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Fair Value Measurments (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014
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

X
- Definition Contingent Consideration Paid + References No definition available. + Details
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Namespace Prefix: | kmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period Over which Contingent Consideration is Payable + References No definition available. + Details
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Namespace Prefix: | kmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |