Segment Data - Sales and Operating Income (Loss) by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Segment Reporting Information [Line Items]
Assets	$ 2,607,683		$ 2,607,683		$ 2,925,737
External sales:
Sales (Note 3)	597,204	$ 607,936	1,771,285	$ 1,721,734
Operating income (loss):
Total operating (income) loss	(81,871)	(80,833)	(243,881)	(196,645)
Interest expense	8,104	7,468	24,305	21,848
Other income, net	(4,993)	(3,876)	(11,775)	(11,314)
Income from continuing operations before income taxes	78,760	77,241	231,351	186,111
Industrial [Member]
External sales:
Sales (Note 3)	318,636	333,012	956,515	942,922
Operating income (loss):
Total operating (income) loss	(57,218)	(50,239)	(173,279)	(122,782)
Infrastructure [Member]
External sales:
Sales (Note 3)	227,602	222,707	666,178	633,608
Operating income (loss):
Total operating (income) loss	(24,934)	(30,097)	(69,407)	(74,320)
WIDIA [Member]
External sales:
Sales (Note 3)	50,966	52,217	148,592	145,204
Operating income (loss):
Total operating (income) loss	4	(1,260)	(3,817)	(1,414)
Corporate [Member]
Operating income (loss):
Total operating (income) loss	$ 277	$ 763	$ 2,622	$ 1,871