$EAF
GRAFTECH INTERNATIONAL LTD Stock $eaf

$eaf Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000093114824000021 Filed on February 14, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$136.6M	$137.1M	$620.5M
YoY Change	-1.6%	-44.59%	-51.57%
Cost Of Revenue	$137.9M	$156.8M	$584.3M
YoY Change	22.42%	-4.08%	-19.56%
Gross Profit	-$1.312M	-$19.68M	$36.21M
YoY Change	-105.02%	-123.42%	-93.47%
Gross Profit Margin	-0.96%	-14.35%	5.84%
Selling, General & Admin	$15.28M	$15.08M	$74.01M
YoY Change	-31.03%	-21.11%	-3.85%
% of Gross Profit			204.39%
Research & Development	$1.627M	$1.837M	$5.520M
YoY Change	36.49%	79.39%	51.61%
% of Gross Profit			15.24%
Depreciation & Amortization	$13.88M	$13.79M	$47.70M
YoY Change	28.82%	0.01%	5.07%
% of Gross Profit			131.72%
Operating Expenses	$16.90M	$16.92M	$79.53M
YoY Change	-27.58%	-16.0%	-1.35%
Operating Profit	-$21.36M	-$36.60M	-$214.4M
YoY Change	-859.1%	-157.28%	-145.22%
Interest Expense	$15.63M	-$13.97M	$58.09M
YoY Change	22.02%	51.07%	58.85%
% of Operating Profit
Other Income/Expense, Net	$393.0K	-$3.418M	-$4.679M
YoY Change	-160.18%	-138.89%	-146.49%
Pretax Income	-$35.07M	-$225.1M	-$273.8M
YoY Change	241.38%	-454.9%	-160.52%
Income Tax	-$4.201M	-$7.695M	-$18.51M
% Of Pretax Income
Net Earnings	-$30.87M	-$217.4M	-$255.3M
YoY Change	318.9%	-531.96%	-166.65%
Net Earnings / Revenue	-22.6%	-158.52%	-41.14%
Basic Earnings Per Share	-$0.12		-$0.99
Diluted Earnings Per Share	-$0.12	-$0.85	-$0.99
COMMON SHARES
Basic Shares Outstanding	256.8M shares	256.8M shares	257.0M shares
Diluted Shares Outstanding	257.4M shares		257.0M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$165.2M	$176.9M	$176.9M
YoY Change	21.97%	31.37%	31.37%
Cash & Equivalents	$165.2M	$176.9M	$176.9M
Short-Term Investments
Other Short-Term Assets	$60.38M	$11.34M	$66.38M
YoY Change	-16.93%	-42.18%	90.4%
Inventory	$302.9M	$330.1M	$330.1M
Prepaid Expenses
Receivables	$91.59M	$101.4M	$101.4M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$620.0M	$674.8M	$674.8M
YoY Change	-18.49%	-17.23%	-17.23%
LONG-TERM ASSETS
Property, Plant & Equipment	$507.2M	$522.1M	$522.1M
YoY Change	-3.78%	0.57%	-0.53%
Goodwill		$0.00
YoY Change		-100.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$57.36M	$60.44M	$91.98M
YoY Change	-26.85%	-30.31%	122.18%
Total Long-Term Assets	$595.8M	$614.1M	$614.1M
YoY Change	-25.01%	-22.16%	-22.16%
TOTAL ASSETS
Total Short-Term Assets	$620.0M	$674.8M	$674.8M
Total Long-Term Assets	$595.8M	$614.1M	$614.1M
Total Assets	$1.216B	$1.289B	$1.289B
YoY Change	-21.82%	-19.65%	-19.65%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$60.33M	$83.27M	$83.27M
YoY Change	-30.37%	-19.28%	-19.28%
Accrued Expenses	$104.0M	$101.7M	$101.7M
YoY Change	-2.1%	-21.72%	-0.33%
Deferred Revenue		$31.58M
YoY Change		13.29%
Short-Term Debt	$0.00	$134.0K	$0.00
YoY Change		8.06%
Long-Term Debt Due	$132.0K	$134.0K	$134.0K
YoY Change	3.13%	8.06%	8.06%
Total Short-Term Liabilities	$166.4M	$190.5M	$190.5M
YoY Change	-16.01%	-19.89%	-19.89%
LONG-TERM LIABILITIES
Long-Term Debt	$926.8M	$925.5M	$925.5M
YoY Change	0.46%	0.4%	0.4%
Other Long-Term Liabilities	$54.15M	$55.65M	$61.38M
YoY Change	4.92%	9.49%	-0.58%
Total Long-Term Liabilities	$980.9M	$981.2M	$986.9M
YoY Change	0.7%	0.88%	0.34%
TOTAL LIABILITIES
Total Short-Term Liabilities	$166.4M	$190.5M	$190.5M
Total Long-Term Liabilities	$980.9M	$981.2M	$986.9M
Total Liabilities	$1.147B	$1.172B	$1.211B
YoY Change	-2.13%	-3.2%	-4.41%
SHAREHOLDERS EQUITY
Retained Earnings	-$693.2M	-$662.4M
YoY Change	68.27%	64.8%
Common Stock	$2.572M	$2.568M
YoY Change	0.19%	0.08%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$37.62M	$78.25M	$78.25M
YoY Change
Total Liabilities & Shareholders Equity	$1.216B	$1.289B	$1.289B
YoY Change	-21.82%	-19.65%	-19.65%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	-$30.87M	-$217.4M	-$255.3M
YoY Change	318.9%	-531.96%	-166.65%
Depreciation, Depletion And Amortization	$13.88M	$13.79M	$47.70M
YoY Change	28.82%	0.01%	5.07%
Cash From Operating Activities	-$530.0K	$9.261M	$76.56M
YoY Change	-102.14%	-81.49%	-76.42%
INVESTING ACTIVITIES
Capital Expenditures	$10.51M	$5.740M	$54.04M
YoY Change	-58.41%	-78.65%	-25.12%
Acquisitions
YoY Change
Other Investing Activities	$3.000K	$20.00K	$220.0K
YoY Change	-96.74%	-41.18%	12.82%
Cash From Investing Activities	-$10.51M	-$5.720M	-$53.82M
YoY Change	-58.27%	-78.7%	-25.22%
FINANCING ACTIVITIES
Cash Dividend Paid	$0.00		$3.854M
YoY Change	-100.0%		-50.4%
Common Stock Issuance & Retirement, Net			$0.00
YoY Change			-100.0%
Debt Paid & Issued, Net			$433.8M
YoY Change			293.96%
Cash From Financing Activities	-$98.00K	-187.0K	$18.71M
YoY Change	-112.14%	523.33%	-110.62%
NET CHANGE
Cash From Operating Activities	-$530.0K	9.261M	$76.56M
Cash From Investing Activities	-$10.51M	-5.720M	-$53.82M
Cash From Financing Activities	-$98.00K	-187.0K	$18.71M
Net Change In Cash	-$11.14M	3.354M	$41.45M
YoY Change	-2714.08%	-85.51%	-45.73%
FREE CASH FLOW
Cash From Operating Activities	-$530.0K	$9.261M	$76.56M
Capital Expenditures	$10.51M	$5.740M	$54.04M
Free Cash Flow	-$11.04M	$3.521M	$22.52M
YoY Change	2234.25%	-84.78%	-91.08%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.99
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	257042843	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	258791228	shares
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-255250000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	382962000	usd
	us-gaap	Net Income Loss NetIncomeLoss	388330000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-8000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	usd
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	usd
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0000931148
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	us-gaap	Environmental Remediation Expense Statement Of Income Or Comprehensive Income Extensible Enumeration EnvironmentalRemediationExpenseStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#SellingGeneralAndAdministrativeExpense
CY2023	us-gaap	Derivative Loss Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#InterestExpense
CY2022	us-gaap	Derivative Gain Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeGainStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#InterestExpense
CY2023Q4	us-gaap	Supplier Finance Program Obligation Statement Of Financial Position Extensible Enumeration SupplierFinanceProgramObligationStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2023#AccountsPayableCurrent
CY2022Q4	us-gaap	Supplier Finance Program Obligation Statement Of Financial Position Extensible Enumeration SupplierFinanceProgramObligationStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2023#AccountsPayableCurrent
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAssetsNoncurrent
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAssetsNoncurrent
CY2022Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAccruedLiabilitiesCurrent
CY2023Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAccruedLiabilitiesCurrent
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilitiesNoncurrent
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilitiesNoncurrent
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#PropertyPlantAndEquipmentGross
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#PropertyPlantAndEquipmentGross
CY2023Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAccruedLiabilitiesCurrent
CY2022Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAccruedLiabilitiesCurrent
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilitiesNoncurrent
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilitiesNoncurrent
