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Stock-Based Compensation - Changes in Restricted Stock Units (Details) (USD $) | 9 Months Ended
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Mar. 31, 2015
Restricted Stock Units - Performance Vesting [Member] |
Changes in restricted stock awards |
Unvested restricted stock awards, June 30, 2014, Shares | 197,356 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Granted, Shares | 88,536 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Vested, Shares | (28,022)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Performance Metric Not Achieved, Shares | (65,373)kmt_ShareBasedCompensationArrangementbyShareBasedpaymentAwardEquityInstrumentOtherThanOptionsExpirationsinPeriod / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Forfeited, Shares | (91,252)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Unvested restricted stock awards, March 31, 2015 | 101,245 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Weighted Average Fair Value, Unvested restricted stock awards, June 30, 2014 | $ 40.92 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Weighted Average Fair Value, Granted | $ 43.16 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Weighted Average Fair Value, Vested | $ 38.95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Weighted Average Fair Value, Performance Metric Not Achieved | $ 43.16 kmt_ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentOtherthanOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Weighted Average Fair Value, Forfeited | $ 42.96 kmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageFairValue / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Weighted Average Fair Value, Unvested restricted stock awards, March 31, 2015 | $ 43.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsPerformanceVestingMember
Restricted Stock Units - Time Vesting [Member] |
Changes in restricted stock awards |
Unvested restricted stock awards, June 30, 2014, Shares | 743,326 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember
Granted, Shares | 445,366 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember
Vested, Shares | (321,575)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember
Forfeited, Shares | (86,131)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember
Unvested restricted stock awards, March 31, 2015 | 780,986 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember
Weighted Average Fair Value, Unvested restricted stock awards, June 30, 2014 | $ 39.20 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember
Weighted Average Fair Value, Granted | $ 42.16 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember
Weighted Average Fair Value, Vested | $ 36.60 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember
Weighted Average Fair Value, Forfeited | $ 42.52 kmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageFairValue / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember
Weighted Average Fair Value, Unvested restricted stock awards, March 31, 2015 | $ 41.61 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmt_RestrictedStockUnitsTimeVestingMember

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- Definition Share Based Compensation Arrangement by Share Based payment Award Equity Instrument Other Than Options Expirations in Period + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share based Payment Award, Equity Instrument Other than Options, Expirations In Period, Weighted Average Exercise Price + References No definition available. + Details
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- Definition Share based payment award equity instruments other than options forfeited in period weighted average fair value. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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