XML 91 R69.htm IDEA: XBRL DOCUMENT
v3.22.4

Debt And Liquidity (2020 Senior Notes) (Details) $ in Millions | 1 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2022
Debt Instrument [Line Items] |  |
Debt Instrument, Event Of Default, Percentage Of Debt Held | 30.00% |
Secured Debt |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 500 |
Debt Instrument, Covenant, Restricted Payments Allowable With No Default Or Event Of Default, Pro Forma Consolidated First Lien Net Leverage Ratio, Maximum | 2.00 |
Debt Instrument, Covenant, Restricted Payments Allowable Pursuant To Certain Baskets, Pro Forma Consolidated First Lien Net Leverage Ratio, Maximum | 2.00 |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.625%
Secured Debt | Prior to December 15, 2023 |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 40.00% |
Redemption price related to net cash proceeds of certain equity offerings | 104.625% |
Debt Instrument, Redemption Price, Premium Applicable, Percentage | 100.00% |

X
- Definition Debt Instrument, Covenant, Restricted Payments Allowable Pursuant To Certain Baskets, Pro Forma Consolidated First Lien Net Leverage Ratio, Maximum + References No definition available. + Details
Name: | gti_DebtInstrumentCovenantRestrictedPaymentsAllowablePursuantToCertainBasketsProFormaConsolidatedFirstLienNetLeverageRatioMaximum
Namespace Prefix: | gti_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Covenant, Restricted Payments Allowable With No Default Or Event Of Default, Pro Forma Consolidated First Lien Net Leverage Ratio, Maximum + References No definition available. + Details
Name: | gti_DebtInstrumentCovenantRestrictedPaymentsAllowableWithNoDefaultOrEventOfDefaultProFormaConsolidatedFirstLienNetLeverageRatioMaximum
Namespace Prefix: | gti_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Event Of Default, Percentage Of Debt Held + References No definition available. + Details
Name: | gti_DebtInstrumentEventOfDefaultPercentageOfDebtHeld
Namespace Prefix: | gti_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Redemption Price, Premium Applicable, Percentage + References No definition available. + Details
Name: | gti_DebtInstrumentRedemptionPricePremiumApplicablePercentage
Namespace Prefix: | gti_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI https://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of principal amount of debt redeemed. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |