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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2019 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018
Primary Equity Holder [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Selling, general and administrative expenses charged by primary equity holder |  |  | $ 0.2 | $ 0.6 | $ 0.5
Primary Equity Holder [Member] | Maximum [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Selling, general and administrative expenses charged by primary equity holder |  | $ 0.1 |  |  |
Management [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Rent expense |  | $ 0.5 | $ 0.4 | $ 1.5 | $ 1.0
American Industrial Partners [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Equity interest held by operating partnership, voting equity | 54.30% |  |  |  |

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