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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2023
Goodwill, Gross	$ 1,082,439	$ 1,093,598	$ 1,080,423
Goodwill, Accumulated Impairment Loss	810,872	810,872	810,872
Goodwill	271,567	282,726	269,551
Goodwill, Period Increase (Decrease)	(1,784)
Metal Cutting [Member]
Goodwill, Gross	449,228	460,387	447,212
Goodwill, Accumulated Impairment Loss	(177,661)	(177,661)	(177,661)
Goodwill	271,567	282,726	269,551
Goodwill, Period Increase (Decrease)	(1,784)
Infrastructure [Member]
Goodwill, Gross	633,211	633,211	633,211
Goodwill, Accumulated Impairment Loss	(633,211)	(633,211)	(633,211)
Goodwill	0	$ 0	$ 0
Goodwill, Period Increase (Decrease)	$ 0

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