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Stock-Based Compensation (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified | 6 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Stock-Based Compensation (Additional Textual) [Abstract] |  |
Maximum period of achievement of performance goals to earn performance units | 3 years |
Minimum performance period of individual required to earn performance units | 3 years |
Stock Option [Member] |  |
Stock-Based Compensation (Textual) [Abstract] |  |
Compensation expense related to stock option | $ 2.8us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 3.5us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Unrecognized compensation cost | 3.7us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
Unrecognized compensation costs, weighted average period | 2 years 10 months |
Weighted average fair value of options granted | $ 10.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 13.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Share Based Compensation Arrangement by Share Based Payment Award Options Vested in Period | 6.9kmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 5.0kmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Tax benefits resulting from stock-based compensation deductions in excess of amounts reported for financial reporting purposes | 1.3us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 4.5us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Cash received from the exercise of capital stock option | 6.1us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 12.7us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Tax benefit from the exercise of capital stock option | 1.3us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 2.7us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Total Intrinsic value of options exercised | 3.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 9.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Fair market value of shares delivered |  | 0.2us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Restricted Stock Units - Time Vesting Performance Vesting [Member] |  |
Stock-Based Compensation (Textual) [Abstract] |  |
Compensation expense related to stock option | 10.6us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember | 8.4us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember
Unrecognized compensation cost | $ 21.3us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember |
Unrecognized compensation costs, weighted average period | 2 years 8 months 10 days |

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- Definition Share based compensation arrangement by share based payment award options vested in period. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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