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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Operating Loss Carryforwards [Line Items]      
Current Foreign Tax Expense (Benefit) $ 40,000 $ 500,000 $ 300,000
Deferred federal income tax expense (benefit) 0 0 0
Franchise tax expense 500,000 400,000 $ 200,000
Federal Operating Loss Carryforwards 752,700,000    
State Operating Loss Carryforwards 414,700,000    
Tax Credits, State 11,600,000    
Amount of Tax Credits to Expire 600,000    
Unrecognized Tax Benefits 15,700,000 15,700,000  
Unrecognized tax benefits, provision for interest or penalties 0 $ 0  
Federal [Member]      
Operating Loss Carryforwards [Line Items]      
Windfall benefits not recognized arising from share-based compensation in operating loss carryforwards $ 7,400,000    
Federal [Member] | Minimum [Member]      
Operating Loss Carryforwards [Line Items]      
Tax Credit Carryforward, Expiration Date Jan. 01, 2019    
Federal [Member] | Maximum [Member]      
Operating Loss Carryforwards [Line Items]      
Tax Credit Carryforward, Expiration Date Jan. 01, 2037    
State [Member]      
Operating Loss Carryforwards [Line Items]      
Windfall benefits not recognized arising from share-based compensation in operating loss carryforwards $ 6,300,000    
State [Member] | Minimum [Member]      
Operating Loss Carryforwards [Line Items]      
Tax Credit Carryforward, Expiration Date Jan. 01, 2018    
State [Member] | Maximum [Member]      
Operating Loss Carryforwards [Line Items]      
Tax Credit Carryforward, Expiration Date Jan. 01, 2037