CY2023	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost Credit Excluding Service Cost Statement Of Income Or Comprehensive Income Extensible List DefinedBenefitPlanNetPeriodicBenefitCostCreditExcludingServiceCostStatementOfIncomeOrComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#NonoperatingIncomeExpense
CY2022	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList	http://fasb.org/us-gaap/2023#NonoperatingIncomeExpense
CY2023	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList	http://fasb.org/us-gaap/2023#NonoperatingIncomeExpense
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	1-13888
CY2023Q4	us-gaap	Assets Assets	1288889000	usd
CY2023	dei	Entity Registrant Name EntityRegistrantName	GRAFTECH INTERNATIONAL LTD.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-2496053
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	982 Keynote Circle
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	44131
CY2023	dei	City Area Code CityAreaCode	216
CY2023	dei	Local Phone Number LocalPhoneNumber	676-2000
CY2023	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value per share
CY2023	dei	Trading Symbol TradingSymbol	EAF
CY2023	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	970600000	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	256831870	shares
CY2023	dei	Auditor Firm AuditorFirmId	34
CY2023	dei	Auditor Name AuditorName	DELOITTE & TOUCHE LLP
CY2023	dei	Auditor Location AuditorLocation	Cleveland, Ohio
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	176878000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	134641000	usd
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	7708000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	8019000	usd
CY2023Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	101387000	usd
CY2022Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	145574000	usd
CY2023Q4	us-gaap	Inventory Net InventoryNet	330146000	usd
CY2022Q4	us-gaap	Inventory Net InventoryNet	447741000	usd
CY2023Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	66382000	usd
CY2022Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	87272000	usd
CY2023Q4	us-gaap	Assets Current AssetsCurrent	674793000	usd
CY2022Q4	us-gaap	Assets Current AssetsCurrent	815228000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	920444000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	869168000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	398330000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	350022000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	522114000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	519146000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	31542000	usd
CY2022Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	11960000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	0	usd
CY2022Q4	us-gaap	Goodwill Goodwill	171117000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	60440000	usd
CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	86727000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1345788000	usd
CY2023	gti	Cost Of Goods And Services Sold Excluding Inventory Write Down CostOfGoodsAndServicesSoldExcludingInventoryWriteDown	571857000	usd
CY2022	gti	Cost Of Goods And Services Sold Excluding Inventory Write Down CostOfGoodsAndServicesSoldExcludingInventoryWriteDown	726373000	usd
CY2022Q4	us-gaap	Assets Assets	1604178000	usd
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	83268000	usd
CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	103156000	usd
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	134000	usd
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	124000	usd
CY2023Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	10022000	usd
CY2022Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	40592000	usd
CY2023Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	91702000	usd
CY2022Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	89349000	usd
CY2023Q4	gti	Related Party Payable Tax Receivable Agreement Current RelatedPartyPayableTaxReceivableAgreementCurrent	5417000	usd
CY2022Q4	gti	Related Party Payable Tax Receivable Agreement Current RelatedPartyPayableTaxReceivableAgreementCurrent	4631000	usd
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	190543000	usd
CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	237852000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	925511000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	921803000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	55645000	usd
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	50822000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	33206000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	45065000	usd
CY2023Q4	gti	Related Party Payable Tax Receivable Agreement Noncurrent RelatedPartyPayableTaxReceivableAgreementNoncurrent	5737000	usd
CY2022Q4	gti	Related Party Payable Tax Receivable Agreement Noncurrent RelatedPartyPayableTaxReceivableAgreementNoncurrent	10921000	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	300000000	shares
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	300000000	shares
CY2023Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2022Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2023Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2022Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	3000000000	shares
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	3000000000	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	256831870	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	256831870	shares
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	256597342	shares
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	256597342	shares
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	2568000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	2566000	usd
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	749527000	usd
CY2022Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	745164000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-11458000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-8070000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-662390000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-401945000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	78247000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	337715000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1288889000	usd
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1604178000	usd
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	620500000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1281250000	usd
CY2021	gti	Cost Of Goods And Services Sold Excluding Inventory Write Down CostOfGoodsAndServicesSoldExcludingInventoryWriteDown	701335000	usd
CY2023	us-gaap	Inventory Write Down InventoryWriteDown	12431000	usd
CY2022	us-gaap	Inventory Write Down InventoryWriteDown	0	usd
CY2021	us-gaap	Inventory Write Down InventoryWriteDown	0	usd
CY2023	us-gaap	Gross Profit GrossProfit	36212000	usd
CY2022	us-gaap	Gross Profit GrossProfit	554877000	usd
CY2021	us-gaap	Gross Profit GrossProfit	644453000	usd
CY2023	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	5520000	usd
CY2022	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	3641000	usd
CY2021	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	3771000	usd
CY2023	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	74012000	usd
CY2022	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	76977000	usd
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	132608000	usd
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	171117000	usd
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	-214437000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	474259000	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	508074000	usd
CY2023	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-4679000	usd
