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Restructuring and Related Charges and Asset Impairment Charges - Restructuring Accrual (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restructuring Reserve [Abstract]
Beginning Balance	$ 9,002us-gaap_RestructuringReserve	$ 0us-gaap_RestructuringReserve
Restructuring Charges	24,389us-gaap_RestructuringCharges	5,013us-gaap_RestructuringCharges
Asset Write-Down	(1,783)us-gaap_RestructuringReserveAccrualAdjustment	0us-gaap_RestructuringReserveAccrualAdjustment
Other		0kmt_ReclassofSpecialTerminationBenefitCharges
Translation	(766)us-gaap_RestructuringReserveTranslationAdjustment	11us-gaap_RestructuringReserveTranslationAdjustment
Cash Expenditures	(14,932)us-gaap_PaymentsForRestructuring	(2,044)us-gaap_PaymentsForRestructuring
Ending Balance	15,451us-gaap_RestructuringReserve	2,980us-gaap_RestructuringReserve
Industrial [Member]
Restructuring Reserve [Abstract]
Beginning Balance	6,326us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	0us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Restructuring Charges	12,909us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	2,636us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Asset Write-Down	(1,261)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	0us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Other		0kmt_ReclassofSpecialTerminationBenefitCharges / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Translation	(397)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	6us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Cash Expenditures	(7,873)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	(1,075)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Ending Balance	9,704us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	1,567us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Industrial [Member] | Severance [Member]
Restructuring Reserve [Abstract]
Ending Balance	9,704us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	1,163us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Industrial [Member] | Facilities [Member]
Restructuring Reserve [Abstract]
Ending Balance	0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	328us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Industrial [Member] | Other [Member]
Restructuring Reserve [Abstract]
Ending Balance	0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember	76us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = kmt_IndustrialMember
Infrastructure [Member]
Restructuring Reserve [Abstract]
Beginning Balance	2,676us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	0us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Restructuring Charges	11,480us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	2,377us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Asset Write-Down	(522)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	0us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Other		0kmt_ReclassofSpecialTerminationBenefitCharges / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Translation	(369)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	5us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Cash Expenditures	(7,059)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	(969)us-gaap_PaymentsForRestructuring / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Ending Balance	5,747us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	1,413us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Infrastructure [Member] | Severance [Member]
Restructuring Reserve [Abstract]
Ending Balance	5,713us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	1,049us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Infrastructure [Member] | Facilities [Member]
Restructuring Reserve [Abstract]
Ending Balance	34us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	296us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember
Infrastructure [Member] | Other [Member]
Restructuring Reserve [Abstract]
Ending Balance	$ 0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember	$ 68us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = kmt_InfrastructureMember

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- Definition

Reclass of Special Termination Benefit Charges

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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Amount of foreign currency translation adjustment increasing or decreasing the accrual for a specified type of restructuring cost.

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