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Fair Value of Financial Instruments - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2021 USD ($) | Apr. 30, 2020 USD ($) reportingUnit | Jul. 31, 2021 USD ($) | Jul. 31, 2020 USD ($) | Oct. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment loss on fixed assets |  |  | $ 9,100,000 | $ 0 |
Carrying value of fixed assets | $ 111,800,000 |  | 111,800,000 |  | $ 133,700,000
Goodwill reporting units | reportingUnit |  | 3 |  |  |
Goodwill, impairment loss |  | $ 163,800,000 |  |  |
Education |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill, impairment loss |  | 99,300,000 |  | $ 99,300,000 |
Aviation |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill, impairment loss |  | 55,500,000 |  |  |
Impairment of intangible assets |  | 5,600,000 |  |  |
Impairment of intangible assets, gross |  | 13,800,000 |  |  |
Impairment of intangible assets, accumulated amortization |  | 8,200,000 |  |  |
Technical Solutions |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill, impairment loss |  | 9,000,000 |  |  |
Impairment of intangible assets |  | 3,400,000 |  |  |
Impairment of intangible assets, gross |  | 8,700,000 |  |  |
Impairment of intangible assets, accumulated amortization |  | $ 5,300,000 |  |  |
Corporate | Internal Use Software |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment loss on fixed assets | 9,100,000 |  | 9,100,000 |  |
Carrying value of fixed assets | $ 0 |  | $ 0 |  |

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