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Restructuring and Related Charges (Details Textual) (USD $)	6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 20,381,000us-gaap_RestructuringAndRelatedCostIncurredCost
Restructuring Charges	8,613,000us-gaap_RestructuringCharges	2,310,000us-gaap_RestructuringCharges
Restructuring Charges Related to Inventory Disposals	211,000kmt_RestructuringChargesRelatedToInventoryDisposals
Restructuring Related Charges Recorded in Cost of Goods Sold	6,300,000kmt_RestructuringRelatedChargesRecordedInCostOfGoodsSold
Restructuring Related Charges Recorded in Operating Expenses	5,518,000kmt_RestructuringRelatedChargesRecordedInOperatingExpenses
Restructuring and Related Cost, Cost Incurred to Date	39,462,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
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
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
Industrial [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	3,871,000us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Restructuring and Related Cost, Expected Cost Percent	50.00%kmt_RestructuringandRelatedCostExpectedCostPercent / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Restructuring and Related Cost, Cost Incurred to Date	24,521,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1 / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4,742,000us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Restructuring and Related Cost, Expected Cost Percent	50.00%kmt_RestructuringandRelatedCostExpectedCostPercent / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Restructuring and Related Cost, Cost Incurred to Date	13,097,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1 / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	$ 1,844,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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- Definition

Expected total restructuring and related cost for reporting segment as a percent of total

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Restructuring charges related to inventory disposals.

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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

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Amount expected to be recognized in earnings for the specified restructuring cost.

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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.

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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.

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