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Pension and Other Postretirement Benefits (Details 7)	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
U.S. Plans [Member]
Rates of Future Salary Increases [Abstract]
Rate of Future Salary Increase	4.00%	4.00%	4.00%
International Plans [Member]
Rates of Future Salary Increases [Abstract]
Rate of Future Salary Increase	1.50%	1.50%
Minimum [Member] | U.S. Plans [Member]
Discount Rate
Discount Rate	1.20%	1.60%	2.70%
Minimum [Member] | International Plans [Member]
Discount Rate
Discount Rate	0.30%	0.20%	0.40%
Rates of Future Salary Increases [Abstract]
Rate of Future Salary Increase	300.00%		1.80%
Maximum [Member] | U.S. Plans [Member]
Discount Rate
Discount Rate	3.00%	2.90%	3.60%
Maximum [Member] | International Plans [Member]
Discount Rate
Discount Rate	3.20%	2.40%	2.90%
Rates of Future Salary Increases [Abstract]
Rate of Future Salary Increase			3.00%

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- Definition

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=118255775&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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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