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Commitments and Contingencies - Additional Information (Detail) - USD ($)
6 Months Ended 12 Months Ended
Apr. 30, 2019
Oct. 31, 2018
Loss Contingencies [Line Items]    
Contingent liability under purchase agreements for future chassis inventory purchases $ 55,000,000 $ 54,500,000
Repurchase agreement 2 years  
Represents the gross value of all vehicles under repurchase agreements $ 258,800,000 310,500,000
Maximum [Member]    
Loss Contingencies [Line Items]    
Estimated loss exposure under contract $ 26,100,000 $ 25,200,000