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Segment Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
External sales:
Total sales	$ 675,631us-gaap_SalesRevenueNet	$ 689,936us-gaap_SalesRevenueNet	$ 1,370,572us-gaap_SalesRevenueNet	$ 1,309,743us-gaap_SalesRevenueNet
Operating income:
Total operating (loss) income	(333,771)us-gaap_OperatingIncomeLoss	49,716us-gaap_OperatingIncomeLoss	(272,751)us-gaap_OperatingIncomeLoss	108,545us-gaap_OperatingIncomeLoss
Interest expense	7,960us-gaap_InterestExpense	8,037us-gaap_InterestExpense	16,170us-gaap_InterestExpense	15,118us-gaap_InterestExpense
Other expense, net	2,223us-gaap_OtherNonoperatingIncomeExpense	856us-gaap_OtherNonoperatingIncomeExpense	409us-gaap_OtherNonoperatingIncomeExpense	1,466us-gaap_OtherNonoperatingIncomeExpense
(Loss) income before income taxes	(343,954)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	40,823us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(289,330)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	91,961us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Industrial [Member]
External sales:
Total sales	371,557us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	370,647us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	749,415us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	708,876us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Operating income:
Total operating (loss) income	41,795us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	33,218us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	85,812us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	73,038us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Infrastructure [Member]
External sales:
Total sales	304,074us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	319,289us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	621,157us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	600,867us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Operating income:
Total operating (loss) income	(371,920)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	18,604us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	(352,699)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	40,294us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Corporate [Member]
Operating income:
Total operating (loss) income	$ (3,646)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ (2,106)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ (5,864)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ (4,787)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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