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Benefit Plans - Fair Value of Shares under ESPP Determined at Grant Date (Details)	12 Months Ended
	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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