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Employee Benefit Plans (Equity Compensation Plans) - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Apr. 09, 2020
Oct. 31, 2020
Oct. 31, 2017
Oct. 31, 2019
Oct. 31, 2018
Apr. 06, 2017
Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate restricted stock units outstanding (in shares)   4,130,000 3,843,000 3,857,000 3,769,000  
Restricted Stock Units | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, (in years)   3 years        
Restricted Stock Units | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, (in years)   4 years        
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate restricted stock units outstanding (in shares)   9,000 38,000 11,000 20,000  
Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grant (in shares) [1]   12,129,000 12,583,000 12,208,000 12,439,000  
2006 Employee Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation arrangement for options contractual term (in years)   7 years        
Vesting period, (in years)   4 years        
Additional reserved for future issuance under the 2006 Employee Plan (in shares) 3,500,000          
Shares available for future grant (in shares)   12,100,000        
2006 Employee Equity Incentive Plan | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate restricted stock units outstanding (in shares)   4,100,000        
2006 Employee Equity Incentive Plan | Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate stock options outstanding (in shares)   3,900,000        
2005 Non Employee Directors Plan | Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate stock options outstanding (in shares)   29,222        
Aggregate stock options granted under director plan (in shares)     188,709      
Fair value of option shares granted     $ 6.7      
2005 Non Employee Directors Plan | Stock Option | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, (in years)     3 years      
2005 Non Employee Directors Plan | Stock Option | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, (in years)     4 years      
2017 Directors Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Reserved for future issuance (in shares)   389,682       450,000
Restricted stock awards issued (in shares)   9,412        
Aggregate grant date fair value of restricted stock awards   $ 1.3        
2017 Directors Plan | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate restricted stock units outstanding (in shares)   9,412        
2017 Directors Plan | Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate stock options outstanding (in shares)   5,998        
Aggregate stock options granted under director plan (in shares)   5,998        
Fair value of option shares granted   $ 1.4        
2017 Directors Plan | Stock Option | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, (in years)   3 years        
Other Assumed Stock Plans            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Assumed shares remaining outstanding (in shares)   100,000        
[1]
Excluding shares reserved for future issuance under the 2017 Directors Plan.