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Long -Term Debt (Details Textual) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Jun. 30, 2014 | Oct. 21, 2011
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Long-Term Debt (Additional Textual) [Abstract] |  |  |
Fixed rate at fair market value | $ 703.3us-gaap_LongTermDebtFairValue | $ 705.3us-gaap_LongTermDebtFairValue |
2011 Credit Agreement [Member] |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |
Borrowing outstanding under 2011 Credit Agreement | 174.1us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kmt_TwentyElevenCreditAgreementMember | 287.1us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kmt_TwentyElevenCreditAgreementMember |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 600us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = kmt_TwentyElevenCreditAgreementMember

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- Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + Details
Name: | us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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