Business Segments - Narrative (Details) - segment	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Concentration Risk [Line Items]
Number of reportable segments			2
Customer Concentration Risk | Net Sales | Precision Castparts Corporation
Concentration Risk [Line Items]
Concentration risk	10.00%
Customer Concentration Risk | Net Sales | Alcoa
Concentration Risk [Line Items]
Concentration risk		11.00%		13.00%
Customer Concentration Risk | Net Sales | Arconic
Concentration Risk [Line Items]
Concentration risk			12.00%
Customer Concentration Risk | Accounts Receivable | Precision Castparts Corporation
Concentration Risk [Line Items]
Concentration risk			10.00%
Customer Concentration Risk | Accounts Receivable | Alcoa, Inc. and Precision Castparts Corporation
Concentration Risk [Line Items]
Concentration risk					22.00%