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Loans Payable, Senior Notes and Mortgage Company Loan Facility Credit Facility (Details Textual 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2020
Apr. 30, 2020
Oct. 31, 2019
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,689,850  
Long-term Line of Credit   1,240,626  
Oct 2019 Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,905,000  
Debt Instrument, Term   5 years  
Debt Instrument, Maturity Date   Nov. 01, 2024  
Maximum Permissible Leverage Ratio   175.00%  
Minimum Net Worth Required for Compliance   $ 2,110,000  
Existing Leverage Ratio   0.75  
Tangible Net Worth   $ 4,510,000  
Ability to repurchase common stock   3,030,000  
Ability to pay dividends   2,410,000  
Long-term Line of Credit   450,000 $ 0
Letters of Credit Outstanding, Amount   $ 164,800  
Debt Instrument, Interest Rate at Period End   1.71%  
Guarantor Subsidiaries [Member]      
Line of Credit Facility [Line Items]      
Noncontrolling Interest, Ownership Percentage by Parent   100.00%  
Subsequent Event [Member] | Oct 2019 Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Repayments of Lines of Credit $ 100,000