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Notes Payable - Additional Information (Details) - USD ($)
9 Months Ended
Aug. 01, 2019
Sep. 30, 2019
Mar. 30, 2016
Debt Instrument [Line Items]      
Minimum Repayment of Aggregate Principal Amount of Senior Notes (as a percent)   5.00%  
Outstanding Principal Amount of Senior Notes (as a percent)   100.00%  
Parent Company [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross     $ 170,000,000
Long-term Debt, Weighted Average Life 12 years    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 4.26%    
Parent Company [Member] | Series A Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross     $ 38,000,000
Debt Instrument, Interest Rate, Stated Percentage     4.88%
Parent Company [Member] | Series B Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross     $ 67,000,000
Debt Instrument, Interest Rate, Stated Percentage     5.23%
Parent Company [Member] | Series C Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross     $ 48,000,000
Debt Instrument, Interest Rate, Stated Percentage     5.48%
Parent Company [Member] | Series D Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross     $ 17,000,000
Debt Instrument, Interest Rate, Stated Percentage     5.58%
Parent Company [Member] | Series E Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 75,000,000    
Debt Instrument, Interest Rate, Stated Percentage 4.34%    
Parent Company [Member] | Series F Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 60,000,000    
Debt Instrument, Interest Rate, Stated Percentage 4.44%    
Parent Company [Member] | Series G Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 40,000,000    
Debt Instrument, Interest Rate, Stated Percentage 4.54%    
Parent Company [Member] | Series H Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 25,000,000    
Debt Instrument, Interest Rate, Stated Percentage 3.33%    
United States of America, Dollars | Parent Company [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 175,000,000    
United Kingdom, Pounds | Parent Company [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 25,000,000