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v3.21.2

Note 5. Property and Equipment - Asset Lives (Details) | 12 Months Ended
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Jun. 30, 2021
Leasehold Improvements, Range of Lives | Lesser of Useful Life or Term of Lease
Building and Building Improvements | Minimum |
Property, Plant and Equipment, Useful Life | 5 years
Building and Building Improvements | Maximum |
Property, Plant and Equipment, Useful Life | 40 years
Machinery and Equipment | Minimum |
Property, Plant and Equipment, Useful Life | 3 years
Machinery and Equipment | Maximum |
Property, Plant and Equipment, Useful Life | 11 years
Land Use Rights |
Property, Plant and Equipment, Useful Life | 39 years

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- Definition The range of lives of leasehold improvements used in the normal conduct of business and not intended for resale. + References No definition available. + Details
Name: | ke_LeaseholdImprovementsRangeOfLives
Namespace Prefix: | ke_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
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: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ke_LandUseRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |