Restructuring and Related Charges and Asset Impairment Charges - Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Restructuring Reserve [Abstract]
Beginning Balance	$ 19,212	$ 17,639
Expense	69,174	19,542	$ 16,400
Asset Write-Down	(3,039)	(4,597)
Translation	(399)	(298)
Cash Expenditures	(37,582)	(13,074)
Ending Balance	47,366	19,212	17,639
Industrial [Member]
Restructuring Reserve [Abstract]
Beginning Balance	8,898	7,967
Expense	60,408	12,342
Asset Write-Down	(2,096)	(3,488)
Translation	(332)	(177)
Cash Expenditures	(30,765)	(7,746)
Ending Balance	36,113	8,898	7,967
Industrial [Member] | Severance [Member]
Restructuring Reserve [Abstract]
Beginning Balance	8,863	7,967
Expense	58,308	8,957
Asset Write-Down	0	0
Translation	(331)	(176)
Cash Expenditures	(30,742)	(7,885)
Ending Balance	36,098	8,863	7,967
Industrial [Member] | Facilities [Member]
Restructuring Reserve [Abstract]
Beginning Balance	0	0
Expense	2,096	3,488
Asset Write-Down	(2,096)	(3,488)
Translation	0	0
Cash Expenditures	0	0
Ending Balance	0	0	0
Industrial [Member] | Other [Member]
Restructuring Reserve [Abstract]
Beginning Balance	35	0
Expense	4	(103)
Asset Write-Down	0	0
Translation	(1)	(1)
Cash Expenditures	(23)	139
Ending Balance	15	35	0
WIDIA [Member]
Restructuring Reserve [Abstract]
Beginning Balance	2,330	2,102
Expense	2,678	2,561
Asset Write-Down	(51)	(401)
Translation	88	(43)
Cash Expenditures	(1,696)	(1,889)
Ending Balance	3,349	2,330	2,102
WIDIA [Member] | Severance [Member]
Restructuring Reserve [Abstract]
Beginning Balance	2,306	2,087
Expense	2,627	2,185
Asset Write-Down	0	0
Translation	88	(43)
Cash Expenditures	(1,696)	(1,923)
Ending Balance	3,325	2,306	2,087
WIDIA [Member] | Facilities [Member]
Restructuring Reserve [Abstract]
Beginning Balance	0	0
Expense	51	401
Asset Write-Down	(51)	(401)
Translation	0	0
Cash Expenditures	0	0
Ending Balance	0	0	0
WIDIA [Member] | Other [Member]
Restructuring Reserve [Abstract]
Beginning Balance	24	15
Expense	0	(25)
Asset Write-Down	0	0
Translation	0	0
Cash Expenditures	0	34
Ending Balance	24	24	15
Infrastructure [Member]
Restructuring Reserve [Abstract]
Beginning Balance	7,984	7,570
Expense	6,088	4,639
Asset Write-Down	(892)	(708)
Translation	(155)	(78)
Cash Expenditures	(5,121)	(3,439)
Ending Balance	7,904	7,984	7,570
Infrastructure [Member] | Severance [Member]
Restructuring Reserve [Abstract]
Beginning Balance	7,956	7,558
Expense	5,194	3,977
Asset Write-Down	0	0
Translation	(154)	(78)
Cash Expenditures	(5,116)	(3,501)
Ending Balance	7,880	7,956	7,558
Infrastructure [Member] | Facilities [Member]
Restructuring Reserve [Abstract]
Beginning Balance	0	0
Expense	892	708
Asset Write-Down	(892)	(708)
Translation	0	0
Cash Expenditures	0	0
Ending Balance	0	0	0
Infrastructure [Member] | Other [Member]
Restructuring Reserve [Abstract]
Beginning Balance	28	12
Expense	2	(46)
Asset Write-Down	0	0
Translation	(1)	0
Cash Expenditures	(5)	62
Ending Balance	$ 24	$ 28	$ 12