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Real Estate Properties - Purchase Price Allocations (Details)
$ in Thousands
9 Months Ended
Jun. 30, 2018
USD ($)
property
Business Acquisition [Line Items]  
Number of properties acquired | property 6
Previously Acquired  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]  
Acquisition-related intangibles $ 5,355
Total consideration 233,398
Previously Acquired | Land  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]  
Real estate property 44,040
Previously Acquired | Buildings and Improvements  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]  
Real estate property $ 184,003