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Loans Payable, Senior Notes and Mortgage Company Loan Facility Senior Notes Payable (Details Textual 4)
$ in Thousands
3 Months Ended
Jan. 31, 2018
USD ($)
debtissuances
Jul. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
Oct. 31, 2017
USD ($)
Jun. 12, 2017
USD ($)
Mar. 10, 2017
USD ($)
Senior Note Payable (Textual) [Abstract]            
Number of issuances of senior debt | debtissuances 8          
Proceeds from Issuance of Senior Long-term Debt $ 2,859,689     $ 2,462,463    
Senior Notes [Member]            
Senior Note Payable (Textual) [Abstract]            
Debt Instrument, Face Amount 2,870,000          
4.350% Senior Notes Due 2028 [Member]            
Senior Note Payable (Textual) [Abstract]            
Proceeds from Issuance of Senior Long-term Debt $ 400,000          
Debt Instrument, Interest Rate, Stated Percentage 4.35%          
Proceeds from Debt, Net of Issuance Costs $ 396,400          
4.875% Senior Notes Due 2027 [Member]            
Senior Note Payable (Textual) [Abstract]            
Proceeds from Issuance of Senior Long-term Debt $ 450,000       $ 150,000 $ 300,000
Debt Instrument, Interest Rate, Stated Percentage 4.875%         4.875%
Proceeds from Debt, Net of Issuance Costs   $ 156,400 $ 297,200