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Basis of Presentation and Significant Accounting Policies - Narrative (Details)
3 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
Oct. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
Oct. 31, 2018
USD ($)
Basis of Presentation [Line Items]        
Accrued compensation   $ 187,600,000 $ 189,300,000  
Social security tax, employer, deferral, CARES Act   $ 101,000,000    
Ownership percentages   33.00%    
Investments in unconsolidated affiliates   $ 11,000,000.0 8,900,000 $ 11,300,000
Proceeds from redemption of auction rate security   5,000,000.0 0 2,900,000
Auction rate securities   0    
Advertising expense   $ 1,800,000 $ 1,700,000 $ 2,300,000
Auction rate securities        
Basis of Presentation [Line Items]        
Proceeds from redemption of auction rate security $ 5,000,000.0      
Pandemic        
Basis of Presentation [Line Items]        
Compensation related costs, percent of health insurance premiums paid by employer, COVID-19   1    
Accrued compensation   $ 0    
Minimum        
Basis of Presentation [Line Items]        
Ownership percentages   20.00%    
Lease term   1 year    
Maximum        
Basis of Presentation [Line Items]        
Ownership percentages   50.00%    
Lease term   30 years