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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 |  |

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