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Other Income - Net (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Oct. 31, 2015
Schedule of Equity Method Investments [Line Items]          
Land sales earnings, net $ 2,587 $ 1,527 $ 3,287 $ 5,086  
Income from Ancillary Businesses, net 4,873 7,481 7,456 9,716  
Land Sales 38,218 2,123 45,186 146,837  
Rental Property Joint Venture Metro Washington, D.C. Two and Rental Property Joint Venture Belmont, MA [Member]          
Schedule of Equity Method Investments [Line Items]          
Land Sales 28,800        
Rental Property Joint Venture Metro Washington, D.C. Two [Member]          
Schedule of Equity Method Investments [Line Items]          
Land sales earnings, net 1,000        
Retail Land Sales, Installment Method, Gross Profit, Deferred 3,834 3,834  
Home Building Joint Venture Metro New York Four [Member]          
Schedule of Equity Method Investments [Line Items]          
Land Sales       $ 143,300  
Equity Method Investment, Ownership Percentage   20.00%   20.00%  
Home Building Joint Venture Metro New York Three [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investment, Ownership Percentage         25.00%
Retail Land Sales, Installment Method, Gross Profit, Deferred         $ 9,300
Apartment living [Member]          
Schedule of Equity Method Investments [Line Items]          
Income from Ancillary Businesses, net $ 1,700 $ 1,300 $ 4,000 $ 2,800  
Co-venturer [Member] | Rental Property Joint Venture Metro Washington, D.C. Two and Rental Property Joint Venture Belmont, MA [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investment, Ownership Percentage 50.00%   50.00%    
Co-venturer [Member] | Rental Property Joint Venture Metro Washington, D.C. Two [Member]          
Schedule of Equity Method Investments [Line Items]          
Land Sales $ 17,800        
Equity Method Investment, Ownership Percentage 50.00%   50.00%