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Note 1. Business Description and Summary of Significant Accounting Policies - Components of Non-operating income (expense), net (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Foreign Currency/Derivative Gain (Loss) | $ 2,422 | $ (1,113)
Gain (loss) on SERP investments | 550 | (22)
Other | (21) | (77)
Non-operating income (expense), net | $ 2,951 | $ (1,212)

X
- Definition The aggregate foreign currency transaction gain (loss) (both realized and unrealized), foreign currency remeasurement gain (loss), and foreign currency derivative gain (loss) included in determining net income for the reporting period, on a pre-tax basis + References No definition available. + Details
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Balance Type: | credit
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X
- Definition Amount of miscellaneous income (expense) related to Other Nonoperating Income (Expense) + References No definition available. + Details
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Namespace Prefix: | ke_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The sum of the realized and unrealized net gain (loss) on trading securities during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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