Summary Of Significant Accounting Policies - Property, Plant and Equipment (Details) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2025 USD ($) Segment shares	Jun. 30, 2024 USD ($) shares	Jun. 30, 2023 USD ($) shares
Property, Plant and Equipment [Line Items]
Amortization	$ 10,787	$ 11,557	$ 12,624
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	10,600
Finite-Lived Intangible Assets, Amortization Expense, Year Two	9,100
Finite-Lived Intangible Assets, Amortization Expense, Year Three	8,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	7,900
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 7,900
Increase in weighted average shares due to dilutive effect of unexercised capital stock options, unvested restricted stock awards and unvested restricted stock units \| shares	630	575	599
Unexercised capital stock options, restricted stock units and restricted stock awards excluded from computation of diluted EPS \| shares	274	396	642
Termination of Warranty \| Segment	30
Research and Development Expense	$ 44,400	$ 44,200	$ 43,100
Currency Transaction Gain (Loss), before Tax	$ (1,300)	$ (4,100)	$ (3,900)
Minimum [Member] \| Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Minimum [Member] \| Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	4 years
Minimum [Member] \| Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Minimum [Member] \| ComputerHardwareAndSoftware [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] \| Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Maximum [Member] \| Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Maximum [Member] \| Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Maximum [Member] \| ComputerHardwareAndSoftware [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years

KENNAMETAL INC 10-K