Business Segments - Narrative (Details)	3 Months Ended		12 Months Ended
	Sep. 30, 2015 customer segment	Sep. 30, 2014 customer	Jun. 30, 2015 customer
Segment Reporting [Abstract]
Number of reportable segments | segment	2
Customer Concentration Risk | Net Sales
Concentration Risk [Line Items]
Number of significant customers		0
Customer Concentration Risk | Net Sales | Alcoa
Concentration Risk [Line Items]
Number of significant customers	1
Concentration risk	13.00%
Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Number of significant customers			1
Customer Concentration Risk | Accounts Receivable | Alcoa
Concentration Risk [Line Items]
Number of significant customers	1
Concentration risk	16.00%		17.00%