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Revenue Recognition - Advisory Agreements (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Related Party Transaction [Line Items]        
Revenue $ 138,649 $ 143,715 $ 439,402 $ 554,124
Tremont Advisors        
Related Party Transaction [Line Items]        
Business management fee percent based on management agreements     1.50%  
Minimum | Tremont Advisors        
Related Party Transaction [Line Items]        
Advisory fee percentage based on aggregate principal amounts of loan originate     0.50%  
Maximum | Tremont Advisors        
Related Party Transaction [Line Items]        
Advisory fee percentage based on aggregate principal amounts of loan originate       1.00%
Advisory services        
Related Party Transaction [Line Items]        
Revenue 625 802 $ 2,252 $ 2,345
Management services        
Related Party Transaction [Line Items]        
Revenue 38,625 43,641 $ 129,221 133,729
RMRM        
Related Party Transaction [Line Items]        
Advisory fee percent     0.85%  
RMR Advisors and Tremont Advisors | Advisory services        
Related Party Transaction [Line Items]        
Revenue 585 767 $ 2,139 2,225
Tremont Advisors | Advisory services        
Related Party Transaction [Line Items]        
Revenue 40 35 113 120
Tremont Advisors | Management services        
Related Party Transaction [Line Items]        
Revenue $ 34 $ 37 $ 816 $ 194