uncertain Tax Benefits Percent EffectiveIncomeTaxRateReconciliationIndemnifiedUncertainTaxBenefitsPercent	0.02
CY2017	atkr	Effective Income Tax Rate Reconciliation Indemnified Uncertain Tax Benefits Percent EffectiveIncomeTaxRateReconciliationIndemnifiedUncertainTaxBenefitsPercent	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.01
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.03
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.03
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.01
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.25
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.18
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.33
CY2019	atkr	Effective Income Tax Rate Reconciliation Indemnified Uncertain Tax Benefits Amount EffectiveIncomeTaxRateReconciliationIndemnifiedUncertainTaxBenefitsAmount	7566000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	953000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Transition Tax On Accumulated Foreign Earnings Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017TransitionTaxOnAccumulatedForeignEarningsAmount	635000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	794000	USD
CY2019	atkr	Effective Income Tax Rate Reconciliation Acquisition Of Business Amount EffectiveIncomeTaxRateReconciliationAcquisitionOfBusinessAmount	1551000	USD
CY2019	atkr	Effective Income Tax Reconciliation Excess Tax Benefit Stock Option EffectiveIncomeTaxReconciliationExcessTaxBenefitStockOption	1537000	USD
CY2018	atkr	Effective Income Tax Rate Reconciliation Indemnified Uncertain Tax Benefits Amount EffectiveIncomeTaxRateReconciliationIndemnifiedUncertainTaxBenefitsAmount	5466000	USD
CY2018	atkr	Effective Income Tax Reconciliation Excess Tax Benefit Stock Option EffectiveIncomeTaxReconciliationExcessTaxBenefitStockOption	4091000	USD
CY2018	atkr	Effective Income Tax Rate Reconciliation Releaseof Indemnified Tax Positions EffectiveIncomeTaxRateReconciliationReleaseofIndemnifiedTaxPositions	3977000	USD
CY2018	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	3309000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5675000	USD
CY2017	atkr	Effective Income Tax Rate Reconciliation Indemnified Uncertain Tax Benefits Amount EffectiveIncomeTaxRateReconciliationIndemnifiedUncertainTaxBenefitsAmount	3589000	USD
CY2017	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	2761000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3459000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	32664000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	32099000	USD
CY2019Q3	atkr	Deferred Tax Assets Operating Lossand Tax Credit Carryforwards DeferredTaxAssetsOperatingLossandTaxCreditCarryforwards	13296000	USD
CY2018Q3	atkr	Deferred Tax Assets Operating Lossand Tax Credit Carryforwards DeferredTaxAssetsOperatingLossandTaxCreditCarryforwards	12435000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	10315000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	4317000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	8813000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	11220000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	916000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	218000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	66004000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	60289000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	21312000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	13739000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	47887000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	48375000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	4790000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	5321000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3660000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1775000	USD
CY2019Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	77649000	USD
CY2018Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	69210000	USD
CY2019Q3	atkr	Deferred Tax Assets Netof Deferred Tax Liabilities Before Valuation Allowance DeferredTaxAssetsNetofDeferredTaxLiabilitiesBeforeValuationAllowance	11645000	USD
CY2018Q3	atkr	Deferred Tax Assets Netof Deferred Tax Liabilities Before Valuation Allowance DeferredTaxAssetsNetofDeferredTaxLiabilitiesBeforeValuationAllowance	8921000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7764000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7427000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	19409000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	16348000	USD
CY2019	atkr	Operating Loss Carryforwards Expiration Term OperatingLossCarryforwardsExpirationTerm	P5Y
CY2019Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	54000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	244000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	78000	USD
CY2016Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3803000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	63000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	288000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3578000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	893000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	3107000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1364000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	814000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	794000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Transition Tax On Accumulated Foreign Earnings Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017TransitionTaxOnAccumulatedForeignEarningsAmount	635000	USD
CY2019Q3	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	52404000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	139051000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	136645000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	84639000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	3726000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	2456000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	241000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	135325000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	134189000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	84398000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46577000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	51791000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63420000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1200000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2298000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	3134000	shares
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.48
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47777000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54089000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	66554000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.91
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.59
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.33
