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v3.20.1

Basis of Presentation - Additional Information (Detail) $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
May 08, 2020 Business | Apr. 30, 2020 | Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($)
Subsequent Event [Member] |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |
Number of shuttle bus business sold | Business | 2 |  |  |  |  |
Primary Equity Holder [Member] |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |
Selling, general and administrative expenses charged by primary equity holder |  |  | $ 0.0 | $ 0.1 | $ 0.1 | $ 0.6
Management [Member] |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |
Rent expense |  |  | $ 0.1 | $ 0.5 | $ 0.6 | $ 1.0
American Industrial Partners [Member] |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |
Equity interest held by operating partnership, voting equity |  | 53.30% |  |  |  |

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