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Fair Value Measurments - Contingent Consideration (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2015	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent Consideration Paid	$ 4,000kmt_ContingentConsiderationPaid
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Period Over which Contingent Consideration is Payable	2 years
Emura [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, Fair Value Adjustment		$ 0us-gaap_LiabilitiesFairValueAdjustment / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = kmt_EmuraMember

X

- Definition

Contingent Consideration Paid

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Period Over which Contingent Consideration is Payable

+ References

No definition available.

+ Details

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- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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X

- Details

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