Goodwill and Other Intangible Assets Schedule of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Goodwill [Line Items]
Goodwill, Gross			$ 1,081,452	$ 1,084,064	$ 1,085,855
Goodwill, Accumulated Impairment Loss			(810,872)	(784,053)	(784,053)
Goodwill			270,580	300,011	301,802
Goodwill, Period Increase (Decrease)			(2,612)	(1,791)
Goodwill, Impairment Loss			(26,819)
Industrial [Member]
Goodwill [Line Items]
Goodwill, Gross			407,784	409,912	411,458
Goodwill, Accumulated Impairment Loss			137,204	137,204	137,204
Goodwill			270,580	272,708	274,254
Goodwill, Period Increase (Decrease)			(2,128)	(1,546)
Goodwill, Impairment Loss			0
WIDIA [Member]
Goodwill [Line Items]
Goodwill, Gross			40,457	40,941	41,186
Goodwill, Accumulated Impairment Loss			40,457	13,638	13,638
Goodwill			0	27,303	27,548
Goodwill, Period Increase (Decrease)			(484)	(245)
Goodwill, Impairment Loss	$ (13,700)	$ (13,100)	26,819
Infrastructure [Member]
Goodwill [Line Items]
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	$ 0
Goodwill, Impairment Loss			$ 0