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Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
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) 436,185us-gaap_IntangibleAssetsGrossExcludingGoodwill 482,421us-gaap_IntangibleAssetsGrossExcludingGoodwill
Trademarks [Member]    
The components of intangible assets    
Gross carrying amount, Indefinite 24,193us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
37,259us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Contract-based [Member]    
The components of intangible assets    
Gross carrying amount, finite 8,509us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ContractualRightsMember
23,446us-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 52,186us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= kmt_TechnologyBasedAndOtherMember
54,842us-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 273,790us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
285,751us-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 59,092us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnpatentedTechnologyMember
61,867us-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 18,415us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
19,256us-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