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Business Segments - Narrative (Details) - segment
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Concentration Risk [Line Items]      
Number of reportable segments (segment)   2  
Customer Concentration Risk | Net Sales | Arconic      
Concentration Risk [Line Items]      
Concentration risk   10.00% 12.00%
Customer Concentration Risk | Net Sales | Precision Castparts Corporation      
Concentration Risk [Line Items]      
Concentration risk 10.00%    
Customer Concentration Risk | Accounts Receivable | Precision Castparts Corporation      
Concentration Risk [Line Items]      
Concentration risk   11.00%