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

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- Definition Amount of costs incurred to date for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + 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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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