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v3.10.0.1

Revenue Recognition Details (Details) | 3 Months Ended
--- | ---
Sep. 30, 2018
Revenue from Contract with Customer [Abstract] |
Payment terms, minimum | 30
Payment terms, maximum | 90

X
- Definition Payment terms, maximum + References No definition available. + Details
Name: | kmt_Paymenttermsmaximum
Namespace Prefix: | kmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payment terms, minimum + References No definition available. + Details
Name: | kmt_Paymenttermsminimum
Namespace Prefix: | kmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration