Goodwill and Other Intangible Assets - Carrying Amount of Goodwill Attributable to Each Segment (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Goodwill [Roll Forward]
Goodwill	$ 1,076,005		$ 1,082,540
Accumulated impairment losses	(784,053)		(784,053)
Goodwill, Beginning Balance	298,487
Change in goodwill	(6,535)
Goodwill, Ending Balance	291,952
Industrial [Member]
Goodwill [Roll Forward]
Goodwill	402,156		408,705
Accumulated impairment losses	(137,204)		(137,204)
Goodwill, Beginning Balance	271,501
Change in goodwill	(6,549)
Goodwill, Written off Related to Sale of Business Unit		$ (1,100)
Goodwill, Ending Balance	264,952
Infrastructure [Member]
Goodwill [Roll Forward]
Goodwill	633,211		633,211
Accumulated impairment losses	(633,211)		(633,211)
Goodwill, Beginning Balance	0
Change in goodwill	0
Goodwill, Written off Related to Sale of Business Unit		$ (6,500)
Goodwill, Ending Balance	0
WIDIA [Member]
Goodwill [Roll Forward]
Goodwill	40,638		40,624
Accumulated impairment losses	(13,638)		$ (13,638)
Goodwill, Beginning Balance	26,986
Change in goodwill	14
Goodwill, Ending Balance	$ 27,000