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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