Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	$ 1,038,271				$ 934,895				$ 1,038,271	$ 934,895	$ 824,200
Sales	379,053	$ 483,084	$ 505,080	$ 518,088	603,949	$ 597,204	$ 587,394	$ 586,687	1,885,305	2,375,234	2,367,853
Total operating income									22,252	328,850	290,299
Interest expense									35,154	32,994	30,081
Other income, net									(14,862)	(15,379)	(14,823)
Income before income taxes									1,960	311,235	275,041
Depreciation and Amortization									119,860	112,052	108,680
Assets	3,037,591				2,656,269				3,037,591	2,656,269	2,925,737
Capital Expenditures									244,151	212,343	171,004
Industrial [Member]
Segment Reporting Information [Line Items]
Sales									1,015,058	1,274,499	1,292,098
Total operating income									35,671	220,696	176,978
Depreciation and Amortization									64,366	58,373	57,261
Assets	1,291,879				1,245,624				1,291,879	1,245,624	1,169,610
Capital Expenditures									182,292	145,485	112,124
WIDIA [Member]
Segment Reporting Information [Line Items]
Sales									162,995	197,522	198,568
Total operating income									(34,686)	2,882	2,919
Depreciation and Amortization									10,298	9,390	9,483
Assets	160,252				216,633				160,252	216,633	193,971
Capital Expenditures									12,875	22,162	17,445
Infrastructure [Member]
Segment Reporting Information [Line Items]
Sales									707,252	903,213	877,187
Total operating income									23,113	108,480	112,998
Depreciation and Amortization									45,176	44,284	41,916
Assets	748,424				883,566				748,424	883,566	864,402
Capital Expenditures									48,984	44,696	41,435
Corporate [Member]
Segment Reporting Information [Line Items]
Total operating income									(1,846)	(3,208)	(2,596)
Depreciation and Amortization									20	5	20
Assets	$ 837,036				$ 310,446				$ 837,036	$ 310,446	$ 697,754