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Pension and Other Postretirement Benefits (Details 7)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
U.S. Plans [Member]
Rates of Future Salary Increases [Abstract]
Rate of Future Salary Increase	4.00%	4.00%
Minimum [Member] | U.S. Plans [Member]
Discount Rate
Discount Rate	4.00%	3.30%	2.40%
Rates of Future Salary Increases [Abstract]
Rate of Future Salary Increase			3.00%
Minimum [Member] | International Plans [Member]
Discount Rate
Discount Rate	1.80%	2.00%	0.90%
Rates of Future Salary Increases [Abstract]
Rate of Future Salary Increase	2.50%	2.50%	2.50%
Maximum [Member] | U.S. Plans [Member]
Discount Rate
Discount Rate	4.30%	3.90%	3.70%
Rates of Future Salary Increases [Abstract]
Rate of Future Salary Increase			4.00%
Maximum [Member] | International Plans [Member]
Discount Rate
Discount Rate	3.30%	3.30%	3.20%
Rates of Future Salary Increases [Abstract]
Rate of Future Salary Increase	3.00%	3.00%	3.00%

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kmt_DiscountRate [Abstract]

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- Definition

Rates of future salary increases.

+ References

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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