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v3.20.2

Segment Data Segment Data - Sales by End Market (Details) | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
General Engineering [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 46.00% | 45.00% | 41.00%
Transportation [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 17.00% | 18.00% | 20.00%
Energy [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 16.00% | 17.00% | 17.00%
Earthworks [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 14.00% | 13.00% | 14.00%
Aerospace and defense [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 7.00% | 7.00% | 8.00%
Industrial [Member] | General Engineering [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 45.00% | 44.00% | 43.00%
Industrial [Member] | Transportation [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 32.00% | 34.00% | 36.00%
Industrial [Member] | Energy [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 9.00% | 9.00% | 9.00%
Industrial [Member] | Aerospace and defense [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 14.00% | 13.00% | 12.00%
WIDIA [Member] | General Engineering [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 100.00% | 100.00% | 100.00%
Infrastructure [Member] | General Engineering [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 34.00% | 34.00% | 31.00%
Infrastructure [Member] | Energy [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 28.00% | 33.00% | 33.00%
Infrastructure [Member] | Earthworks [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 38.00% | 33.00% | 36.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
Name: | srt_MajorCustomersAxis=kmt_TransportationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |

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- Details
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- Details
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Period Type: |

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- Details
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Period Type: |