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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%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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