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Share-Based Compensation Plans (Details) (USD $)
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6 Months Ended |
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Apr. 30, 2013
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Oct. 31, 2012
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Apr. 30, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period |
178,663 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price |
$ 6.47 |
$ 6.96 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |
3,120,456 |
|
3,300,000 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |
279,746 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |
3,221,539 |
|
3,300,000 |
| Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |
$ 0.94 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price |
$ 6.32 |
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