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Real Estate Properties - Purchase Price Allocations (Details)
$ in Thousands
6 Months Ended
Mar. 31, 2018
USD ($)
property
Business Acquisition [Line Items]  
Number of properties acquired | property 4
Previously Acquired  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]  
Total consideration $ 181,301
Previously Acquired | Land  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]  
Real estate property 37,282
Previously Acquired | Buildings and Improvements  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]  
Real estate property 140,027
Previously Acquired | Acquisition-related intangible assets  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]  
Acquisition-related intangibles $ 3,992