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.83
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	1215000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-329000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-23003000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-76000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-888000	USD
CY2019Q3	us-gaap	Percentage Of Lifo Inventory PercentageOfLIFOInventory	0.72
CY2018Q3	us-gaap	Percentage Of Lifo Inventory PercentageOfLIFOInventory	0.80
CY2019Q3	atkr	Inventory Raw Materialsand Purchased Parts Netof Valuation Reserves InventoryRawMaterialsandPurchasedPartsNetofValuationReserves	52742000	USD
CY2018Q3	atkr	Inventory Raw Materialsand Purchased Parts Netof Valuation Reserves InventoryRawMaterialsandPurchasedPartsNetofValuationReserves	58572000	USD
CY2019Q3	atkr	Inventory Workin Process Netof Valuation Reserves InventoryWorkinProcessNetofValuationReserves	21424000	USD
CY2018Q3	atkr	Inventory Workin Process Netof Valuation Reserves InventoryWorkinProcessNetofValuationReserves	21769000	USD
CY2019Q3	atkr	Inventory Finished Goods Netof Valuation Reserves InventoryFinishedGoodsNetofValuationReserves	151924000	USD
CY2018Q3	atkr	Inventory Finished Goods Netof Valuation Reserves InventoryFinishedGoodsNetofValuationReserves	141412000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	226090000	USD
CY2018Q3	us-gaap	Inventory Net InventoryNet	221753000	USD
CY2019Q3	us-gaap	Inventory Lifo Reserve InventoryLIFOReserve	3138000	USD
CY2018Q3	us-gaap	Inventory Lifo Reserve InventoryLIFOReserve	26340000	USD
CY2019Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	14295000	USD
CY2018Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	12909000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	520533000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	438792000	USD
CY2019Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	259830000	USD
CY2018Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	225684000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	260703000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	213108000	USD
CY2019	us-gaap	Depreciation Depreciation	39471000	USD
CY2018	us-gaap	Depreciation Depreciation	34786000	USD
CY2017	us-gaap	Depreciation Depreciation	32320000	USD
CY2017Q3	us-gaap	Goodwill Goodwill	147716000	USD
CY2018	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	2626000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	813000	USD
CY2018	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	24527000	USD
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-301000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	170129000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	18124000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	372342000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	179538000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	192804000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	346298000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	147262000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	199036000	USD
CY2019Q3	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	465222000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	179538000	USD
CY2019Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	285684000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-2022000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	186231000	USD
CY2018Q3	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	439178000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	147262000	USD
CY2018Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	291916000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	32876000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	32104000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	22407000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	32400000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	32320000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	30893000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	30575000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	26101000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	40515000	USD
CY2019Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	6569000	USD
CY2018Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	8194000	USD
CY2019Q3	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	845317000	USD
CY2018Q3	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	904247000	USD
CY2019Q3	us-gaap	Debt Current DebtCurrent	0	USD
CY2018Q3	us-gaap	Debt Current DebtCurrent	26561000	USD
CY2019Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	845317000	USD
CY2018Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	877686000	USD
CY2019Q3	us-gaap	Contractual Obligation Due In Next Twelve Months ContractualObligationDueInNextTwelveMonths	0	USD
CY2019Q3	us-gaap	Contractual Obligation Due In Second Year ContractualObligationDueInSecondYear	0	USD
CY2019Q3	us-gaap	Contractual Obligation Due In Third Year ContractualObligationDueInThirdYear	0	USD
CY2019Q3	us-gaap	Contractual Obligation Due In Fourth Year ContractualObligationDueInFourthYear	0	USD
CY2019Q3	us-gaap	Contractual Obligation Due In Fifth Year ContractualObligationDueInFifthYear	852120000	USD
CY2019Q3	us-gaap	Contractual Obligation Due After Fifth Year ContractualObligationDueAfterFifthYear	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-9805000	USD
CY2018	us-gaap	Gains Losses On Restructuring Of Debt GainsLossesOnRestructuringOfDebt	-892000	USD
CY2019Q3	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	97011000	USD
CY2019Q3	us-gaap	Purchase Obligation Due In Second Year PurchaseObligationDueInSecondYear	1826000	USD
CY2019Q3	us-gaap	Purchase Obligation Due In Third Year PurchaseObligationDueInThirdYear	411000	USD
CY2019	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	17077000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	17403000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	12941000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	13526000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	11592000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	8666000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	6362000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	5097000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	6938000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	52181000	USD
CY2019Q3	atkr	Total Settlementfor Prior Cap Agreement Deductible TotalSettlementforPriorCapAgreementDeductible	13000000	USD
CY2018	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	6000000	USD
CY2017	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	8300000	USD
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1916538000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1835139000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1503934000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	34860000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	38501000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	25122000	USD
