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Goodwill and Other Intangible Assets - Carrying Amount of Goodwill Attributable to Each Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2018
Goodwill [Roll Forward]
Goodwill	$ 1,084,897	$ 1,085,855
Accumulated impairment losses	(784,053)	(784,053)
Goodwill, Beginning Balance	301,802
Goodwill, Foreign Currency Translation Gain (Loss)	(958)
Goodwill, Ending Balance	300,844
Industrial [Member]
Goodwill [Roll Forward]
Goodwill	410,888	411,458
Accumulated impairment losses	(137,204)	(137,204)
Goodwill, Beginning Balance	274,254
Goodwill, Foreign Currency Translation Gain (Loss)	(570)
Goodwill, Ending Balance	273,684
Infrastructure [Member]
Goodwill [Roll Forward]
Goodwill	633,211	633,211
Accumulated impairment losses	(633,211)	(633,211)
Goodwill, Beginning Balance	0
Goodwill, Foreign Currency Translation Gain (Loss)	0
Goodwill, Ending Balance	0
WIDIA [Member]
Goodwill [Roll Forward]
Goodwill	40,798	41,186
Accumulated impairment losses	(13,638)	$ (13,638)
Goodwill, Beginning Balance	27,548
Goodwill, Foreign Currency Translation Gain (Loss)	(388)
Goodwill, Ending Balance	$ 27,160

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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