CY2022	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	10147000	usd
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	16220000	usd
CY2023	us-gaap	Interest Expense InterestExpense	58087000	usd
CY2022	us-gaap	Interest Expense InterestExpense	36568000	usd
CY2021	us-gaap	Interest Expense InterestExpense	68760000	usd
CY2022	us-gaap	Interest Income Other InterestIncomeOther	4480000	usd
CY2021	us-gaap	Interest Income Other InterestIncomeOther	872000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	456406000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.99
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	257042843	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	258781843	shares
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.48
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.46
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	266317194	shares
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	10166000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-7024000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-19605000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	-4424000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	2591000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	8632000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-13554000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	6398000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	31802000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3388000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-626000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	12197000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-258638000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	382336000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	400527000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-255250000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	382962000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	388330000	usd
CY2023	us-gaap	Depreciation And Amortization DepreciationAndAmortization	56889000	usd
CY2022	us-gaap	Depreciation And Amortization DepreciationAndAmortization	55496000	usd
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	65716000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-28123000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	17022000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3657000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	4433000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	2311000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	16631000	usd
CY2023	gti	Interest Income Expense Noncash InterestIncomeExpenseNoncash	-8786000	usd
CY2022	gti	Interest Income Expense Noncash InterestIncomeExpenseNoncash	2428000	usd
CY2021	gti	Interest Income Expense Noncash InterestIncomeExpenseNoncash	-12051000	usd
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	171117000	usd
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023	us-gaap	Inventory Write Down InventoryWriteDown	12431000	usd
CY2022	us-gaap	Inventory Write Down InventoryWriteDown	0	usd
CY2021	us-gaap	Inventory Write Down InventoryWriteDown	0	usd
CY2023	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-5077000	usd
CY2022	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	8023000	usd
CY2021	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-7107000	usd
CY2023	gti	Repayments Of Related Party Payable RepaymentsOfRelatedPartyPayable	4398000	usd
CY2021	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	5193000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	324628000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	443040000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	54040000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	72165000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	58257000	usd
CY2023	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	220000	usd
CY2022	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	195000	usd
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	397000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-53820000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-71970000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-57860000	usd
CY2023	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	27453000	usd
CY2022	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	6423000	usd
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4170000	usd
CY2023	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	8152000	usd
CY2022	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2232000	usd
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	3109000	usd
CY2023	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	438552000	usd
CY2022	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	usd
CY2021	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	usd
CY2023	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	433841000	usd
CY2022	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	110124000	usd
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	400142000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	60000000	usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	50000000	usd
CY2023	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	129000	usd
CY2022	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	230000	usd
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4077000	usd
CY2023	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	usd
CY2022	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	225000	usd
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	351000	usd
CY2023	us-gaap	Payments Of Dividends PaymentsOfDividends	3854000	usd
CY2022	us-gaap	Payments Of Dividends PaymentsOfDividends	7770000	usd
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	7439000	usd
CY2023	gti	Payment Of Dividends Related Party PaymentOfDividendsRelatedParty	1280000	usd
CY2022	gti	Payment Of Dividends Related Party PaymentOfDividendsRelatedParty	2559000	usd
CY2021	gti	Payment Of Dividends Related Party PaymentOfDividendsRelatedParty	3206000	usd
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	36000	usd
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	usd
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	18713000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-176267000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-471792000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	41454000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	76391000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-86612000	usd
CY2023	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	783000	usd
CY2022	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	736000	usd
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1316000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	134641000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	57514000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	145442000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	176878000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	134641000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	57514000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	34322000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	39503000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	56333000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	43326000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	67122000	usd
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	63791000	usd
CY2023	gti	Capital Expenditures Incurred But Not Yet Paid Net CapitalExpendituresIncurredButNotYetPaidNet	-9431000	usd
