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Stockholders' Equity (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Jul. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Measurement period 2 years   3 years
Performance shares (PSUs) | Share-based compensation award, tranche two | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentages 50.00%    
Performance shares (PSUs) | Share-based compensation award, tranche two | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentages 150.00%    
Performance shares (PSUs) | Share-based compensation award, tranche one      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentages 50.00%    
Performance shares (PSUs) | Share-based compensation award, tranche three      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentages 150.00%    
Restricted stock units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 5,768 $ 5,013