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Condensed Consolidated Statement of Share Owners' Equity Parentheticals - shares	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Performance Share Issuance, Shares	144,000	156,000

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- Definition

Number of shares issued during the period for Performance Shares.

+ References

No definition available.

+ Details

Name:	ke_PerformanceShareIssuanceShares
Namespace Prefix:	ke_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration