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Supplemental Cash Flow Disclosures (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Cash paid during the period for: |  |
Interest | $ 23,981 us-gaap_InterestPaidNet | $ 22,038 us-gaap_InterestPaidNet
Income taxes | 35,700 us-gaap_IncomeTaxesPaidNet | 33,155 us-gaap_IncomeTaxesPaidNet
Change in accounts payable related to property, plant, and equipment | $ 6,470 kmt_Changeinaccountspayablerelatedtopurchasesofpropertyplantandequipment | $ 8,600 kmt_Changeinaccountspayablerelatedtopurchasesofpropertyplantandequipment

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Change in accounts payable related to purchases of property plant and equipment + References No definition available. + Details
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Namespace Prefix: | kmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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Period Type: | duration

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- Definition The amount of cash paid for interest during the period net of cash paid for interest that is capitalized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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