CY2022	gti	Capital Expenditures Incurred But Not Yet Paid Net CapitalExpendituresIncurredButNotYetPaidNet	7748000	usd
CY2021	gti	Capital Expenditures Incurred But Not Yet Paid Net CapitalExpendituresIncurredButNotYetPaidNet	6755000	usd
CY2023	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	-45680000	usd
CY2022	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	-60507000	usd
CY2021	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	28927000	usd
CY2023	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-107796000	usd
CY2022	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	153579000	usd
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	28165000	usd
CY2023	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-3352000	usd
CY2022	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-593000	usd
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	31921000	usd
CY2023	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-27198000	usd
CY2022	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-15029000	usd
CY2021	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	5674000	usd
CY2023	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-23876000	usd
CY2022	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	7748000	usd
CY2021	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	66591000	usd
CY2023	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	1808000	usd
CY2022	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	185000	usd
CY2021	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	371000	usd
CY2023	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	-107562000	usd
CY2022	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	99575000	usd
CY2021	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	16377000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	-329385000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	388330000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-6662000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	24525000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-1970000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-7277000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	usd
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-19605000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	12197000	usd
CY2021	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	50000000	usd
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	16631000	usd
CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	351000	usd
CY2021	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4077000	usd
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.04
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	7439000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	23402000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	382962000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-5060000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	15829000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	2469000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	9431000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	usd
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-7024000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-626000	usd
CY2022	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	60000000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2311000	usd
CY2022	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	225000	usd
CY2022	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	230000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.04
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	7770000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	337715000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-255250000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-255250000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-474000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	1713000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	4898000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	15267000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-8000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	10166000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3388000	usd
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4433000	usd
CY2023	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	129000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.02
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	3854000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	78247000	usd
CY2023	us-gaap	Nature Of Operations NatureOfOperations	<div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Discussion of Business and Structure</span></div>
CY2018Q2	us-gaap	Shares Issued SharesIssued	38097525	shares
CY2018Q2	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	15.00
CY2023Q4	gti	Numberof Major Product Categories NumberofMajorProductCategories	2
CY2023	us-gaap	Inventory Write Down InventoryWriteDown	12400000	usd
CY2023	gti	Idle Inventory Costs IdleInventoryCosts	62400000	usd
CY2022	gti	Idle Inventory Costs IdleInventoryCosts	16000000	usd
CY2023	us-gaap	Depreciation Depreciation	47700000	usd
CY2022	us-gaap	Depreciation Depreciation	45400000	usd
CY2021	us-gaap	Depreciation Depreciation	55000000	usd
CY2023	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	14000000	usd
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	23400000	usd
CY2023Q4	gti	Related Party Tax Agreement Percent Of Savings RelatedPartyTaxAgreementPercentOfSavings	0.85
CY2023	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	12100000	usd
CY2022	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	22400000	usd
CY2021	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	16900000	usd
CY2022	us-gaap	Accrual For Environmental Loss Contingencies Charges To Expense For New Losses AccrualForEnvironmentalLossContingenciesChargesToExpenseForNewLosses	4400000	usd
CY2023	gti	Deferred Costs Amount Deferred In Period DeferredCostsAmountDeferredInPeriod	700000	usd
CY2022	gti	Deferred Costs Amount Deferred In Period DeferredCostsAmountDeferredInPeriod	17200000	usd
CY2023	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	7500000	usd
CY2022	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	4700000	usd
CY2021	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	4600000	usd
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:9pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Use of Estimates</span></div>The preparation of financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenue and expenses. Significant estimates and assumptions are used for, but are not limited to, inventory valuation, pension and other post-employment benefits, allowance for doubtful accounts, contingent liabilities, accruals and valuation allowances, asset impairment, and environmental-related accruals. Actual results could differ from our estimates
CY2023	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	.<div style="margin-top:9pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Reclassifications and Adjustments</span></div><div style="margin-top:9pt;text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain items previously reported in specific financial statement captions within the Consolidated Statements of Operations have been reclassified between lines to conform to the current presentation. In addition, specific financial statement captions within the Consolidated Statements of Cash Flows have been reclassified between lines within cash flow from operating activities to conform to the current presentation.</span></div>
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	620500000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1281250000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1345788000	usd
CY2022Q4	us-gaap	Contract With Customer Asset Gross Current ContractWithCustomerAssetGrossCurrent	0	usd
CY2023Q4	us-gaap	Contract With Customer Asset Gross Current ContractWithCustomerAssetGrossCurrent	0	usd
CY2023Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	31583000	usd
CY2022Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	27878000	usd
CY2023	us-gaap	Deferred Revenue Revenue Recognized1 DeferredRevenueRevenueRecognized1	13000000	usd
CY2022	us-gaap	Deferred Revenue Revenue Recognized1 DeferredRevenueRevenueRecognized1	2500000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	4400000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	2300000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	16600000	usd
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Accelerated Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost	14700000	usd
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Accelerated Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost	14700000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	200000	usd
CY2022	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	100000	usd
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1800000	usd
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1890167	shares
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	12.30
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	519482	shares
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	5.51
CY2023	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0	shares
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	0
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	382038	shares
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	8.56
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2027611	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	11.27
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0	usd
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P6Y6M
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	2027611	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	11.27
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	0	usd
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P6Y6M
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	1444617	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	12.84
CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	0	usd
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P5Y8M12D
CY2022Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	429503	shares
CY2022Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	5.42
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	519482	shares
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.01
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares	122221	shares
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue	5.73
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares	243770	shares
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue	3.42
CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	582994	shares
CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	4.04
CY2023	us-gaap	Restricted Stock Expense RestrictedStockExpense	1700000	usd
CY2022	us-gaap	Restricted Stock Expense RestrictedStockExpense	700000	usd
CY2021	us-gaap	Restricted Stock Expense RestrictedStockExpense	10000000	usd
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	900000	usd
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	100000	usd
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	10800000	usd
CY2023Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	4800000	usd
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	620500000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1281250000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1345788000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	522114000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	519146000	usd
CY2023Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	24494000	usd
CY2022Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	12049000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	925645000	usd
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	921927000	usd
CY2023Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	134000	usd
CY2022Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	124000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	925511000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	921803000	usd
CY2020Q4	gti	Debt Instrument Event Of Default Percentage Of Debt Held DebtInstrumentEventOfDefaultPercentageOfDebtHeld	0.30
CY2023Q4	gti	Debt Instrument Issue Price DebtInstrumentIssuePrice	0.97456	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	139000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	usd
CY2023	gti	Amortization Of Interest Rate Swap Deferred Gains Losses AmortizationOfInterestRateSwapDeferredGainsLosses	5480000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	950000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	0	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	950139000	usd
CY2015Q4	us-gaap	Goodwill Goodwill	171100000	usd
CY2015Q4	us-gaap	Goodwill Goodwill	171100000	usd
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	142300000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	99927000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	42373000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	142300000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	90753000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	51547000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9200000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10100000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10700000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	8000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	7300000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	6700000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	6100000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	5500000	usd
CY2023	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	56219000	usd
CY2022	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	43609000	usd
CY2021	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	56731000	usd
CY2023	us-gaap	Accretion Expense AccretionExpense	2524000	usd
CY2022	us-gaap	Accretion Expense AccretionExpense	1200000	usd
CY2021	us-gaap	Accretion Expense AccretionExpense	3387000	usd
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4631000	usd
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3475000	usd
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	8642000	usd
CY2022	gti	Amortization Of Interest Rate Swap Deferred Gains Losses AmortizationOfInterestRateSwapDeferredGainsLosses	0	usd
CY2021	gti	Amortization Of Interest Rate Swap Deferred Gains Losses AmortizationOfInterestRateSwapDeferredGainsLosses	0	usd
CY2023	us-gaap	Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments	-7111000	usd
CY2022	us-gaap	Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments	7111000	usd
CY2021	us-gaap	Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments	0	usd
CY2023	gti	Realized Gain On Interest Rate Swap Termination RealizedGainOnInterestRateSwapTermination	6918000	usd
CY2022	gti	Realized Gain On Interest Rate Swap Termination RealizedGainOnInterestRateSwapTermination	4605000	usd
CY2021	gti	Realized Gain On Interest Rate Swap Termination RealizedGainOnInterestRateSwapTermination	0	usd
CY2023	us-gaap	Interest Expense InterestExpense	58087000	usd
CY2022	us-gaap	Interest Expense InterestExpense	36568000	usd
CY2021	us-gaap	Interest Expense InterestExpense	68760000	usd
