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Other Income (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2017
Apr. 30, 2016
Jul. 31, 2015
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Schedule of Equity Method Investments [Line Items]            
Income from Ancillary Businesses       $ 16,276 $ 17,473 $ 23,530
Land Sales       284,928 85,268 183,870
Rental Property Joint Venture Princeton Junction [Member]            
Schedule of Equity Method Investments [Line Items]            
Deferred gain on land sale to joint venture       (2,996)    
Home Building Joint Venture Metro New York Five [Member]            
Schedule of Equity Method Investments [Line Items]            
Land Sales       $ 257,800    
Home Building Joint Venture Metro New York Three [Member]            
Schedule of Equity Method Investments [Line Items]            
Land Sales           78,500
Equity Method Investment, Ownership Percentage 25.00%     25.00%    
Deferred gain on land sale to joint venture     $ (9,300)     (9,260)
Rental Property Joint Ventures Metro Washington, D.C. [Member]            
Schedule of Equity Method Investments [Line Items]            
Land Sales         38,100  
Deferred gain on land sale to joint venture       $ (2,999) (2,999)  
Home Building Joint Venture Metro New York Four [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage 20.00%     20.00%    
Security Monitoring Business [Member]            
Schedule of Equity Method Investments [Line Items]            
Income from Ancillary Businesses         $ 1,600 $ 8,100
Co-venturer [Member] | Rental Property Joint Venture Princeton Junction [Member]            
Schedule of Equity Method Investments [Line Items]            
Land Sales $ 10,200          
Equity Method Investment, Ownership Percentage 75.00%     75.00%    
Co-venturer [Member] | Rental Property Joint Ventures Metro Washington, D.C. [Member]            
Schedule of Equity Method Investments [Line Items]            
Land Sales   $ 20,200        
Equity Method Investment, Ownership Percentage         50.00%  
Minimum [Member] | Home Building Joint Venture Metro New York Four [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage 20.00%     20.00%