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Restructuring and Related Chargesand Asset Impairment Charges - Narrative (Details) (USD $)
9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Incurred Cost $ 37,105,000us-gaap_RestructuringAndRelatedCostIncurredCost  
Restructuring Charges 24,389,000us-gaap_RestructuringCharges 5,013,000us-gaap_RestructuringCharges
Restructuring Charges Related to Inventory Disposals 252,000kmt_RestructuringChargesRelatedToInventoryDisposals  
Restructuring Related Charges Recorded in Cost of Goods Sold 6,500,000kmt_RestructuringRelatedChargesRecordedInCostOfGoodsSold  
Restructuring Related Charges Recorded in Operating Expenses 6,176,000kmt_RestructuringRelatedChargesRecordedInOperatingExpenses  
Industrial [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 12,909,000us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_IndustrialMember
2,636,000us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_IndustrialMember
Infrastructure [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 11,480,000us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_InfrastructureMember
2,377,000us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_InfrastructureMember
Phase 1 [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Cost Incurred to Date 44,200,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= kmt_Phase1Member
 
Phase 1 [Member] | Minimum [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Expected Cost 55,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RestructuringPlanAxis
= kmt_Phase1Member
 
Phase 1 [Member] | Maximum [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Expected Cost 60,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RestructuringPlanAxis
= kmt_Phase1Member
 
Phase 1 [Member] | Industrial [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Expected Cost Percent 50.00%kmt_RestructuringandRelatedCostExpectedCostPercent
/ us-gaap_RestructuringPlanAxis
= kmt_Phase1Member
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_IndustrialMember
 
Restructuring and Related Cost, Cost Incurred to Date 27,109,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= kmt_Phase1Member
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_IndustrialMember
 
Phase 1 [Member] | Infrastructure [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Expected Cost Percent 50.00%kmt_RestructuringandRelatedCostExpectedCostPercent
/ us-gaap_RestructuringPlanAxis
= kmt_Phase1Member
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_InfrastructureMember
 
Restructuring and Related Cost, Cost Incurred to Date 14,905,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= kmt_Phase1Member
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_InfrastructureMember
 
Phase 1 [Member] | Corporate Segment [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Cost Incurred to Date 2,186,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= kmt_Phase1Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
 
Phase 2 [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Cost Incurred to Date 11,991,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= kmt_Phase2Member
 
Phase 2 [Member] | Minimum [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Expected Cost 90,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RestructuringPlanAxis
= kmt_Phase2Member
 
Phase 2 [Member] | Maximum [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Expected Cost 100,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RestructuringPlanAxis
= kmt_Phase2Member
 
Phase 2 [Member] | Industrial [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Expected Cost Percent 75.00%kmt_RestructuringandRelatedCostExpectedCostPercent
/ us-gaap_RestructuringPlanAxis
= kmt_Phase2Member
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_IndustrialMember
 
Restructuring and Related Cost, Cost Incurred to Date 6,085,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= kmt_Phase2Member
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_IndustrialMember
 
Phase 2 [Member] | Infrastructure [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Expected Cost Percent 25.00%kmt_RestructuringandRelatedCostExpectedCostPercent
/ us-gaap_RestructuringPlanAxis
= kmt_Phase2Member
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_InfrastructureMember
 
Restructuring and Related Cost, Cost Incurred to Date 5,679,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= kmt_Phase2Member
/ us-gaap_StatementBusinessSegmentsAxis
= kmt_InfrastructureMember
 
Phase 2 [Member] | Corporate Segment [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Cost Incurred to Date $ 227,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= kmt_Phase2Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember