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Income Taxes (Details Textual) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Oct. 31, 2012
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Oct. 31, 2011
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Oct. 31, 2010
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| Income Tax Disclosure [Abstract] | |||
| Unrecognized tax benefits, interest and penalties accured | $ 1,400,000 | $ 1,100,000 | |
| Unrecognized tax benefits, interest and penalties (benefit) expense | 300,000 | (300,000) | 200,000 |
| Net operating loss carryforwards subject to expiration | 2,800,000,000 | ||
| Income tax credit carryforwards subject to expiration | 100,000,000 | ||
| Cumulative tax benefit credited to additional paid in capital, equity compensation and call spread option | $ 78,000,000 | ||