Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Acquired Properties (Details)

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Real Estate and Intangible Assets - Summary of Acquired Properties (Details)
$ in Thousands
 9 Months Ended
Jul. 31, 2017
USD ($)
ft²
Jul. 07, 2017
USD ($)
ft²
Jun. 22, 2017
USD ($)
ft²
Sep. 12, 2016
USD ($)
ft²
May 26, 2016
USD ($)
ft²
Sep. 30, 2017
USD ($)
ft²
property
Sep. 30, 2016
USD ($)
ft²
property
Jul. 25, 2014
ft²
Business Acquisition [Line Items]                
Square Footage (unaudited) | ft²               81,371
Purchase Price           $ 94,421 $ 40,900  
Number of properties acquired | property           5 2  
Series of Property Acquisitions                
Business Acquisition [Line Items]                
Square Footage (unaudited) | ft²           666,451 226,286  
Lease Term           10 years 8 months 12 days 7 years 9 months 18 days  
Purchase Price           $ 94,421 $ 40,900  
Acquisition Expenses           1,171 179  
Annualized GAAP Rent           10,776 3,367  
Debt Issued or Assumed           54,887 24,000  
Conshohocken, Pennsylvania                
Business Acquisition [Line Items]                
Square Footage (unaudited) | ft²     60,016          
Lease Term     8 years 6 months          
Purchase Price     $ 15,700          
Annualized GAAP Rent     1,700          
Debt assumed     $ 11,200          
Stated interest rate (as percent)     1.80%          
Conshohocken, Pennsylvania | Interest rate swap                
Business Acquisition [Line Items]                
Debt assumed     $ 11,200          
Interest rate swap     $ 40     $ 200    
Conshohocken, Pennsylvania | Interest rate swap | LIBOR                
Business Acquisition [Line Items]                
Basis spread     3.55%          
Philadelphia, Pennsylvania                
Business Acquisition [Line Items]                
Square Footage (unaudited) | ft²   300,000            
Lease Term   15 years 4 months 24 days            
Purchase Price   $ 27,100            
Annualized GAAP Rent   2,300            
Debt Issued or Assumed   $ 14,900            
Stated interest rate (as percent)   3.75%            
Maitland, Florida                
Business Acquisition [Line Items]                
Square Footage (unaudited) | ft² 306,435              
Lease Term 8 years 7 months 6 days              
Purchase Price $ 51,600              
Annualized GAAP Rent 6,800              
Debt Issued or Assumed $ 28,800              
Stated interest rate (as percent) 3.89%              
Number of properties acquired | property           3    
Salt Lake City, Utah                
Business Acquisition [Line Items]                
Square Footage (unaudited) | ft²         107,062      
Lease Term         6 years      
Purchase Price         $ 17,000      
Annualized GAAP Rent         1,400      
Debt Issued or Assumed         $ 9,900      
Fort Lauderdale, FL                
Business Acquisition [Line Items]                
Square Footage (unaudited) | ft²       119,224        
Lease Term       9 years        
Purchase Price       $ 23,900        
Annualized GAAP Rent       2,000        
Debt Issued or Assumed       $ 14,100        
Asset acquisition                
Business Acquisition [Line Items]                
Purchase Price           $ 94,421 $ 0