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Intangible Assets (Schedule of Intangible Assets Subject to Amortization) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
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Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 30,465 | $ 30,534
Accumulated Amortization | (18,853) | (17,217)
Net Carrying Value | 11,612 | 13,317
Supply Agreement |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 17,580 | 17,580
Accumulated Amortization | (8,397) | (7,225)
Net Carrying Value | 9,183 | 10,355
Purchased Technology |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 11,749 | 11,818
Accumulated Amortization | (9,489) | (9,121)
Net Carrying Value | 2,260 | 2,697
Trade Names |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1,136 | 1,136
Accumulated Amortization | (967) | (871)
Net Carrying Value | $ 169 | $ 265

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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