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Summary of Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Oct. 08, 2020
Oct. 31, 2020
Dec. 18, 2020
Nov. 23, 2020
Oct. 31, 2019
Oct. 31, 2018
Summary of Significant Accounting Policies [Line Items]            
Operating lease right-of-use assets   $ 253,109     $ 0 $ 270,000
Operating lease liabilities   $ 301,419     $ 0 318,800
Deferred rent receivables           $ 48,800
Special dividends payable amount per share       $ 4.25    
Restricted Stock Units R S U [Member]            
Summary of Significant Accounting Policies [Line Items]            
Service period for awards   3 years        
Other Awards Not RSUs [Member]            
Summary of Significant Accounting Policies [Line Items]            
Service period for awards   5 years        
Subsequent Event [Member] | Restricted Stock Units R S U [Member]            
Summary of Significant Accounting Policies [Line Items]            
Special dividends payable amount per share     $ 4.25      
Morgan Stanley [Member]            
Summary of Significant Accounting Policies [Line Items]            
Per share amount received in cash in Merger Agreement $ 28.25          
Shares received in Merger Agreement 0.5833          
Computer Software, Intangible Asset [Member] | Equipment [Member]            
Summary of Significant Accounting Policies [Line Items]            
Estimated useful lives   3 years        
Maximum [Member] | Equipment [Member]            
Summary of Significant Accounting Policies [Line Items]            
Estimated useful lives   7 years        
Minimum [Member] | Equipment [Member]            
Summary of Significant Accounting Policies [Line Items]            
Estimated useful lives   3 years        
Deferred Sales Commissions [Member] | Maximum [Member]            
Summary of Significant Accounting Policies [Line Items]            
Contigent deferred sales charge, term   5 years