Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2022
Goodwill, Gross	$ 1,080,423	$ 1,082,439	$ 1,075,102
Goodwill, Accumulated Impairment Loss	810,872	810,872	810,872
Goodwill	269,551	271,567	264,230
Goodwill, Period Increase (Decrease)	5,321
Metal Cutting [Member]
Goodwill, Gross	447,212	449,228	441,891
Goodwill, Accumulated Impairment Loss	(177,661)	(177,661)	(177,661)
Goodwill	269,551	271,567	264,230
Goodwill, Period Increase (Decrease)	5,321
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