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Segment Data - Sales and Operating Income (Loss) by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
Segment Reporting Information [Line Items]
Assets	$ 2,512,204		$ 2,925,737
External sales:
Sales (Note 3)	586,687	$ 542,454
Operating income (loss):
Total operating (income) loss	(83,152)	(52,171)
Interest expense	8,097	7,149
Other income, net	(2,761)	(4,218)
Income from continuing operations before income taxes	77,816	49,240
Industrial [Member]
External sales:
Sales (Note 3)	320,559	297,464
Operating income (loss):
Total operating (income) loss	(58,542)	(32,039)
Infrastructure [Member]
External sales:
Sales (Note 3)	217,456	199,747
Operating income (loss):
Total operating (income) loss	(23,860)	(20,390)
WIDIA [Member]
External sales:
Sales (Note 3)	48,672	45,243
Operating income (loss):
Total operating (income) loss	(2,093)	320
Corporate [Member]
Operating income (loss):
Total operating (income) loss	$ 1,343	$ (62)

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