CY2023	gti	Realized Gain On Interest Rate Swap Termination RealizedGainOnInterestRateSwapTermination	6900000	usd
CY2023	us-gaap	Aoci Including Portion Attributable To Noncontrolling Interest Period Increase Decrease AociIncludingPortionAttributableToNoncontrollingInterestPeriodIncreaseDecrease	13500000	usd
CY2023Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	630000	usd
CY2023Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	519000	usd
CY2022Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	27476000	usd
CY2022Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	282000	usd
CY2023Q4	us-gaap	Debt Instrument Interest Rate Effective Percentage DebtInstrumentInterestRateEffectivePercentage	0.042
CY2022Q1	gti	Embedded Derivative Gain In Aoci EmbeddedDerivativeGainInAOCI	6600000	usd
CY2023	us-gaap	Derivative Loss On Derivative DerivativeLossOnDerivative	7100000	usd
CY2022	us-gaap	Derivative Gain On Derivative DerivativeGainOnDerivative	7100000	usd
CY2023Q2	us-gaap	Derivative Cash Received On Hedge DerivativeCashReceivedOnHedge	20400000	usd
CY2023Q2	us-gaap	Embedded Derivative Gain On Embedded Derivative EmbeddedDerivativeGainOnEmbeddedDerivative	23100000	usd
CY2023Q2	gti	Loss On Debt Host LossOnDebtHost	2800000	usd
CY2023Q4	gti	Loss On Debt Host In Aoci LossOnDebtHostInAOCI	1800000	usd
CY2023Q2	us-gaap	Embedded Derivative Gain On Embedded Derivative EmbeddedDerivativeGainOnEmbeddedDerivative	23100000	usd
CY2023Q2	gti	Realized Gain On Interest Rate Swap Termination RealizedGainOnInterestRateSwapTermination	6900000	usd
CY2023Q2	gti	Embedded Derivative Gain In Aoci EmbeddedDerivativeGainInAOCI	16200000	usd
CY2022Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	82813000	usd
CY2023Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	65660000	usd
CY2023Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	109084000	usd
CY2022Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	216761000	usd
CY2023Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	186473000	usd
CY2022Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	192821000	usd
CY2023Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	34589000	usd
CY2022Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	38159000	usd
CY2023Q4	us-gaap	Inventory Net InventoryNet	330146000	usd
CY2022Q4	us-gaap	Inventory Net InventoryNet	447741000	usd
CY2023Q4	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	11176000	usd
CY2022Q4	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	15261000	usd
CY2023Q4	us-gaap	Prepaid Taxes PrepaidTaxes	28629000	usd
CY2022Q4	us-gaap	Prepaid Taxes PrepaidTaxes	39417000	usd
CY2023Q4	us-gaap	Inventory Parts And Components Net Of Reserves InventoryPartsAndComponentsNetOfReserves	15242000	usd
CY2022Q4	us-gaap	Inventory Parts And Components Net Of Reserves InventoryPartsAndComponentsNetOfReserves	12990000	usd
CY2023Q4	us-gaap	Other Assets Current OtherAssetsCurrent	11335000	usd
CY2022Q4	us-gaap	Other Assets Current OtherAssetsCurrent	19604000	usd
CY2023Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	66382000	usd
CY2022Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	87272000	usd
CY2023Q4	us-gaap	Land Land	49962000	usd
CY2022Q4	us-gaap	Land Land	48478000	usd
CY2023Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	87820000	usd
CY2022Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	82054000	usd
CY2023Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	717002000	usd
CY2022Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	655823000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	920444000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	869168000	usd
CY2023Q4	us-gaap	Accrued Employee Benefits Current And Noncurrent AccruedEmployeeBenefitsCurrentAndNoncurrent	22369000	usd
CY2022Q4	us-gaap	Accrued Employee Benefits Current And Noncurrent AccruedEmployeeBenefitsCurrentAndNoncurrent	10799000	usd
CY2023Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	7018000	usd
CY2022Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	6921000	usd
CY2023Q4	us-gaap	Deferred Revenue DeferredRevenue	31583000	usd
CY2022Q4	us-gaap	Deferred Revenue DeferredRevenue	27878000	usd
CY2023Q4	us-gaap	Other Accrued Liabilities Current And Noncurrent OtherAccruedLiabilitiesCurrentAndNoncurrent	30732000	usd
CY2022Q4	us-gaap	Other Accrued Liabilities Current And Noncurrent OtherAccruedLiabilitiesCurrentAndNoncurrent	43751000	usd
CY2023Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	91702000	usd
CY2022Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	89349000	usd
CY2023Q4	us-gaap	Postemployment Benefits Liability Noncurrent PostemploymentBenefitsLiabilityNoncurrent	12613000	usd
CY2022Q4	us-gaap	Postemployment Benefits Liability Noncurrent PostemploymentBenefitsLiabilityNoncurrent	11996000	usd
CY2023Q4	gti	Pension And Related Benefits PensionAndRelatedBenefits	26068000	usd
CY2022Q4	gti	Pension And Related Benefits PensionAndRelatedBenefits	22768000	usd
CY2023Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	16964000	usd
CY2022Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	16058000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	55645000	usd
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	50822000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	8019000	usd
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	6835000	usd
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	8243000	usd
CY2023	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-439000	usd
CY2022	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1585000	usd
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-1266000	usd
CY2023	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	128000	usd
CY2022	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	-401000	usd
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	-142000	usd
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	7708000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	8019000	usd
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	6835000	usd
CY2022Q4	us-gaap	Supplier Finance Program Obligation SupplierFinanceProgramObligation	0	usd
CY2023	us-gaap	Supplier Finance Program Obligation Increase SupplierFinanceProgramObligationIncrease	24368000	usd
CY2023	us-gaap	Supplier Finance Program Obligation Decrease Settlement SupplierFinanceProgramObligationDecreaseSettlement	19732000	usd
CY2023Q4	us-gaap	Supplier Finance Program Obligation SupplierFinanceProgramObligation	4636000	usd
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	4896000	usd
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	5441000	usd
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	5399000	usd
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	39000	usd
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	0	usd
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	0	usd
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	13000	usd
CY2022	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	usd
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	usd
CY2023	us-gaap	Short Term Lease Cost ShortTermLeaseCost	123000	usd
CY2022	us-gaap	Short Term Lease Cost ShortTermLeaseCost	163000	usd
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	408000	usd
CY2023	us-gaap	Variable Lease Cost VariableLeaseCost	743000	usd
CY2022	us-gaap	Variable Lease Cost VariableLeaseCost	756000	usd
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	453000	usd
CY2023	us-gaap	Lease Cost LeaseCost	5814000	usd
CY2022	us-gaap	Lease Cost LeaseCost	6360000	usd
CY2021	us-gaap	Lease Cost LeaseCost	6260000	usd
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	3919000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	4015000	usd
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	5466000	usd
CY2023	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	13000	usd
