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

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- Definition Volatility for Employee Stock Purchase Plan + References No definition available. + Details
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- Definition Weighted Average Dividend Yield for Employee Stock Purchase Plan + References No definition available. + Details
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