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Segment Data - Narrative (Details) $ in Millions | 12 Months Ended
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Jun. 30, 2017 USD ($) Segment | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($)
Segment Data [Abstract] |  |  |
Operations in Number of Global Reporting Segments | Segment | 3 |  |
Sales To a Single Customer Did Not Aggretage More Than | 0.04 |  |
Export Sales from U.S. Operations to Unaffiliated Customers | $ | $ 58.6 | $ 65.3 | $ 71.0

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- Definition Export sales from us operations to unaffiliated customers. + References No definition available. + Details
Name: | kmt_ExportSalesFromUsOperationsToUnaffiliatedCustomers
Namespace Prefix: | kmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Sales to a single customer did not aggregate more than. + References No definition available. + Details
Name: | kmt_SalesToaSingleCustomerDidNotAggregateMoreThan
Namespace Prefix: | kmt_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Segment Data [Abstract] + References No definition available. + Details
Name: | kmt_SegmentDataAbstract
Namespace Prefix: | kmt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration