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Long-Term debt obligations - Additional Information (Detail)
12 Months Ended
Oct. 31, 2019
USD ($)
Dec. 18, 2019
USD ($)
Mar. 21, 2019
USD ($)
Apr. 28, 2017
Debt Instrument [Line Items]        
Revolving credit facility, maximum borrowing capacity     $ 1,000,000,000.0  
Line of credit facility, amount available $ 923,400,000      
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum        
Debt Instrument [Line Items]        
Interest rate 0.25%      
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum        
Debt Instrument [Line Items]        
Interest rate 1.50%      
Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Revolving credit facility, maximum debt to total capitalization ratio       0.50
Maximum increase, ratio of indebtedness to net capital       0.05
Minimum net worth required for compliance $ 998,600,000      
Revolving credit facility, outstanding borrowings 55,000,000.0      
Letter of Credit | Line of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding $ 21,600,000      
Subsequent Event        
Debt Instrument [Line Items]        
Line of credit facility, amount available   $ 891,900,000    
Subsequent Event | Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Revolving credit facility, outstanding borrowings   85,000,000.0    
Subsequent Event | Letter of Credit | Line of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding   $ 23,100,000