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Segment Data Segment Data - Sales by End Market (Details) | 12 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2013
Revenue from External Customer [Line Items] |  |  |
Sales by End Market | 100.00% | 100.00% | 100.00%
General Engineering [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales by End Market | 36.00% | 31.00% | 29.00%
Transportation [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales by End Market | 21.00% | 21.00% | 21.00%
Energy [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales by End Market | 19.00% | 23.00% | 23.00%
Earthworks [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales by End Market | 17.00% | 19.00% | 20.00%
Aerospace and Defense [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales by End Market | 7.00% | 6.00% | 7.00%

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- Definition Sales by End Market + References No definition available. + Details
Name: | kmt_SalesbyEndMarket
Namespace Prefix: | kmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_MajorCustomersAxis=kmt_GeneralEngineeringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_MajorCustomersAxis=kmt_EarthworksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=kmt_AerospaceandDefenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |