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Derivative Instruments and Hedging Activities (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
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Feb. 28, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Feb. 14, 2012
Derivative Instruments and Hedging Activities (Textual) [Abstract] |  |  |  |  |  |  |
Recognize loss on outstanding derivatives in the next 12 months |  | $ 2,300,000us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months |  | $ 2,300,000us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months |  |  |
Gains or losses recognized in earnings due to ineffectiveness and excluded from effectiveness testing |  | 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet | 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet |  |  |  |
Derivative, Gain (Loss) on Derivative, Net [Abstract] |  |  |  |  |  |  |
Payments for derivative hedging instrument upon settlement | 22,400,000kmt_PaymentsForDerivativeHedgingInstrumentUponSettlement |  |  |  |  |  |
Contracts translated to US dollars [Member] |  |  |  |  |  |  |
Additional Derivative Instruments and Hedging Activities (Textual) [Abstract] |  |  |  |  |  |  |
Notional amount of the contracts translated into U.S. dollars |  | 57,000,000us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = kmt_ContractsTranslatedToUSDollarsMember |  | 57,000,000us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = kmt_ContractsTranslatedToUSDollarsMember |  | 91,100,000us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = kmt_ContractsTranslatedToUSDollarsMember |
Forward Starting Interest Rate Swap Contracts [Member] |  |  |  |  |  |  |
Additional Derivative Instruments and Hedging Activities (Textual) [Abstract] |  |  |  |  |  |  |
Notional amount of the contracts translated into U.S. dollars |  |  |  |  |  |  | 150,000,000us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = kmt_ForwardStartingInterestRateSwapContractsMember
Derivative, Loss on Derivative |  | $ 505,000us-gaap_DerivativeLossOnDerivative / us-gaap_DerivativeInstrumentRiskAxis = kmt_ForwardStartingInterestRateSwapContractsMember | $ 500,000us-gaap_DerivativeLossOnDerivative / us-gaap_DerivativeInstrumentRiskAxis = kmt_ForwardStartingInterestRateSwapContractsMember | $ 1,010,000us-gaap_DerivativeLossOnDerivative / us-gaap_DerivativeInstrumentRiskAxis = kmt_ForwardStartingInterestRateSwapContractsMember | $ 1,000,000us-gaap_DerivativeLossOnDerivative / us-gaap_DerivativeInstrumentRiskAxis = kmt_ForwardStartingInterestRateSwapContractsMember |  |

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- Definition Payments for derivative hedging instrument upon settlement. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Amount of decrease in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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