Employee Benefit Plan, Description of Plan (Details) - ke:EBP001 - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
EBP, Description of Plan [Line Items]
EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage	50.00%
EBP, Participant Contribution, Automatic, Deferral Rate	5.00%
Automatic Annual Participant Contribution Percentage Increase	1.00%
Maximum Participant % for Annual Increase	20.00%
AnnualCompanyDiscretionaryContribution	0.00%
EBP, Employer Contribution, Matching Percentage	50.00%
EBP, Employer Contribution, Participant Compensation Matched, Percentage	6.00%
VestingPercentageofContributions	100.00%
EBP, Forfeited Nonvested Account	$ 0	$ 0
EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount	1,000
EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount	$ 50,000
EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage	50.00%
NoteReceivableFromParticipantMaximumBorrowingTermOnGeneralLoan	5 years
NoteReceivableFromParticipantMaximumBorrowingTermPrimaryResidence	10 years
ParticipantLoanBasisSpreadOnVariableRate	2.00%
Minimum
EBP, Description of Plan [Line Items]
EBP, Asset Held for Investment, Participant Loan, Interest Rate	5.25%
Maximum
EBP, Description of Plan [Line Items]
EBP, Asset Held for Investment, Participant Loan, Interest Rate	10.50%

AnnualCompanyDiscretionaryContribution

No definition available.

Name:	ke_AnnualCompanyDiscretionaryContribution
Namespace Prefix:	ke_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

AutomaticAnnualParticipantContributionPercentageIncrease

+ References

No definition available.

+ Details

Name:	ke_AutomaticAnnualParticipantContributionPercentageIncrease
Namespace Prefix:	ke_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

MaximumParticipant%forAnnualIncrease

+ References

No definition available.

+ Details

Name:	ke_MaximumParticipantforAnnualIncrease
Namespace Prefix:	ke_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

NoteReceivableFromParticipantMaximumBorrowingTermOnGeneralLoan

+ References

No definition available.

+ Details

Name:	ke_NoteReceivableFromParticipantMaximumBorrowingTermOnGeneralLoan
Namespace Prefix:	ke_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

NoteReceivableFromParticipantMaximumBorrowingTermPrimaryResidence

+ References

No definition available.

+ Details

Name:	ke_NoteReceivableFromParticipantMaximumBorrowingTermPrimaryResidence
Namespace Prefix:	ke_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

ParticipantLoanBasisSpreadOnVariableRate

+ References

No definition available.

+ Details

Name:	ke_ParticipantLoanBasisSpreadOnVariableRate
Namespace Prefix:	ke_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

VestingPercentageofContributions

+ References

No definition available.

+ Details

Name:	ke_VestingPercentageofContributions
Namespace Prefix:	ke_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-SubTopic 205
-Topic 962
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of plan asset, in forfeited nonvested account, no longer allocated to participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(D)
-Publisher DOL-EBSA

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=ke_EBP001Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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