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Schedule II Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Jun. 30, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts | Valuation and Qualifying Accounts
Description | Balance at Beginning of Year |  | Additions (Reductions) to Expense |  | Adjustments to Other Accounts |  | Write-offs and Recoveries |  | Balance at End of Year
(Amounts in Thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Ended June 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowances: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables |  | $ | 523 |  |  |  | $ | (163) |  |  |  | $ | (9) |  |  |  | $ | (174) |  |  |  | $ | 177 |
Deferred Tax Asset |  | $ | 1,637 |  |  |  | $ | 165 |  |  |  | $ | — |  |  |  | $ | — |  |  |  | $ | 1,802 |
Year Ended June 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowances: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables |  | $ | 270 |  |  |  | $ | 265 |  |  |  | $ | (5) |  |  |  | $ | (7) |  |  |  | $ | 523 |
Deferred Tax Asset |  | $ | 658 |  |  |  | $ | 979 |  |  |  | $ | — |  |  |  | $ | — |  |  |  | $ | 1,637 |
Year Ended June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowances: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables |  | $ | 482 |  |  |  | $ | 184 |  |  |  | $ | 14 |  |  |  | $ | (410) |  |  |  | $ | 270 |
Deferred Tax Asset |  | $ | 638 |  |  |  | $ | 20 |  |  |  | $ | — |  |  |  | $ | — |  |  |  | $ | 658 |

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- Definition Tabular disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References No definition available. + Details
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Namespace Prefix: | ke_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration