Segment Data - Sales and Operating Income (Loss) by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Segment Reporting Information [Line Items]
Assets	$ 2,538,100		$ 2,538,100		$ 2,656,269
External sales:
Sales	483,084	$ 597,204	1,506,252	$ 1,771,285
Operating income (loss):
Total operating income	(37,893)	(81,871)	(6,631)	(243,881)
Interest expense	7,897	8,104	23,834	24,305
Other income, net	(2,438)	(4,993)	(9,330)	(11,775)
Income (loss) from continuing operations before income taxes	32,434	78,760	(7,873)	231,351
Industrial [Member]
External sales:
Sales	260,738	318,636	820,008	956,515
Operating income (loss):
Total operating income	30,147	57,218	32,159	173,279
Infrastructure [Member]
External sales:
Sales	179,625	227,602	555,129	666,178
Operating income (loss):
Total operating income	21,941	24,934	7,679	69,407
WIDIA [Member]
External sales:
Sales	42,721	50,966	131,115	148,592
Operating income (loss):
Total operating income	(13,528)	(4)	(31,410)	3,817
Corporate [Member]
Operating income (loss):
Total operating income	$ (667)	$ (277)	$ (1,797)	$ (2,622)