Segment Data - Sales and Operating Income (Loss) by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Segment Reporting Information [Line Items]
Assets	$ 2,254,781		$ 2,254,781		$ 2,362,783
External sales:
Total sales	487,573	$ 524,021	964,713	$ 1,079,376
Operating income (loss):
Total operating income (loss)	24,013	(233,956)	14,802	(227,343)
Interest expense	7,151	6,803	14,144	13,782
Other expense (income), net	726	(732)	844	353
Income (loss) from continuing operations before income taxes	16,136	(240,027)	(186)	(241,478)
Industrial [Member]
Segment Reporting Information [Line Items]
Assets	1,054,688		1,054,688		1,019,887
External sales:
Total sales	267,492	268,578	536,536	538,770
Operating income (loss):
Total operating income (loss)	18,067	12,025	23,603	33,483
Infrastructure [Member]
Segment Reporting Information [Line Items]
Assets	755,836		755,836		849,447
External sales:
Total sales	177,207	213,138	344,289	455,159
Operating income (loss):
Total operating income (loss)	10,274	(237,738)	2,687	(246,166)
WIDIA [Member]
Segment Reporting Information [Line Items]
Assets	193,343		193,343		195,339
External sales:
Total sales	42,874	42,305	83,888	85,447
Operating income (loss):
Total operating income (loss)	(2,666)	(4,665)	(8,403)	(6,374)
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	250,914		250,914		$ 298,110
Operating income (loss):
Total operating income (loss)	$ (1,662)	$ (3,578)	$ (3,085)	$ (8,286)