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Goodwill and Other Intangible Assets - Carrying Amount of Goodwill Attributable to Each Segment (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Jun. 30, 2014
Goodwill [Roll Forward] |  |
Goodwill | $ 1,090,225,000 us-gaap_GoodwillGross | $ 1,126,418,000 us-gaap_GoodwillGross
Accumulated impairment losses | (678,342,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (150,842,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill, Beginning Balance | 975,576,000 us-gaap_Goodwill |
Goodwill, Acquired During Period | 2,984,000 us-gaap_GoodwillAcquiredDuringPeriod |
Translation | (39,177,000)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments |
Change in goodwill | (36,193,000)us-gaap_GoodwillPeriodIncreaseDecrease |
Goodwill, Impairment Loss | (527,500,000)us-gaap_GoodwillImpairmentLoss |
Goodwill, Ending Balance | 411,883,000 us-gaap_Goodwill |
Industrial [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 450,411,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember | 472,337,000 us-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 | 321,495,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Goodwill, Acquired During Period | 2,984,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Translation | (24,910,000)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Change in goodwill | (21,926,000)us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Goodwill, Impairment Loss | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Goodwill, Ending Balance | 299,569,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember |
Infrastructure [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 639,814,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember | 654,081,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Accumulated impairment losses | (527,500,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Goodwill, Beginning Balance | 654,081,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |
Goodwill, Acquired During Period | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |
Translation | (14,267,000)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |
Change in goodwill | (14,267,000)us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |
Goodwill, Impairment Loss | (527,500,000)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |
Goodwill, Ending Balance | $ 112,314,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember |

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- 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 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount before 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 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition 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 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 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) 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 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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