Segment Data - Sales and Operating Income (Loss) by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Segment Reporting Information [Line Items]
Assets	$ 2,623,033		$ 2,623,033		$ 2,656,269
External sales:
Sales	505,080	$ 587,394	1,023,168	$ 1,174,080
Operating income (loss):
Total operating (loss) income	47,638	(78,858)	31,261	(162,010)
Interest expense	8,055	8,104	15,936	16,201
Other income, net	(4,211)	(4,022)	(6,891)	(6,782)
(Loss) income from continuing operations before income taxes	(51,482)	74,776	(40,306)	152,591
Industrial [Member]
External sales:
Sales	279,242	317,320	559,270	637,878
Operating income (loss):
Total operating (loss) income	19,259	(57,519)	(2,012)	(116,061)
Infrastructure [Member]
External sales:
Sales	181,501	221,120	375,504	438,576
Operating income (loss):
Total operating (loss) income	11,570	(20,614)	14,260	(44,474)
WIDIA [Member]
External sales:
Sales	44,337	48,954	88,394	97,626
Operating income (loss):
Total operating (loss) income	15,918	(1,728)	17,882	(3,822)
Corporate [Member]
Operating income (loss):
Total operating (loss) income	$ 891	$ 1,003	$ 1,131	$ 2,347