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Long-Term Obligations and Commitments - Secured Revolving Credit Facility (Details) - Subsidiary - Revolving Credit Facility - Line of Credit - 2019 Secured Revolving Credit Facility - USD ($)
3 Months Ended
Jul. 16, 2021
Feb. 19, 2019
Oct. 31, 2021
Oct. 31, 2020
Debt Instrument [Line Items]        
Line of credit, maximum borrowing capacity   $ 300,000,000    
Line of credit, current borrowing capacity $ 150,000,000      
Line of credit, remaining borrowing capacity $ 150,000,000      
Fair value of amount outstanding     $ 50,000,000  
Interest rate at period end     2.63%  
Secured amount     $ 232,000,000  
Periodic interest payment     $ 0 $ 1,000,000
Minimum        
Debt Instrument [Line Items]        
Interest rate on unused portion of line of credit   0.25%    
Maximum        
Debt Instrument [Line Items]        
Interest rate on unused portion of line of credit 0.75%      
LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.50%