Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	6 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Cash paid during the period for:
Interest	$ 13,480	$ 13,076
Income taxes	10,191	25,735
Change in accounts payable related to property, plant, and equipment	$ 15,404	$ 16,400

Cash paid during the period for.

No definition available.

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

- Definition

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