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Stock-Based Compensation (Details 1) (USD $)	6 Months Ended
	Dec. 31, 2014
Changes in stock options
Options outstanding, June 30, 2014	2,264,824us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options, Granted	436,541us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Options, Exercised	(222,206)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Options, Lapsed and Forfeited	(11,905)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Options outstanding, December 31, 2014	2,467,254us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options vested and expected to vest, December 31, 2014	2,206,567us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Options exercisable, December 31, 2014	1,600,847us-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	$ 27.54us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Weighted Average Exercise Price, Lapsed and Forfeited	$ 41.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Weighted Average Exercise Price, Options outstanding, December 31, 2014	$ 35.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted Average Exercise Price, Option vested and expected to vest, December 31, 2014	$ 35.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
Weighted Average Exercise Price, Options exercisable, December 31, 2014	$ 32.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Weighted Average Remaining Life, Options outstanding, December 31, 2014	5 years 3 months
Weighted Average Remaining Life, Options vested and expected to vest, December 31, 2014	5 years 5 months
Weighted Average Remaining Life, Options exercisable, December 31, 2014	4 years 1 month
Aggregate Intrinsic value, Options outstanding, December 31, 2014	$ 7,580,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Aggregate Intrinsic Value, Options vested and expected to vest, December 31, 2014	7,578,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
Aggregate Intrinsic Value, Options exercisable, December 31, 2014	$ 7,562,000kmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableAggregateIntrinsicValue

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Share based payment award options exercisable aggregate intrinsic value.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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