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Stock-Based Compensation - Changes in Stock Options (Details) (USD $)
 9 Months Ended
Mar. 31, 2015
Changes in stock options  
Options outstanding, June 30, 2014 2,264,824us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options, Granted 436,541us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Options, Exercised (308,844)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Options, Lapsed and Forfeited (92,835)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Options outstanding, March 31, 2015 2,299,686us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options vested and expected to vest, March 31, 2015 2,256,996us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Options exercisable, March 31, 2015 1,755,765us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Weighted Average Exercise Price, Options outstanding, June 30, 2014 $ 33.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted Average Exercise Price, Granted $ 40.81kmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedWeightedAverageExercisePrice
Weighted Average Exercise Price, Exercised $ 26.96us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Weighted Average Exercise Price, Lapsed and Forfeited $ 41.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Weighted Average Exercise Price, Options outstanding, March 31, 2015 $ 35.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted Average Exercise Price, Option vested and expected to vest, March 31, 2015 $ 35.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
Weighted Average Exercise Price, Options exercisable, March 31, 2015 $ 34.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Weighted Average Remaining Life, Options outstanding, March 31, 2015 4 years 7 months
Weighted Average Remaining Life, Options vested and expected to vest, March 31, 2015 4 years 6 months
Weighted Average Remaining Life, Options exercisable, March 31, 2015 3 years 4 months
Aggregate Intrinsic value, Options outstanding, March 31, 2015 $ 5,142,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Aggregate Intrinsic Value, Options vested and expected to vest, March 31, 2015 5,142,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
Aggregate Intrinsic Value, Options exercisable, March 31, 2015 $ 5,142,000kmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableAggregateIntrinsicValue