Income Taxes (Details Textual) (USD $)	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Income Taxes (Textuals) [Abstract]
U.S. Federal income taxes associated with dividends of international subsidiary current year income	$ 17,900,000
Tax benefit after IRS examination of 2005 and 2006 tax years			1,800,000
Valuation allowance adjustment	20,500,000		2,800,000
Unrealized tax benefits associated with net operating loss carryforwards for foreign and state jurisdiction	65,800,000
Unrealized tax benefits expiring through June 2016	9,300,000
Unrealized tax benefits expiring through 2021	6,800,000
Unrealized tax benefits expiring through 2026	4,300,000
Unrealized tax benefits expiring through 2031	6,900,000
Unrealized tax benefits that will not expire	38,500,000
Valuation allowance	(25,662,000)	(47,987,000)
valuation allowance related to deferred tax assets decreased	22,300,000
Reversal of valuation allowance due to change in judgment about the realizability of certain deferred tax assets	21,500,000
Unremitted earnings of non-U.S. subsidiaries and affiliates	1,084,500,000
Effective tax	18,000,000	15,800,000	15,200,000
Interest expense	900,000	400,000	800,000
Interest accrued	3,200,000	2,000,000
Reasonably possible amount of unrecognized tax benefits within the next twelve months as a result of the progression of various state and foreign audits in process, Lower Range	13,000,000
Reasonably possible amount of unrecognized tax benefits within the next twelve months as a result of the progression of various state and foreign audits in process, Upper Range	$ 14,000,000

Domestic income taxes associated with dividends of international subsidiary current year income.

Name:	kmt_DomesticIncomeTaxesAssociatedWithDividendsOfInternationalSubsidiaryCurrentYearIncome
Namespace Prefix:	kmt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Income taxes.

+ Details

Name:	kmt_IncomeTaxesTextualsAbstract
Namespace Prefix:	kmt
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Income tax reconciliation other valuation allowance adjustments.

+ Details

Name:	kmt_IncomeTaxReconciliationOtherValuationAllowanceAdjustments
Namespace Prefix:	kmt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reversal of valuation allowance due to change in judgment about the realizability of certain deferred tax assets.

+ Details

Name:	kmt_ReversalOfValuationAllowanceDueToChangeInJudgmentAboutRealizabilityOfCertainDeferredTaxAssets
Namespace Prefix:	kmt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The estimated lower bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

+ Details

Name:	kmt_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound
Namespace Prefix:	kmt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The estimated upper bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

+ Details

Name:	kmt_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound
Namespace Prefix:	kmt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward, Expiring Year Fifteen Through Twenty.

+ Details

Name:	kmt_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforwardExpiringYearFifteenThroughTwenty
Namespace Prefix:	kmt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward, Expiring Year Five Through Ten.

+ Details

Name:	kmt_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforwardExpiringYearFiveThroughTen
Namespace Prefix:	kmt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward, Expiring Year One Through Five.

+ Details

Name:	kmt_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforwardExpiringYearOneThroughFive
Namespace Prefix:	kmt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward, Expiring Year Ten Through Fifteen.

+ Details

Name:	kmt_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforwardExpiringYearTenThroughFifteen
Namespace Prefix:	kmt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward That Do Not Expire.

+ Details

Name:	kmt_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforwardThatDoNotExpire
Namespace Prefix:	kmt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

unremitted earnings of Foreign subsidiaries and affiliates.

+ Details

Name:	kmt_UnremittedEarningsOfForeignSubsidiariesAndAffiliates
Namespace Prefix:	kmt
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 17
-Subparagraph e

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43-49

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 26

+ Details

Name:	us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 10A, 10B, 10C

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 10
-Subparagraph b

+ Details

Name:	us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph c

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 15

+ Details

Name:	us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

+ References

+ Details

Name:	us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of an unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward. This amount should be presented as a reduction of the related deferred tax asset in the balance sheet if that deferred tax asset has not been used. This amount is presented separately from the deferred tax asset for a net operating loss carryforward if this unrelated tax benefit is associated with a different tax position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 17, 18

+ Details

Name:	us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph b

+ Details

Name:	us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant