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Mortgage financings (Details) - USD ($)
3 Months Ended
Dec. 26, 2012
Feb. 01, 2010
Jan. 31, 2016
Jan. 31, 2015
Oct. 31, 2015
Debt Instrument [Line Items]          
Amount drawn on loan     $ 315,673,000   $ 307,899,000
Construction and pre-development costs     8,538,000 $ 16,449,000  
Proceeds from construction loan     8,231,000 $ 15,193,000  
Notes Payable, Other Payables [Member] | Baltimore, MD [Member]          
Debt Instrument [Line Items]          
Construction and pre-development costs     81,800,000    
Line of credit     100,800,000    
Repayments of debt to affiliate     $ 19,000,000    
Provident Bank [Member]          
Debt Instrument [Line Items]          
Basis points, interest rate     1.25%    
Loan amount     $ 16,200,000    
Amount drawn on loan     $ 5,000,000    
Annual interest costs     3.75%    
Monthly principal payment amount     $ 27,807    
Construction Loan [Member]          
Debt Instrument [Line Items]          
Refinanced loan amount $ 15,000,000        
Loan amount     25,000,000   $ 25,000,000
Amount drawn on loan     $ 18,900,000    
Construction Loan [Member] | Baltimore, MD [Member]          
Debt Instrument [Line Items]          
Refinanced loan amount   $ 19,500,000      
Basis points, interest rate     2.25%    
Loan amount   $ 22,500,000 $ 120,000,000    
Term of the loan     4 years