Stock-Based Compensation - Changes in Restricted Stock Units (Details)	3 Months Ended
	Sep. 30, 2025 $ / shares shares
Restricted Stock Units - Performance Vesting
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested restricted stock awards, beginning balance (in shares) \| shares	568,332
Granted (in shares) \| shares	365,215
Vested (in shares) \| shares	(221,398)
Performance metric adjustments, net (in shares) \| shares	(38,930)
Forfeited (in shares) \| shares	(4,805)
Unvested restricted stock awards, ending balance (in shares) \| shares	668,414
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Fair Value, Unvested restricted stock awards, beginning balance (in dollars per share) \| $ / shares	$ 24.76
Weighted Average Fair Value, Granted (in dollars per share) \| $ / shares	21.02
Weighted Average Fair Value, Vested (in dollars per share) \| $ / shares	27.27
Weighted Average Fair Value, Performance metric adjustments, net (in dollars per share) \| $ / shares	26.28
Weighted Average Fair Value, Forfeited (in dollars per share) \| $ / shares	23.09
Weighted Average Fair Value, Unvested restricted stock awards, ending balance (in dollars per share) \| $ / shares	$ 21.81
Restricted Stock Units - Time Vesting
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested restricted stock awards, beginning balance (in shares) \| shares	1,197,215
Granted (in shares) \| shares	831,312
Vested (in shares) \| shares	(541,871)
Performance metric adjustments, net (in shares) \| shares	0
Forfeited (in shares) \| shares	(16,274)
Unvested restricted stock awards, ending balance (in shares) \| shares	1,470,382
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Fair Value, Unvested restricted stock awards, beginning balance (in dollars per share) \| $ / shares	$ 25.50
Weighted Average Fair Value, Granted (in dollars per share) \| $ / shares	21.04
Weighted Average Fair Value, Vested (in dollars per share) \| $ / shares	25.87
Weighted Average Fair Value, Performance metric adjustments, net (in dollars per share) \| $ / shares	0
Weighted Average Fair Value, Forfeited (in dollars per share) \| $ / shares	23.56
Weighted Average Fair Value, Unvested restricted stock awards, ending balance (in dollars per share) \| $ / shares	$ 22.87

KENNAMETAL INC 10-Q