Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	$ 934,895				$ 824,213				$ 934,895	$ 824,213	$ 744,388
Revenues	603,949	$ 597,204	$ 587,394	$ 586,687	646,119	$ 607,936	$ 571,345	$ 542,454	2,375,234	2,367,853	2,058,368
Total operating income									328,850	290,299	94,752
Interest expense									32,994	30,081	28,842
Other income, net									(15,379)	(14,823)	(15,965)
Income before income taxes									311,235	275,041	81,875
Depreciation and Amortization									112,052	108,680	107,656
Assets	2,656,269				2,925,737				2,656,269	2,925,737	2,415,496
Capital Expenditures									212,343	171,004	118,018
Assets held for sale (Note 15)											7,000
Industrial [Member]
Segment Reporting Information [Line Items]
Revenues									1,274,499	1,292,098	1,126,309
Total operating income									220,696	176,978	73,053
Depreciation and Amortization									58,373	57,261	54,269
Assets	1,245,624				1,169,610				1,245,624	1,169,610	1,103,686
Capital Expenditures									145,485	112,124	70,281
WIDIA [Member]
Segment Reporting Information [Line Items]
Revenues									197,522	198,568	177,662
Total operating income									2,882	2,919	(6,800)
Depreciation and Amortization									9,390	9,483	10,728
Assets	216,633				193,971				216,633	193,971	191,626
Capital Expenditures									22,162	17,445	17,853
Infrastructure [Member]
Segment Reporting Information [Line Items]
Revenues									903,213	877,187	754,397
Total operating income									108,480	112,998	28,063
Depreciation and Amortization									44,284	41,916	42,596
Assets	883,566				864,402				883,566	864,402	813,747
Capital Expenditures									44,696	41,435	29,884
Corporate [Member]
Segment Reporting Information [Line Items]
Total operating income									(3,208)	(2,596)	436
Depreciation and Amortization									5	20	63
Assets	$ 310,446				$ 697,754				$ 310,446	$ 697,754	$ 306,437