Finite-Lived and Indefinite-lived Intangible Assets [Line Items]

No definition available.

Name:	kmt_FiniteLivedAndIndefiniteLivedIntangibleAssetsLineItems
Namespace Prefix:	kmt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Finite-lived Intangible Assets, Written off Related to Sale of Business Unit

+ References

No definition available.

+ Details

Name:	kmt_FinitelivedIntangibleAssetsWrittenoffRelatedtoSaleofBusinessUnit
Namespace Prefix:	kmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Goodwill and other intangible assets.

+ References

No definition available.

+ Details

Name:	kmt_GoodwillAndOtherIntangibleAssetsAdditionalTextualAbstract
Namespace Prefix:	kmt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Intangible Asset Write-Down - Balance sheet account

+ References

No definition available.

+ Details

Name:	kmt_IntangibleAssetWriteDown
Namespace Prefix:	kmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Net Book Value

+ References

No definition available.

+ Details

Name:	kmt_NetBookValue
Namespace Prefix:	kmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage point increase (decrease) of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

+ Details

Name:	kmt_Percentagepointincreasedecreaseoffairvalueofreportingunitinexcessofcarryingamount.
Namespace Prefix:	kmt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Reduction of Liability

+ References

No definition available.

+ Details

Name:	kmt_ReductionofLiability
Namespace Prefix:	kmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

+ References

No definition available.

+ Details

Name:	us-gaap_GoodwillAndIntangibleAssetImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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

- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

+ Details

Name:	us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

+ Details

Name:	us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of write-off of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit associated with the sale of all or a portion of a reporting unit.

+ References

No definition available.

+ Details

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

- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

+ Details

Name:	us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=kmt_InfrastructureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	kmt_InfrastructureTechnologyAssetAxis=kmt_InfrastructureTechnologyAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	kmt_PortfolioofBusinessesforStrategicAlternativesAxis=kmt_PortfolioofBusinessesforStrategicAlternativesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=kmt_IndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	kmt_ImpairmentAxis=kmt_DecemberChargesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_UnpatentedTechnologyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=kmt_TechnologyBasedAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ContractualRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	kmt_InfrastructureIndefiniteLivedTrademarkAssetAxis=kmt_InfrastructureIndefiniteLivedTrademarkAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Asset Impairment Charges		$ 376,500
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Goodwill, Impairment Loss		(375,000)	$ (105,711)
Goodwill	$ 297,975		297,975		$ 297,975	$ 417,389
Goodwill, Written off Related to Sale of Business Unit			7,536
Amortization expense for intangible assets	5,638	6,931	11,886	$ 13,959
Percentage point increase (decrease) of fair value of reporting unit in excess of carrying amount.					(20.00%)
Infrastructure [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Goodwill, Impairment Loss			(105,711)
Goodwill	0		0		$ 0	112,860
Goodwill, Written off Related to Sale of Business Unit			6,461
Infrastructure [Member] \| Infrastructure Technology Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Asset Write-Down		10,500
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Impairment of Intangible Assets (Excluding Goodwill)		5,500
Reduction of Liability		5,000
Infrastructure [Member] \| Portfolio of Businesses for Strategic Alternatives [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Net Book Value	40,000		40,000		40,000
Industrial [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Goodwill, Impairment Loss			0
Goodwill	$ 297,975		297,975		$ 297,975	$ 304,529
Goodwill, Written off Related to Sale of Business Unit			$ 1,075
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	70.00%		70.00%		70.00%
December Charges [Member] \| Infrastructure [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill and Intangible Asset Impairment	$ 106,100
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Goodwill, Impairment Loss	(105,700)
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	400
December Charges [Member] \| Industrial [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 2,300
Trademarks [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit			$ 5,000
Customer-related [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Finite-lived Intangible Assets, Written off Related to Sale of Business Unit			30,000
Unpatented Technology [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Finite-lived Intangible Assets, Written off Related to Sale of Business Unit			15,400
Trademarks [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Finite-lived Intangible Assets, Written off Related to Sale of Business Unit			1,100
Technology-Based and other [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Finite-lived Intangible Assets, Written off Related to Sale of Business Unit			800
Contractual Rights [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Finite-lived Intangible Assets, Written off Related to Sale of Business Unit			$ 500
Infrastructure Indefinite-Lived Trademark Asset [Member] \| Infrastructure [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Impairment of Intangible Assets (Excluding Goodwill)		$ 1,500