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Segment Data - Sales and Operating Income (Loss) by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Segment Reporting Information [Line Items]          
Assets $ 2,475,861   $ 2,475,861   $ 2,415,496
External sales:          
Total sales 571,345 $ 487,573 1,113,799 $ 964,713  
Operating income (loss):          
Total operating (income) loss (68,174) (24,013) (124,650) (14,802)  
Interest expense 7,231 7,151 14,379 14,144  
Other expense, net 1,313 726 1,401 844  
Income (loss) from continuing operations before income taxes 59,630 16,136 108,870 (186)  
Industrial [Member]          
External sales:          
Total sales 312,448 267,492 609,912 536,536  
Operating income (loss):          
Total operating (income) loss (43,292) (18,067) (78,104) (23,603)  
Infrastructure [Member]          
External sales:          
Total sales 211,153 177,207 410,900 344,289  
Operating income (loss):          
Total operating (income) loss (25,511) (10,274) (47,580) (2,687)  
WIDIA [Member]          
External sales:          
Total sales 47,744 42,874 92,987 83,888  
Operating income (loss):          
Total operating (income) loss (856) 2,666 (918) 8,403  
Corporate [Member]          
Operating income (loss):          
Total operating (income) loss $ 1,485 $ 1,662 $ 1,952 $ 3,085