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Goodwill and Other Intangible Assets - Carrying Amount of Goodwill Attributable to Each Segment (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Goodwill [Line Items]    
Goodwill and Intangible Asset Impairment $ 14,600  
Document Period End Date Dec. 31, 2019  
Goodwill [Roll Forward]    
Gross goodwill $ 1,083,013 $ 1,084,064
Accumulated impairment losses (797,187) (784,053)
Goodwill, Beginning Balance 300,011  
Change in gross goodwill due to translation (1,051)  
Impairment charges (13,134)  
Goodwill, Ending Balance 285,826  
Industrial [Member]    
Goodwill [Roll Forward]    
Gross goodwill 409,063 409,912
Accumulated impairment losses (137,204) (137,204)
Goodwill, Beginning Balance 272,708  
Change in gross goodwill due to translation (849)  
Impairment charges 0  
Goodwill, Ending Balance 271,859  
Infrastructure [Member]    
Goodwill [Roll Forward]    
Gross goodwill 633,211 633,211
Accumulated impairment losses (633,211) (633,211)
Goodwill, Beginning Balance 0  
Change in gross goodwill due to translation 0  
Impairment charges 0  
Goodwill, Ending Balance 0  
WIDIA [Member]    
Goodwill [Roll Forward]    
Gross goodwill 40,739 40,941
Accumulated impairment losses (26,772) $ (13,638)
Goodwill, Beginning Balance 27,303  
Change in gross goodwill due to translation (202)  
Impairment charges 13,134  
Goodwill, Ending Balance $ 13,967