Restructuring and Related Charges and Asset Impairment Charges - Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Restructuring Reserve [Abstract]
Beginning Balance	$ 17,639	$ 29,806
Expense	19,542	16,419	$ 65,600
Asset Write-Down	(4,597)	(4,264)
Translation	(298)	1,094
Cash Expenditures	(13,074)	(25,416)
Ending Balance	19,212	17,639	29,806
Industrial [Member]
Restructuring Reserve [Abstract]
Beginning Balance	7,967	17,733
Expense	12,342	12,733
Asset Write-Down	(3,488)	(3,084)
Translation	(177)	869
Cash Expenditures	(7,746)	(20,284)
Ending Balance	8,898	7,967	17,733
Industrial [Member] | Severance [Member]
Restructuring Reserve [Abstract]
Beginning Balance	7,967	17,639
Expense	8,957	9,734
Asset Write-Down	0	0
Translation	(176)	868
Cash Expenditures	(7,885)	(20,274)
Ending Balance	8,863	7,967	17,639
Industrial [Member] | Facilities [Member]
Restructuring Reserve [Abstract]
Beginning Balance	0	0
Expense	3,488	3,084
Asset Write-Down	(3,488)	(3,084)
Translation	0	0
Cash Expenditures	0	0
Ending Balance	0	0	0
Industrial [Member] | Other [Member]
Restructuring Reserve [Abstract]
Beginning Balance	0	94
Expense	(103)	(85)
Asset Write-Down	0	0
Translation	(1)	1
Cash Expenditures	139	(10)
Ending Balance	35	0	94
WIDIA [Member]
Restructuring Reserve [Abstract]
Beginning Balance	2,102	2,434
Expense	2,561	1,218
Asset Write-Down	(401)	(747)
Translation	(43)	42
Cash Expenditures	(1,889)	(845)
Ending Balance	2,330	2,102	2,434
WIDIA [Member] | Severance [Member]
Restructuring Reserve [Abstract]
Beginning Balance	2,087	2,434
Expense	2,185	475
Asset Write-Down	0	0
Translation	(43)	42
Cash Expenditures	(1,923)	(864)
Ending Balance	2,306	2,087	2,434
WIDIA [Member] | Facilities [Member]
Restructuring Reserve [Abstract]
Beginning Balance	0	0
Expense	401	747
Asset Write-Down	(401)	(747)
Translation	0	0
Cash Expenditures	0	0
Ending Balance	0	0	0
WIDIA [Member] | Other [Member]
Restructuring Reserve [Abstract]
Beginning Balance	15	0
Expense	(25)	(4)
Asset Write-Down	0	0
Translation	0	0
Cash Expenditures	34	19
Ending Balance	24	15	0
Infrastructure [Member]
Restructuring Reserve [Abstract]
Beginning Balance	7,570	9,639
Expense	4,639	2,468
Asset Write-Down	(708)	(433)
Translation	(78)	183
Cash Expenditures	(3,439)	(4,287)
Ending Balance	7,984	7,570	9,639
Infrastructure [Member] | Severance [Member]
Restructuring Reserve [Abstract]
Beginning Balance	7,558	9,573
Expense	3,977	2,053
Asset Write-Down	0	0
Translation	(78)	183
Cash Expenditures	(3,501)	(4,251)
Ending Balance	7,956	7,558	9,573
Infrastructure [Member] | Facilities [Member]
Restructuring Reserve [Abstract]
Beginning Balance	0	21
Expense	708	433
Asset Write-Down	(708)	(433)
Translation	0	0
Cash Expenditures	0	(21)
Ending Balance	0	0	21
Infrastructure [Member] | Other [Member]
Restructuring Reserve [Abstract]
Beginning Balance	12	45
Expense	(46)	(18)
Asset Write-Down	0	0
Translation	0	0
Cash Expenditures	62	(15)
Ending Balance	$ 28	$ 12	$ 45