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Quarterly Financial Data (Unaudited) (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010 | Mar. 31, 2012 OctoPlus [Member] | Sep. 30, 2011 SurModics Pharmaceuticals Subsidiary [Member] | Dec. 31, 2010 SurModics Pharmaceuticals Subsidiary [Member] | Sep. 30, 2012 Corporate [Member] | Sep. 30, 2012 Corporate [Member] | Sep. 30, 2010 Corporate [Member]
Quarterly financial data (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment loss on investment |  |  |  |  |  | $ 800,000 |  |  |  |  |
Modified tender offer cost |  |  |  |  |  |  |  |  | 500,000 | 500,000 |
Restructuring charges | 1,000,000 | 600,000 | 0 | 1,616,000 | 1,204,000 |  |  | 600,000 |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  | 5,700,000 |  |  |
Asset impairment charges | $ 28,100,000 |  |  |  | $ 3,006,000 |  | $ 28,100,000 |  |  |  | $ 3,006,000

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