Goodwill and Other Intangible Assets - Carrying Amount of Goodwill Attributable to Each Segment (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Goodwill [Line Items]
Goodwill and Intangible Asset Impairment		$ 14,600
Goodwill [Roll Forward]
Gross goodwill	$ 1,092,319		$ 1,081,452
Accumulated impairment losses	(810,872)		(810,872)
Goodwill, Beginning Balance	270,580
Change in gross goodwill due to translation	10,867
Goodwill, Ending Balance	281,447
Infrastructure [Member]
Goodwill [Roll Forward]
Gross goodwill	633,211		633,211
Accumulated impairment losses	(633,211)		(633,211)
Goodwill, Beginning Balance	0
Change in gross goodwill due to translation	0
Goodwill, Ending Balance	0
Metal Cutting
Goodwill [Roll Forward]
Gross goodwill	459,108		448,241
Accumulated impairment losses	(177,661)		$ (177,661)
Goodwill, Beginning Balance	270,580
Change in gross goodwill due to translation	10,867
Goodwill, Ending Balance	$ 281,447
WIDIA [Member]
Goodwill [Roll Forward]
Impairment charges		13,100
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		$ 1,500