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Goodwill and Other Intangible Assets (Details) (USD $) | 6 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Jun. 30, 2014
Goodwill [Roll Forward] |  |
Goodwill | $ 1,105,409,000us-gaap_GoodwillGross | $ 1,126,418,000us-gaap_GoodwillGross
Accumulated impairment losses | (525,842,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (150,842,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill, Beginning Balance | 975,576,000us-gaap_Goodwill |
Goodwill, Acquired During Period | 2,984,000us-gaap_GoodwillAcquiredDuringPeriod |
Translation | (23,993,000)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments |
Change in goodwill | (21,009,000)us-gaap_GoodwillPeriodIncreaseDecrease |
Goodwill, Impairment Loss | (375,000,000)us-gaap_GoodwillImpairmentLoss |
Goodwill, Ending Balance | 579,567,000us-gaap_Goodwill |
Industrial [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 464,239,000us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember | 472,337,000us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Accumulated impairment losses | (150,842,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember | (150,842,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Goodwill, Beginning Balance | 321,495,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Goodwill, Acquired During Period | 2,984,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Translation | (11,082,000)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Change in goodwill | (8,098,000)us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Goodwill, Impairment Loss | 0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Goodwill, Ending Balance | 313,397,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Infrastructure [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 641,170,000us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember | 654,081,000us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Accumulated impairment losses | (375,000,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Goodwill, Beginning Balance | 654,081,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |
Goodwill, Acquired During Period | 0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |
Translation | (12,911,000)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |
Change in goodwill | (12,911,000)us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |
Goodwill, Impairment Loss | (375,000,000)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |
Goodwill, Ending Balance | $ 266,170,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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