Segment Data - Sales and Operating Income (Loss) by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Segment Reporting Information [Line Items]
Assets	$ 2,334,739		$ 2,334,739		$ 2,362,783
External sales:
Total sales	528,630	$ 497,837	1,493,343	$ 1,577,212
Operating income (loss):
Total operating (income) loss	(57,912)	(27,335)	(72,714)	200,006
Interest expense	7,331	7,113	21,475	20,895
Other expense (income), net	1,626	(1,938)	2,470	(1,582)
Income (loss) from continuing operations before income taxes	48,955	22,160	48,769	(219,319)
Industrial [Member]
Segment Reporting Information [Line Items]
Assets	1,100,690		1,100,690		1,019,887
External sales:
Total sales	289,455	274,123	825,990	812,892
Operating income (loss):
Total operating (income) loss	(38,535)	(26,371)	(62,138)	(59,855)
Infrastructure [Member]
Segment Reporting Information [Line Items]
Assets	791,194		791,194		849,447
External sales:
Total sales	192,878	181,465	537,167	636,624
Operating income (loss):
Total operating (income) loss	(19,770)	(3,748)	(22,457)	242,417
WIDIA [Member]
Segment Reporting Information [Line Items]
Assets	191,453		191,453		195,339
External sales:
Total sales	46,297	42,249	130,186	127,696
Operating income (loss):
Total operating (income) loss	(606)	1,679	7,797	8,053
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	251,402		251,402		$ 298,110
Operating income (loss):
Total operating (income) loss	$ 999	$ 1,105	$ 4,084	$ 9,391