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Goodwill and Other Intangible Assets (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2014
Goodwill and Other Intangible Assets (Additional Textual) [Abstract] |  |  |  |  |
Goodwill, Impairment Loss |  |  | $ 375,000,000us-gaap_GoodwillImpairmentLoss |  |
Goodwill | 579,567,000us-gaap_Goodwill |  | 579,567,000us-gaap_Goodwill |  | 975,576,000us-gaap_Goodwill
Amortization expense for intangible assets | 6,931,000us-gaap_AmortizationOfIntangibleAssets | 6,524,000us-gaap_AmortizationOfIntangibleAssets | 13,959,000us-gaap_AmortizationOfIntangibleAssets | 11,667,000us-gaap_AmortizationOfIntangibleAssets |
Unfavorable foreign currency translation adjustment |  |  | (7,100,000)kmt_IncreaseDecreaseInIntangibleAssetsDueToForeignCurrencyTranslationAdjustments |  |
Infrastructure [Member] |  |  |  |  |
Goodwill and Other Intangible Assets (Additional Textual) [Abstract] |  |  |  |  |
Goodwill and Intangible Asset Impairment |  |  | 376,500,000kmt_GoodwillandOtherIntangibleAssetImpairment / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  |
Goodwill, Impairment Loss |  |  | 375,000,000us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  |
Goodwill | 266,170,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  | 266,170,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  | 654,081,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Infrastructure [Member] | Infrastructure Technology Asset [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Asset Write-Down |  |  | 10,500,000kmt_IntangibleAssetWriteDown / kmt_InfrastructureTechnologyAssetAxis = kmt_InfrastructureTechnologyAssetMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  |
Goodwill and Other Intangible Assets (Additional Textual) [Abstract] |  |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  | 5,500,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / kmt_InfrastructureTechnologyAssetAxis = kmt_InfrastructureTechnologyAssetMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  |
Reduction of Liability |  |  | 5,000,000kmt_ReductionofLiability / kmt_InfrastructureTechnologyAssetAxis = kmt_InfrastructureTechnologyAssetMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  |
Infrastructure [Member] | Minimum [Member] | Portfolio of Businesses for Strategic Alternatives [Member] |  |  |  |  |
Goodwill and Other Intangible Assets (Additional Textual) [Abstract] |  |  |  |  |
Net Book Value | 150,000,000kmt_NetBookValue / kmt_PortfolioofBusinessesforStrategicAlternativesAxis = kmt_PortfolioofBusinessesforStrategicAlternativesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  | 150,000,000kmt_NetBookValue / kmt_PortfolioofBusinessesforStrategicAlternativesAxis = kmt_PortfolioofBusinessesforStrategicAlternativesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  |
Infrastructure [Member] | Maximum [Member] | Portfolio of Businesses for Strategic Alternatives [Member] |  |  |  |  |
Goodwill and Other Intangible Assets (Additional Textual) [Abstract] |  |  |  |  |
Net Book Value | 200,000,000kmt_NetBookValue / kmt_PortfolioofBusinessesforStrategicAlternativesAxis = kmt_PortfolioofBusinessesforStrategicAlternativesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  | 200,000,000kmt_NetBookValue / kmt_PortfolioofBusinessesforStrategicAlternativesAxis = kmt_PortfolioofBusinessesforStrategicAlternativesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  |
Infrastructure [Member] | Infrastructure Indefinite-Lived Trademark Asset [Member] |  |  |  |  |
Goodwill and Other Intangible Assets (Additional Textual) [Abstract] |  |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  | $ 1,500,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / kmt_InfrastructureIndefiniteLivedTrademarkAssetAxis = kmt_InfrastructureIndefiniteLivedTrademarkAssetMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of loss from the write-down of an asset representing the 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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