Business Segments - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2016 customer	Mar. 31, 2015 customer	Mar. 31, 2016 customer segment	Mar. 31, 2015 customer	Jun. 30, 2015
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	1	1
Concentration risk (percent)	11.00%	12.00%	13.00%
Customer Concentration Risk | Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of significant customers			2
Customer Concentration Risk | Accounts Receivable [Member] | Alcoa
Concentration Risk [Line Items]
Number of significant customers				1
Concentration risk (percent)			24.00%		17.00%