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Note 8. Credit Facilities - Primary and Secondary Credit Facility Textuals (Details) $ in Millions | 12 Months Ended
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Jun. 30, 2020 USD ($)
Primary Credit Facility |
Line of Credit Facility, Maximum Borrowing Capacity | $ 150
Line of Credit Facility, Maximum Borrowing Capacity Upon Request | $ 225
Line of Credit Facility, Above the Adjusted LIBOR Rate to Calculate Alternate Base Rate | 1.00%
Line of Credit Facility, Above the Federal Funds Rate to Calculate Alternate Base Rate | 0.50%
Adjusted Leverage Ratio, Indebtedness Reduction For Excess Cash | $ 15
Adjusted Leverage Ratio Covenant | 3.0
Fixed Charge Coverage Ratio Covenant | 1.10
Secondary Credit Facility |
Line of Credit Facility, Maximum Borrowing Capacity | $ 30
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.50%
Line of Credit Facility, Eurocurrency Loans Spread | 0.02125
Line of Credit Facility, Above the Adjusted LIBOR Rate to Calculate Alternate Base Rate | 1.00%
Line of Credit Facility, Above the Federal Funds Rate to Calculate Alternate Base Rate | 0.50%
Line of Credit Facility, Alternate Base Rate Loans Spread | 0.01125
Adjusted Leverage Ratio, Indebtedness Reduction For Excess Cash | $ 15
Adjusted Leverage Ratio Covenant | 3.0
Fixed Charge Coverage Ratio Covenant | 1.10
Minimum | Primary Credit Facility |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.20%
Line of Credit Facility, Eurocurrency Loans Spread | 0.0125
Line of Credit Facility, Alternate Base Rate Loans Spread | 0.0025
Maximum | Primary Credit Facility |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.25%
Line of Credit Facility, Eurocurrency Loans Spread | 0.0175
Line of Credit Facility, Alternate Base Rate Loans Spread | 0.0075

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- Definition Adjusted Leverage Ratio Covenant + References No definition available. + Details
Name: | ke_AdjustedLeverageRatioCovenant
Namespace Prefix: | ke_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Adjusted Leverage Ratio, Indebtedness Reduction For Excess Cash + References No definition available. + Details
Name: | ke_AdjustedLeverageRatioIndebtednessReductionForExcessCash
Namespace Prefix: | ke_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fixed Charge Coverage Ratio Covenant + References No definition available. + Details
Name: | ke_FixedChargeCoverageRatioCovenant
Namespace Prefix: | ke_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility wihich may be available upon request and with the participating banks' consent, without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References No definition available. + Details
Name: | ke_LineOfCreditFacilityMaximumBorrowingCapacityUponRequest
Namespace Prefix: | ke_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of Credit Facility, Percent Above the Adjusted LIBOR Rate to Calculate Alternate Base Rate + References No definition available. + Details
Name: | ke_LineofCreditFacilityAbovetheAdjustedLIBORRatetoCalculateAlternateBaseRate
Namespace Prefix: | ke_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line of Credit Facility, Percent Above the Federal Funds Rate to Calculate Alternate Base Rate + References No definition available. + Details
Name: | ke_LineofCreditFacilityAbovetheFederalFundsRatetoCalculateAlternateBaseRate
Namespace Prefix: | ke_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line of Credit Facility, Alternate Base Rate Loans Spread + References No definition available. + Details
Name: | ke_LineofCreditFacilityAlternateBaseRateLoansSpread
Namespace Prefix: | ke_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Eurocurrency Loans Spread, added to LIBOR to calculate the interest rate on borrowings + References No definition available. + Details
Name: | ke_LineofCreditFacilityEurocurrencyLoansSpread
Namespace Prefix: | ke_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- 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=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=ke_PrimaryCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=ke_SecondaryCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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