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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock available for future grants (in shares) 3,063,231    
Share-based Payment Arrangement, Nonemployee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 8,070 8,920 10,090
Stock option awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost not yet recognized $ 3.1    
Period for recognition 1 year 11 months 1 day    
Stock option awards | Certain employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Term of award 10 years    
Stock option awards | Nonemployee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period for non-employee director after which fair value of options granted is fully expensed on the date of grant 10 years    
Performance share awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost not yet recognized $ 9.0    
Period for recognition 1 year 9 months 18 days    
Performance goal period 3 years    
Granted (in shares) 53,976,000    
Restricted stock unit awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Compensation cost not yet recognized $ 5.3    
Period for recognition 2 years 2 months 8 days    
Granted (in shares) 73,098,000    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights percentage 200.00%    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights percentage 0.00%    
Share-based Compensation Award, Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights percentage 33.33%    
Share-based Compensation Award, Tranche One | Restricted stock unit awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights percentage 33.33%    
Share-based Compensation Award, Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights percentage 33.33%    
Share-based Compensation Award, Tranche Two | Restricted stock unit awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights percentage 33.33%    
Share-based Compensation Award, Tranche Three      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights percentage 33.33%    
Share-based Compensation Award, Tranche Three | Restricted stock unit awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights percentage 33.33%