CY2019Q3	us-gaap	Assets Assets	1436995000	USD
CY2018Q3	us-gaap	Assets Assets	1324060000	USD
CY2017Q3	us-gaap	Assets Assets	1215092000	USD
CY2019	atkr	Selling Generaland Administrative Expense Unallocated SellingGeneralandAdministrativeExpenseUnallocated	38217000	USD
CY2018	atkr	Selling Generaland Administrative Expense Unallocated SellingGeneralandAdministrativeExpenseUnallocated	35050000	USD
CY2017	atkr	Selling Generaland Administrative Expense Unallocated SellingGeneralandAdministrativeExpenseUnallocated	25430000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	72347000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	66890000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	54727000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-50473000	USD
CY2018	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-40694000	USD
CY2017	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-26598000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-9805000	USD
CY2019	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	3804000	USD
CY2018	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	1849000	USD
CY2017	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	1256000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11798000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	14664000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	12788000	USD
CY2019	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	0	USD
CY2018	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	4833000	USD
CY2017	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	-7551000	USD
CY2019	atkr	Transaction Costs TransactionCosts	1200000	USD
CY2018	atkr	Transaction Costs TransactionCosts	9314000	USD
CY2017	atkr	Transaction Costs TransactionCosts	4779000	USD
CY2019	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	7384000	USD
CY2018	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	0	USD
CY2017	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	0	USD
CY2018	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	27575000	USD
CY2017	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	USD
CY2019	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
CY2018	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
CY2017	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	5774000	USD
CY2019	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-7501000	USD
CY2018	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-4194000	USD
CY2017	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	10247000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	184669000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	166352000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	126125000	USD
CY2019Q3	us-gaap	Noncurrent Assets NoncurrentAssets	264966000	USD
CY2018Q3	us-gaap	Noncurrent Assets NoncurrentAssets	214715000	USD
CY2017Q3	us-gaap	Noncurrent Assets NoncurrentAssets	215671000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1916538000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1835139000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1503934000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1916538000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1835139000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1503934000	USD
CY2019Q3	atkr	Customer Percentage Of Sales Or Accounts Receivable CustomerPercentageOfSalesOrAccountsReceivable	0.10
CY2019Q3	us-gaap	Multiemployer Plans Collective Bargaining Arrangement Percentage Of Employers Participants MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersParticipants	0.27
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	452028000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	469309000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	493491000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	501710000	USD
CY2017Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	414558000	USD
CY2018Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	445000000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	498014000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	477567000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	110256000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	117088000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	126134000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	143722000	USD
CY2017Q4	us-gaap	Gross Profit GrossProfit	96867000	USD
CY2018Q1	us-gaap	Gross Profit GrossProfit	109157000	USD
CY2018Q2	us-gaap	Gross Profit GrossProfit	120329000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	111731000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	26949000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	29555000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	36550000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	45997000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	27189000	USD
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	42558000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	34199000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	32699000	USD
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.77
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.96
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.83
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.69
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.54
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.61
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.75
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.94
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.79
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2019Q3	us-gaap	Common Stock Value CommonStockValue	471000	USD
CY2018Q3	us-gaap	Common Stock Value CommonStockValue	472000	USD
CY2019Q3	us-gaap	Treasury Stock Value TreasuryStockValue	2580000	USD
CY2018Q3	us-gaap	Treasury Stock Value TreasuryStockValue	2580000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-200396000	USD
CY2018Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-317373000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-41698000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-16438000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1544000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7968000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	7374000	USD
CY2014Q2	atkr	Paymentsfor Repurchaseof Common Stock Excluding Related Expense PaymentsforRepurchaseofCommonStockExcludingRelatedExpense	250000000	USD

Files In Submission

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$ATKR
Atkore Inc. Stock $atkr

2018 Q3 Form 10-K Financial Statement

#000166613819000094 Filed on November 22, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ATKR Atkore Inc. Stock $atkr

2018 Q3 Form 10-K Financial Statement

#000166613819000094 Filed on November 22, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ATKR
Atkore Inc. Stock $atkr