XML 93 R77.htm IDEA: XBRL DOCUMENT v3.25.0.1

Pensions and other postretirement benefit plans - Schedule of Assumptions Used to Determine Defined Benefit Plans Year-End Benefit Obligations (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans
Weighted average discount rate			5.05%	2.95%
Pension benefits
Defined Benefit Plans and Other Postretirement Benefit Plans
Weighted average discount rate	5.70%	5.10%
Rate of increase in future compensation levels	2.00%	2.00%
Postretirement benefits
Defined Benefit Plans and Other Postretirement Benefit Plans
Weighted average discount rate	5.80%	5.40%
Current year medical trend	7.50%	6.30%
Ultimate year medical trend	4.50%	4.50%
Year of ultimate trend	2037	2031

X

- Definition

Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year 1

+ References

No definition available.

+ Details

Name:	gci_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear1
Namespace Prefix:	gci_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Defined Benefit Plan Ultimate Health Care Cost Trend Rate 2

+ References

No definition available.

+ Details

Name:	gci_DefinedBenefitPlanUltimateHealthCareCostTrendRate2
Namespace Prefix:	gci_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate 1

+ References

No definition available.

+ Details

Name:	gci_DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate1
Namespace Prefix:	gci_
Data Type:	dtr-types1:gYearListItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
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_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PostemploymentRetirementBenefitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: