Restructuring and Related Charges and Asset Impairment Charges - Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Restructuring and Related Costs and Reserve [Line Items]
Restructuring reserve, current	$ 17,469	$ 27,294	$ 15,703
Restructuring Reserve [Abstract]
Beginning Balance	29,806
Expense	16,419	65,606	30,000
Asset Write-Down	(4,264)	(2,096)
Translation	1,094	356
Cash Expenditures	(25,416)	(49,763)
Ending Balance	17,639	29,806
Industrial [Member]
Restructuring Reserve [Abstract]
Beginning Balance	17,733	8,989
Expense	12,733	39,613
Asset Write-Down	(3,084)	(237)
Translation	869	221
Cash Expenditures	(20,284)	(30,853)
Ending Balance	7,967	17,733	8,989
Industrial [Member] | Severance [Member]
Restructuring Reserve [Abstract]
Beginning Balance	17,639	8,180
Expense	9,734	39,214
Asset Write-Down	0	0
Translation	868	229
Cash Expenditures	(20,274)	(29,984)
Ending Balance	7,967	17,639	8,180
Industrial [Member] | Facilities [Member]
Restructuring Reserve [Abstract]
Beginning Balance	0	0
Expense	3,084	237
Asset Write-Down	(3,084)	(237)
Translation	0	0
Cash Expenditures	0	0
Ending Balance	0	0	0
Industrial [Member] | Other [Member]
Restructuring Reserve [Abstract]
Beginning Balance	94	809
Expense	(85)	162
Asset Write-Down	0	0
Translation	1	(8)
Cash Expenditures	(10)	(869)
Ending Balance	0	94	809
WIDIA [Member]
Restructuring Reserve [Abstract]
Beginning Balance	2,434	999
Expense	1,218	6,361
Asset Write-Down	(747)	(10)
Translation	42	36
Cash Expenditures	(845)	(4,952)
Ending Balance	2,102	2,434	999
WIDIA [Member] | Severance [Member]
Restructuring Reserve [Abstract]
Beginning Balance	2,434	909
Expense	475	6,325
Asset Write-Down	0	0
Translation	42	37
Cash Expenditures	(864)	(4,837)
Ending Balance	2,087	2,434	909
WIDIA [Member] | Facilities [Member]
Restructuring Reserve [Abstract]
Beginning Balance	0	0
Expense	747	10
Asset Write-Down	(747)	(10)
Translation	0	0
Cash Expenditures	0	0
Ending Balance	0	0	0
WIDIA [Member] | Other [Member]
Restructuring Reserve [Abstract]
Beginning Balance	0	90
Expense	(4)	26
Asset Write-Down	0	0
Translation	0	(1)
Cash Expenditures	19	(115)
Ending Balance	15	0	90
Infrastructure [Member]
Restructuring Reserve [Abstract]
Beginning Balance	9,639	5,715
Expense	2,468	19,632
Asset Write-Down	(433)	(1,849)
Translation	183	99
Cash Expenditures	(4,287)	(13,958)
Ending Balance	7,570	9,639	5,715
Infrastructure [Member] | Severance [Member]
Restructuring Reserve [Abstract]
Beginning Balance	9,573	5,301
Expense	2,053	17,710
Asset Write-Down	0	0
Translation	183	103
Cash Expenditures	(4,251)	(13,541)
Ending Balance	7,558	9,573	5,301
Infrastructure [Member] | Facilities [Member]
Restructuring Reserve [Abstract]
Beginning Balance	21	33
Expense	433	1,849
Asset Write-Down	(433)	(1,849)
Translation	0	0
Cash Expenditures	(21)	(12)
Ending Balance	0	21	33
Infrastructure [Member] | Other [Member]
Restructuring Reserve [Abstract]
Beginning Balance	45	381
Expense	(18)	73
Asset Write-Down	0	0
Translation	0	(4)
Cash Expenditures	(15)	(405)
Ending Balance	$ 12	$ 45	$ 381