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Benefit Plans - Fair Value of Shares under ESPP Determined at Grant Date (Details) | 12 Months Ended
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Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Expected life (in years) | 6 months | 6 months | 6 months
Risk free interest rate | 0.46% | 0.30% | 0.07%
Volatility | 75.00% | 37.00% | 72.00%
Dividends yield | 0.00% | 0.00% | 0.00%

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