Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Goodwill	$ 300,003		$ 300,003		$ 301,802
Amortization expense for intangible assets	3,560	$ 3,677	7,141	$ 7,338
Infrastructure [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Goodwill	0		0		0
Industrial [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Goodwill	272,650		272,650		274,254
WIDIA [Member]
Goodwill and Other Intangible Assets (Additional Textual) [Abstract]
Goodwill	$ 27,353		$ 27,353		$ 27,548