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Segment Data - Sales and Operating Income (Loss) by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Segment Reporting Information [Line Items]          
Assets $ 2,617,862   $ 2,617,862   $ 2,415,496
External sales:          
Total sales 607,936 $ 528,630 1,721,734 $ 1,493,343  
Operating income (loss):          
Total operating (income) loss (85,356) (57,912) (210,005) (72,714)  
Interest expense 7,468 7,331 21,848 21,475  
Other expense, net 647 1,626 2,046 2,470  
Income from continuing operations before income taxes 77,241 48,955 186,111 48,769  
Industrial [Member]          
External sales:          
Total sales 333,012 289,455 942,922 825,990  
Operating income (loss):          
Total operating (income) loss (53,029) (38,535) (131,132) (62,138)  
Infrastructure [Member]          
External sales:          
Total sales 222,707 192,878 633,608 537,167  
Operating income (loss):          
Total operating (income) loss (31,767) (19,770) (79,347) (22,457)  
WIDIA [Member]          
External sales:          
Total sales 52,217 46,297 145,204 130,186  
Operating income (loss):          
Total operating (income) loss (1,638) (606) (2,556) 7,797  
Corporate [Member]          
Operating income (loss):          
Total operating (income) loss $ 1,078 $ 999 $ 3,030 $ 4,084