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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, 2018
Jun. 30, 2018
Goodwill [Roll Forward]    
Goodwill $ 1,084,056 $ 1,085,855
Accumulated impairment losses (784,053) (784,053)
Goodwill, Beginning Balance 301,802  
Goodwill, Foreign Currency Translation Gain (Loss) (1,799)  
Goodwill, Ending Balance 300,003  
Industrial [Member]    
Goodwill [Roll Forward]    
Goodwill 409,854 411,458
Accumulated impairment losses (137,204) (137,204)
Goodwill, Beginning Balance 274,254  
Goodwill, Foreign Currency Translation Gain (Loss) (1,604)  
Goodwill, Ending Balance 272,650  
Infrastructure [Member]    
Goodwill [Roll Forward]    
Goodwill 633,211 633,211
Accumulated impairment losses (633,211) (633,211)
Goodwill, Beginning Balance 0  
Goodwill, Foreign Currency Translation Gain (Loss) 0  
Goodwill, Ending Balance 0  
WIDIA [Member]    
Goodwill [Roll Forward]    
Goodwill 40,991 41,186
Accumulated impairment losses (13,638) $ (13,638)
Goodwill, Beginning Balance 27,548  
Goodwill, Foreign Currency Translation Gain (Loss) (195)  
Goodwill, Ending Balance $ 27,353