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Basis of Presentation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Primary Equity Holder [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Selling, general and administrative expenses charged by primary equity holder   $ 0.1 $ 0.1 $ 0.6 $ 0.3
Management [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Rent expense   $ 0.5 $ 0.4 $ 1.0 $ 0.6
American Industrial Partners [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Equity interest held by operating partnership, voting equity 53.80%