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Summary of Significant Accounting Policies and Select Balance Sheet Information (Details Textual) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 3 Months Ended | 12 Months Ended |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Sep. 30, 2011 | Sep. 30, 2012 Security Customers | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2008 | Jun. 30, 2012 | Aug. 31, 2010 | Jun. 30, 2010 | Sep. 30, 2009 | Sep. 30, 2012 In Vitro Diagnostics [Member] | Sep. 30, 2011 In Vitro Diagnostics [Member] | Sep. 30, 2010 In Vitro Diagnostics [Member] | Aug. 31, 2010 In Vitro Diagnostics [Member] | Sep. 30, 2011 SurModics Pharmaceuticals Subsidiary [Member] | Dec. 31, 2010 SurModics Pharmaceuticals Subsidiary [Member] | Sep. 30, 2010 Patents [Member] | Jul. 31, 2007 Paragon Intellectual Properties, LLC and Apollo Therapeutics, LLC [Member] | Jan. 31, 2005 OctoPlus [Member] | Mar. 31, 2012 OctoPlus [Member] | Sep. 30, 2012 OctoPlus [Member] | Sep. 30, 2011 OctoPlus [Member] | Sep. 30, 2010 OctoPlus [Member] | Sep. 30, 2008 OctoPlus [Member] | May 01, 2005 ThermopeutiX, Inc. [Member] | Sep. 30, 2006 ViaCyte [Member] | Sep. 30, 2012 ViaCyte [Member] | Sep. 30, 2010 Nexeon MedSystems, Inc. [Member] | Sep. 30, 2009 Nexeon MedSystems, Inc. [Member] | Mar. 31, 2010 Vessix Vascular, Inc. [Member] | Sep. 30, 2012 Vessix Vascular, Inc. [Member] | Sep. 30, 2010 Vessix Vascular, Inc. [Member] | Aug. 31, 2009 Vessix Vascular, Inc. [Member] | Sep. 30, 2010 Other [Member] | Sep. 30, 2012 Maximum [Member] | Sep. 30, 2012 Maximum [Member] ThermopeutiX, Inc. [Member] | Sep. 30, 2012 Maximum [Member] ViaCyte [Member] | Sep. 30, 2012 Maximum [Member] Nexeon MedSystems, Inc. [Member] | Sep. 30, 2012 Maximum [Member] Vessix Vascular, Inc. [Member] | Sep. 30, 2010 Laboratory Fixtures and Equipment [Member] | Sep. 30, 2010 Prototypes and Other Equipment [Member] | Sep. 30, 2010 Certain Fixed Asset [Member]
Summary of Significant Accounting Policies and Select Balance Sheet Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial Equity Investment in Octoplus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's Total Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership Interest in OctoPlus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Loss on investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |  | 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Previous cost basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain or Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Loss/Gain |  | 335,000 | (804,000) | (437,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (200,000) |  | (500,000) | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost basis in the Company's investment in OctoPlus |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected gain on sale of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |
Investment in various securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 | 5,200,000 | 600,000 |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 5.00% | 20.00% | 20.00% |  |  |
Cost basis investment in company after consideration impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Equity Investment |  |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment Loss on the Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,300,000 |  |  |  | 2,400,000 |  | 200,000 |  |  |  |  |  |  |  |
Proceeds on Sale of Investment at Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,500,000 |  |  |  |  |  |  |  |  |  |  |
Follow on Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | 28,100,000 |  |  | 3,006,000 |  |  |  |  |  |  |  |  |  | 28,100,000 |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 | 400,000 | 1,300,000
Goodwill | 8,010,000 | 8,010,000 | 8,010,000 |  |  |  |  |  |  | 8,000,000 | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  | 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess in fair value over carrying value |  |  |  |  |  |  |  |  |  |  |  |  | 82.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customer percentage of total revenue |  | 19.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies and Select Balance Sheet Information (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of held to maturity debt securities |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of held-to-maturity debt securities | 3,000,000 |  | 3,000,000 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair market value of held-to-maturity debt securities | 3,100,000 |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  | 2,200,000 | 2,400,000 | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized Revenue |  | 100,000 | 100,000 | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization Expense |  | 700,000 | 700,000 | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's stock price |  | $ 19.00 |  | $ 11.92 |  |  | $ 12.03 |  | $ 24.13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.00 |  |  |  |  |  |  |
Percentage of increase in market capitalization over Company's book value |  |  |  |  |  |  |  | 64.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxes collected from customers and remitted to governmental authorities |  | 100,000 | 100,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product sales payment terms, Minimum |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product sales payment terms, Maximum |  | 45 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue | $ 300,000 | $ 200,000 | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average diluted shares outstanding excluded outstanding stock options |  | 0.6 | 1.1 | 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers represents more than 6% of revenue |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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