CY2022	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	0	usd
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	0	usd
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	36000	usd
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	usd
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2621000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2303000	usd
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5584000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	291000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	usd
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	5003000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	5741000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2568000	usd
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3575000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	2542000	usd
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	2304000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	5110000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	5879000	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	330000	usd
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	0	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	39000	usd
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	0	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	291000	usd
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	0	usd
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	83000	usd
CY2022Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	0	usd
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	210000	usd
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	0	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	293000	usd
CY2022Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	0	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P2Y4M24D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P2Y1M6D
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P4Y1M6D
CY2022Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P0Y
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0663
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0465
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0793
CY2022Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	87000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	2640000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	87000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1700000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	87000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	891000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	53000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	264000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	31000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	30000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	0	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	345000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	5525000	usd
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	52000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	415000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	293000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	5110000	usd
CY2003	gti	Defined Benefit Plan Maximum Salary Increase DefinedBenefitPlanMaximumSalaryIncrease	0.06
CY2003	gti	Defined Benefit Plan Option To Remain In Plan Period DefinedBenefitPlanOptionToRemainInPlanPeriod	P5Y
CY2023Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	133100000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	129500000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	108377000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	107714000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0393
CY2022Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0443
CY2023Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0170
CY2022Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0171
CY2023	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0443
CY2022	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0214
CY2023	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0530
CY2022	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0350
CY2023	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.0171
CY2022	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.0146
CY2022	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	3000000	usd
CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	2500000	usd
CY2021Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	1088000	usd
CY2022	us-gaap	Product Warranty Expense ProductWarrantyExpense	456000	usd
CY2022	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	724000	usd
CY2022Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	820000	usd
CY2023	us-gaap	Product Warranty Expense ProductWarrantyExpense	25000	usd
CY2023	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	768000	usd
CY2023Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	77000	usd
CY2023Q4	gti	Related Party Tax Agreement Percent Of Savings RelatedPartyTaxAgreementPercentOfSavings	0.85
CY2023	gti	Due To Related Party Basis Spread On Variable Rate DueToRelatedPartyBasisSpreadOnVariableRate	0.0100
CY2023Q4	gti	Related Party Payable Tax Receivable Agreement RelatedPartyPayableTaxReceivableAgreement	11100000	usd
CY2023Q4	gti	Related Party Payable Tax Receivable Agreement Current RelatedPartyPayableTaxReceivableAgreementCurrent	5400000	usd
CY2023Q4	gti	Related Party Payable Tax Receivable Agreement Noncurrent RelatedPartyPayableTaxReceivableAgreementNoncurrent	5700000	usd
CY2022Q4	gti	Related Party Payable Tax Receivable Agreement RelatedPartyPayableTaxReceivableAgreement	15500000	usd
CY2022Q4	gti	Related Party Payable Tax Receivable Agreement Current RelatedPartyPayableTaxReceivableAgreementCurrent	4600000	usd
CY2022Q4	gti	Related Party Payable Tax Receivable Agreement Noncurrent RelatedPartyPayableTaxReceivableAgreementNoncurrent	10900000	usd
CY2023	gti	Change In Control Ownership Percentage Disposal Threshold For Payment Calculation ChangeInControlOwnershipPercentageDisposalThresholdForPaymentCalculation	1
	gti	Value Added Tax Assessment Amount ValueAddedTaxAssessmentAmount	28800000	usd
CY2019	gti	Value Added Tax Assessment Amount ValueAddedTaxAssessmentAmount	51000000	usd
CY2019	gti	Value Added Tax Assessment Amount ValueAddedTaxAssessmentAmount	51000000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-111821000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	55107000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-69087000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-161943000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	397211000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	525493000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-273764000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	452318000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	456406000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-129000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3590000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	645000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-12643000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	13302000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2132000	usd
CY2023	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-12772000	usd
CY2022	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	16892000	usd
CY2021	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	2777000	usd
CY2023	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	9738000	usd
CY2022	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	48744000	usd
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	71088000	usd
