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Goodwill and Other Intangible Assets (Details) (USD $)	6 Months Ended
	Dec. 31, 2014	Jun. 30, 2014
Goodwill [Roll Forward]
Goodwill	$ 1,105,409,000us-gaap_GoodwillGross	$ 1,126,418,000us-gaap_GoodwillGross
Accumulated impairment losses	(525,842,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	(150,842,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill, Beginning Balance	975,576,000us-gaap_Goodwill
Goodwill, Acquired During Period	2,984,000us-gaap_GoodwillAcquiredDuringPeriod
Translation	(23,993,000)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Change in goodwill	(21,009,000)us-gaap_GoodwillPeriodIncreaseDecrease
Goodwill, Impairment Loss	(375,000,000)us-gaap_GoodwillImpairmentLoss
Goodwill, Ending Balance	579,567,000us-gaap_Goodwill
Industrial [Member]
Goodwill [Roll Forward]
Goodwill	464,239,000us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	472,337,000us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Accumulated impairment losses	(150,842,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	(150,842,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Goodwill, Beginning Balance	321,495,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Goodwill, Acquired During Period	2,984,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Translation	(11,082,000)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Change in goodwill	(8,098,000)us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Goodwill, Impairment Loss	0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Goodwill, Ending Balance	313,397,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Infrastructure [Member]
Goodwill [Roll Forward]
Goodwill	641,170,000us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	654,081,000us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Accumulated impairment losses	(375,000,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Goodwill, Beginning Balance	654,081,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Goodwill, Acquired During Period	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Translation	(12,911,000)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Change in goodwill	(12,911,000)us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Goodwill, Impairment Loss	(375,000,000)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Goodwill, Ending Balance	$ 266,170,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember

X

- Definition

Amount after accumulated impairment loss of an asset representing 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 350

-SubTopic 20

-Section 50

-Paragraph 1

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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

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-Publisher FASB

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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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