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Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
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Mar. 31, 2015 | Jun. 30, 2014
The components of intangible assets |  |
Accumulated amortization | (145,244)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | $ (139,245)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible Assets, Gross (Excluding Goodwill) | 436,185 us-gaap_IntangibleAssetsGrossExcludingGoodwill | 482,421 us-gaap_IntangibleAssetsGrossExcludingGoodwill
Trademarks [Member] |  |
The components of intangible assets |  |
Gross carrying amount, Indefinite | 24,193 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 37,259 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Contract-based [Member] |  |
The components of intangible assets |  |
Gross carrying amount, finite | 8,509 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractualRightsMember | 23,446 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractualRightsMember
Accumulated amortization | (6,781)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractualRightsMember | (10,820)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractualRightsMember
Technology-based and other [Member] |  |
The components of intangible assets |  |
Gross carrying amount, finite | 52,186 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = kmt_TechnologyBasedAndOtherMember | 54,842 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = kmt_TechnologyBasedAndOtherMember
Accumulated amortization | (28,644)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = kmt_TechnologyBasedAndOtherMember | (28,516)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = kmt_TechnologyBasedAndOtherMember
Customer-related [Member] |  |
The components of intangible assets |  |
Gross carrying amount, finite | 273,790 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 285,751 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated amortization | (84,640)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (76,376)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Unpatented technology [Member] |  |
The components of intangible assets |  |
Gross carrying amount, finite | 59,092 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | 61,867 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember
Accumulated amortization | (13,679)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | (12,549)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember
Trademarks [Member] |  |
The components of intangible assets |  |
Gross carrying amount, finite | 18,415 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 19,256 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Accumulated amortization | (11,500)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | $ (10,984)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Minimum [Member] | Contract-based [Member] |  |
The components of intangible assets |  |
Useful life related to technology-based intangible assets | 3 years |
Minimum [Member] | Technology-based and other [Member] |  |
The components of intangible assets |  |
Useful life related to technology-based intangible assets | 4 years |
Minimum [Member] | Customer-related [Member] |  |
The components of intangible assets |  |
Useful life related to technology-based intangible assets | 10 years |
Minimum [Member] | Unpatented technology [Member] |  |
The components of intangible assets |  |
Useful life related to technology-based intangible assets | 10 years |
Minimum [Member] | Trademarks [Member] |  |
The components of intangible assets |  |
Useful life related to technology-based intangible assets | 5 years |
Maximum [Member] | Contract-based [Member] |  |
The components of intangible assets |  |
Useful life related to technology-based intangible assets | 15 years |
Maximum [Member] | Technology-based and other [Member] |  |
The components of intangible assets |  |
Useful life related to technology-based intangible assets | 20 years |
Maximum [Member] | Customer-related [Member] |  |
The components of intangible assets |  |
Useful life related to technology-based intangible assets | 21 years |
Maximum [Member] | Unpatented technology [Member] |  |
The components of intangible assets |  |
Useful life related to technology-based intangible assets | 30 years |
Maximum [Member] | Trademarks [Member] |  |
The components of intangible assets |  |
Useful life related to technology-based intangible assets | 20 years |

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