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v3.21.2

Segment Data Segment Data - Sales by End Market (Details) | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
General Engineering [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 47.00% | 46.00% | 45.00%
Transportation [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 19.00% | 17.00% | 18.00%
Energy [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 15.00% | 16.00% | 17.00%
Earthworks [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 14.00% | 14.00% | 13.00%
Aerospace and defense [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 5.00% | 7.00% | 7.00%
Metal Cutting [Member] | General Engineering [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 54.00% | 53.00% | 52.00%
Metal Cutting [Member] | Transportation [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 30.00% | 27.00% | 29.00%
Metal Cutting [Member] | Energy [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 8.00% | 8.00% | 8.00%
Metal Cutting [Member] | Aerospace and defense [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 8.00% | 12.00% | 11.00%
Infrastructure [Member] | General Engineering [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 35.00% | 34.00% | 34.00%
Infrastructure [Member] | Energy [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 26.00% | 28.00% | 33.00%
Infrastructure [Member] | Earthworks [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenues, percent | 39.00% | 38.00% | 33.00%

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- Definition Revenues, percent + References No definition available. + Details
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Data Type: | num:percentItemType
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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | srt_MajorCustomersAxis=kmt_TransportationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=kmt_EnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=kmt_EarthworksMember
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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Balance Type: |
Period Type: |

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