Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2024	Mar. 31, 2024	Jun. 30, 2023
The components of intangible assets
Accumulated amortization	$ (181,798)	$ (181,798)	$ (173,346)
Intangible Assets, Gross (Excluding Goodwill)	$ 266,204	$ 266,204	266,510
Metal Cutting
The components of intangible assets
Business Combination, Reason for Business Combination	$3.6 million	$6.5 million.
Trademarks [Member]
The components of intangible assets
Gross carrying amount, Indefinite	$ 0	$ 0	10,836
Technology-based and other [Member]
The components of intangible assets
Gross carrying amount, finite	31,781	31,781	31,872
Accumulated amortization	(24,354)	(24,354)	(23,838)
Customer-related [Member]
The components of intangible assets
Gross carrying amount, finite	179,759	179,759	179,889
Accumulated amortization	(118,446)	(118,446)	(112,890)
Unpatented technology [Member]
The components of intangible assets
Gross carrying amount, finite	31,504	31,504	31,487
Accumulated amortization	(26,718)	(26,718)	(25,177)
Trademarks [Member]
The components of intangible assets
Gross carrying amount, finite	23,160	23,160	12,426
Accumulated amortization	$ (12,280)	$ (12,280)	$ (11,441)
Minimum [Member] \| Technology-based and other [Member]
The components of intangible assets
Useful life related to technology-based intangible assets	4 years	4 years
Minimum [Member] \| Customer-related [Member]
The components of intangible assets
Useful life related to technology-based intangible assets	10 years	10 years
Minimum [Member] \| Unpatented technology [Member]
The components of intangible assets
Useful life related to technology-based intangible assets	10 years	10 years
Minimum [Member] \| Trademarks [Member]
The components of intangible assets
Useful life related to technology-based intangible assets	5 years	5 years
Maximum [Member] \| Technology-based and other [Member]
The components of intangible assets
Useful life related to technology-based intangible assets	20 years	20 years
Maximum [Member] \| Customer-related [Member]
The components of intangible assets
Useful life related to technology-based intangible assets	21 years	21 years
Maximum [Member] \| Unpatented technology [Member]
The components of intangible assets
Useful life related to technology-based intangible assets	30 years	30 years
Maximum [Member] \| Trademarks [Member]
The components of intangible assets
Useful life related to technology-based intangible assets	20 years	20 years

KENNAMETAL INC 10-Q