Supplemental Cash Flow Disclosures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Sep. 30, 2014	Sep. 30, 2013
Cash paid during the period for:
Interest	$ 9,002	$ 7,020
Income taxes	10,791	7,260
Change in accounts payable related to property, plant, and equipment	$ 6,470	$ 8,600

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

Change in accounts payable related to purchases of property plant and equipment

+ References

No definition available.

+ Details

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

- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

+ Details

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

- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

+ References

+ Details

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