CY2023	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-15480000	usd
CY2022	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	3720000	usd
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-5789000	usd
CY2023	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	-5742000	usd
CY2022	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	52464000	usd
CY2021	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	65299000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-18514000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69356000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	68076000	usd
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-57490000	usd
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	94987000	usd
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	95845000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Gilti Amount EffectiveIncomeTaxRateReconciliationGiltiAmount	1041000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Gilti Amount EffectiveIncomeTaxRateReconciliationGiltiAmount	38153000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Gilti Amount EffectiveIncomeTaxRateReconciliationGiltiAmount	51016000	usd
CY2023	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	91000	usd
CY2022	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-39000	usd
CY2021	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	49000	usd
CY2023	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-282000	usd
CY2022	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-1259000	usd
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-2208000	usd
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	818000	usd
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2182000	usd
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1414000	usd
CY2023	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	311000	usd
CY2022	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	348000	usd
CY2021	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	537000	usd
CY2023	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-36000	usd
CY2022	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-40000	usd
CY2021	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-48000	usd
CY2023	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	16666000	usd
CY2022	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-25656000	usd
CY2021	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-38530000	usd
CY2023	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	2534000	usd
CY2022	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	34264000	usd
CY2021	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	43821000	usd
CY2023	gti	Effective Income Tax Rate Reconciliation Change In Control Related Compensation Amount EffectiveIncomeTaxRateReconciliationChangeInControlRelatedCompensationAmount	0	usd
CY2022	gti	Effective Income Tax Rate Reconciliation Change In Control Related Compensation Amount EffectiveIncomeTaxRateReconciliationChangeInControlRelatedCompensationAmount	-1432000	usd
CY2021	gti	Effective Income Tax Rate Reconciliation Change In Control Related Compensation Amount EffectiveIncomeTaxRateReconciliationChangeInControlRelatedCompensationAmount	10626000	usd
CY2023	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	24570000	usd
CY2022	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	0	usd
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	0	usd
CY2023	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1669000	usd
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-3624000	usd
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-6804000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-18514000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69356000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	68076000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	18088000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	15088000	usd
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CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	509000	usd
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CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	16220000	usd
CY2021	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	11500000	usd
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CY2021	us-gaap	Net Income Loss NetIncomeLoss	388330000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	257042843	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	258781843	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	266251097	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
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CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	66097	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	257042843	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	258791228	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	266317194	shares
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.99
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.48
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.46
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.99
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.48
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.46
CY2023	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	290449	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	243006	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	130624	shares
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3033561	shares
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2240655	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1499128	shares
CY2023	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	0	usd
CY2022	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	0	usd
CY2021	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	11511000	usd
CY2023	us-gaap	Pension And Other Postretirement Benefits Expense Reversal Of Expense Noncash PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash	3771000	usd
CY2022	us-gaap	Pension And Other Postretirement Benefits Expense Reversal Of Expense Noncash PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash	-9950000	usd
CY2021	us-gaap	Pension And Other Postretirement Benefits Expense Reversal Of Expense Noncash PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash	-5298000	usd
CY2023	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	757000	usd
CY2022	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	938000	usd
CY2021	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	1098000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-151000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1135000	usd
CY2023	us-gaap	Defined Benefit Plan Actuarial Gain Loss Immediate Recognition As Component In Net Periodic Benefit Cost Credit DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit	-3000000	usd
CY2022	us-gaap	Defined Benefit Plan Actuarial Gain Loss Immediate Recognition As Component In Net Periodic Benefit Cost Credit DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit	9600000	usd
CY2021	us-gaap	Defined Benefit Plan Actuarial Gain Loss Immediate Recognition As Component In Net Periodic Benefit Cost Credit DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit	3800000	usd
CY2023Q4	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2023Q4	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31

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2024 Q1 Form 10-K Financial Statement

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$EAF GRAFTECH INTERNATIONAL LTD Stock $eaf

2024 Q1 Form 10-K Financial Statement

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$EAF
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