XML 53 R42.htm IDEA: XBRL DOCUMENT v3.22.1

Debt And Liquidity (2018 Term Loan Facility) (Details) - 2018 Term Loan Facility - USD ($)	3 Months Ended
	Mar. 31, 2022	Feb. 28, 2021	Feb. 28, 2018
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,250,000,000		$ 1,500,000,000
Equity Interest Pledge	65.00%
Debt Instrument, Annual Amortization Rate, Amount	$ 112,500,000
Repayment Of Excess Cashflow Percentage	75.00%
Ratio of Indebtedness to Net Capital	4.00
Contingent Event One
Debt Instrument [Line Items]
Repayment Of Excess Cashflow Percentage	50.00%
Contingent Event Two
Debt Instrument [Line Items]
Repayment Of Excess Cashflow Percentage	0.00%
Minimum
Debt Instrument [Line Items]
Debt Instrument, Variable Rate	0.50%	1.00%
Minimum | Contingent Event One
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital	1.25
Maximum | Contingent Event One
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital	1.75
Adjusted LIBO Rate
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.00%
Debt Instrument, Basis Spread on Variable Rate, Increase (Decrease)	(0.50%)
Debt Instrument, Basis Spread on Variable Rate, Decrease Upon Achievement Of Specific Credit Ratings	0.25%
ABR
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%

X

- Definition

Debt Instrument, Annual Amortization Rate, Amount

+ References

No definition available.

+ Details

Name:	gti_DebtInstrumentAnnualAmortizationRateAmount
Namespace Prefix:	gti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Debt Instrument, Basis Spread on Variable Rate, Decrease Upon Achievement Of Specific Credit Ratings

+ References

No definition available.

+ Details

Name:	gti_DebtInstrumentBasisSpreadOnVariableRateDecreaseUponAchievementOfSpecificCreditRatings
Namespace Prefix:	gti_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Debt Instrument, Basis Spread on Variable Rate, Increase (Decrease)

+ References

No definition available.

+ Details

Name:	gti_DebtInstrumentBasisSpreadOnVariableRateIncreaseDecrease
Namespace Prefix:	gti_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Debt Instrument, Variable Rate

+ References

No definition available.

+ Details

Name:	gti_DebtInstrumentVariableRate
Namespace Prefix:	gti_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Equity Interest Pledge

+ References

No definition available.

+ Details

Name:	gti_EquityInterestPledge
Namespace Prefix:	gti_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Repayment Of Excess Cashflow Percentage

+ References

No definition available.

+ Details

Name:	gti_RepaymentOfExcessCashflowPercentage
Namespace Prefix:	gti_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

Name:	us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentAxis=gti_A2018TermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gti_ContingentEventAxis=gti_ContingentEventOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gti_ContingentEventAxis=gti_ContingentEventTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=gti_AdjustedLIBORateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=gti_ABRMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: