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Benefit Plans 5 (Details) (USD $) | 12 Months Ended | 3 Months Ended |  |  |
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Oct. 31, 2012 | Oct. 31, 2011 | Oct. 31, 2010 | Jul. 31, 2012 Employee Stock Purchase Plan [Member] | Jan. 31, 2012 Employee Stock Purchase Plan [Member] | Oct. 31, 2012 Employee Stock Purchase Plan [Member] | Nov. 02, 2011 Employee Stock Purchase Plan [Member] | Oct. 31, 2011 Employee Stock Purchase Plan [Member]
Employee Stock Purchase Plan Disclosures [Line Items] |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 5,000,000 |  |  |  |  | 774,373 |  | 998,060
Stock Issuance Terms |  |  |  |  |  | 85.00% | 85.00% |
Weighted Average Expented Life Assumption for Employee Stock Purchase Plan | 0 years 6 months | 0 years 6 months | 0 years 6 months |  |  |  |  |
Weighted Average Risk Free Interest Rate for Employee Stock Purchase Plan | 0.70% | 0.20% | 0.20% |  |  |  |  |
Volatility for Employee Stock Purchase Plan | 92.00% | 90.50% | 94.00% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 0.87 |  |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  |  | (131,019) | (92,668) |  |  |
Weighted Average Dividend Yield for Employee Stock Purchase Plan | 0.00% | 0.00% | 0.00% |  |  |  |  |

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