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Accumulated Other Comprehensive (Loss) Income - Reclassifications (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]        
Loss on currency exchange contracts reclassified from accumulated other comprehensive loss into other (income) expense, net $ 378us-gaap_OtherNonoperatingIncomeExpense $ 561us-gaap_OtherNonoperatingIncomeExpense $ (32)us-gaap_OtherNonoperatingIncomeExpense $ (906)us-gaap_OtherNonoperatingIncomeExpense
Income tax (expense) benefit relating to reclassification out of accumulated other comprehensive loss (82,223)us-gaap_IncomeTaxExpenseBenefit 16,514us-gaap_IncomeTaxExpenseBenefit (23,975)us-gaap_IncomeTaxExpenseBenefit 45,750us-gaap_IncomeTaxExpenseBenefit
Reclassification out of Accumulated Other Comprehensive Loss[Member] | Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]        
Total before tax (1,148)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
1,063us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(612)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
2,432us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Income tax (expense) benefit relating to reclassification out of accumulated other comprehensive loss (443)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
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404us-gaap_IncomeTaxExpenseBenefit
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(236)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
924us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Net of tax (705)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
659us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(376)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
1,508us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Reclassification out of Accumulated Other Comprehensive Loss[Member] | Accumulated Defined Benefit Plans Adjustment [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]        
Reclassification out of accumulated other comprehensive loss, pension and other postretirement benefit plans, amortization of transition obligations 18us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
20us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
58us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
58us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Reclassification out of accumulated other comprehensive loss, Pension and Other Postretirement Benefit Plans, for amortization of prior service credit (100)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
(86)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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(296)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
(259)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Reclassification out of accumulated other comprehensive loss, Pension and Other Postretirement Benefit Plans, for actuarial losses 1,078us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
750us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
3,430us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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2,220us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Total before tax 996us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
684us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
3,192us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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2,019us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
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Income tax (expense) benefit relating to reclassification out of accumulated other comprehensive loss 311us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
189us-gaap_IncomeTaxExpenseBenefit
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= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
1,018us-gaap_IncomeTaxExpenseBenefit
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/ us-gaap_StatementEquityComponentsAxis
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542us-gaap_IncomeTaxExpenseBenefit
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Net of tax 685us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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495us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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2,174us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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1,477us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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Reclassification out of Accumulated Other Comprehensive Loss[Member] | Forward Starting Interest Rate Swap Contracts [Member] | Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]        
Loss on forward starting interest rate swap contracts reclassfied from accumulated other comprehensive loss to interest expense 505us-gaap_InterestIncomeExpenseNet
/ us-gaap_DerivativeInstrumentRiskAxis
= kmt_ForwardStartingInterestRateSwapContractsMember
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486us-gaap_InterestIncomeExpenseNet
/ us-gaap_DerivativeInstrumentRiskAxis
= kmt_ForwardStartingInterestRateSwapContractsMember
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= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
1,515us-gaap_InterestIncomeExpenseNet
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= kmt_ForwardStartingInterestRateSwapContractsMember
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1,459us-gaap_InterestIncomeExpenseNet
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= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Reclassification out of Accumulated Other Comprehensive Loss[Member] | Currency Forward Contracts [Member] | Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]        
Loss on currency exchange contracts reclassified from accumulated other comprehensive loss into other (income) expense, net $ (1,653)us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_DerivativeInstrumentRiskAxis
= kmt_CurrencyForwardContractsMember
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$ 577us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_DerivativeInstrumentRiskAxis
= kmt_CurrencyForwardContractsMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
$ (2,127)us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_DerivativeInstrumentRiskAxis
= kmt_CurrencyForwardContractsMember
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/ us-gaap_StatementEquityComponentsAxis
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$ 973us-gaap_OtherNonoperatingIncomeExpense
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