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v3.19.3

Subsequent Events Subsequent Events (Details) $ in Millions | Sep. 30, 2019 USD ($)
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Non-core business sold to AMG [Member] |
Subsequent Event [Line Items] |
Carrying value | $ 27

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- Definition Carrying value + References No definition available. + Details
Name: | kmt_Carryingvalue
Namespace Prefix: | kmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | kmt_PortfolioofBusinessesforStrategicAlternativesAxis=kmt_NoncorebusinesssoldtoAMGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |