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Shareholders’ Equity (Details)
 4 Months Ended 12 Months Ended
Jun. 05, 2015
USD ($)
segment
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Class of Stock [Line Items]          
Payments to acquire interests     $ 2,479,000 $ 0 $ 0
Class A common shares          
Class of Stock [Line Items]          
Common stock shares authorized | shares   31,000,000 31,600,000 31,000,000  
Increase of par value, common stock   $ 361,585,000      
Number of votes for each share held | segment 1        
Common stock, par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001 $ 0.001  
Class B-1 common shares          
Class of Stock [Line Items]          
Common stock shares authorized | shares   1,000,000 1,000,000 1,000,000  
Increase of par value, common stock   $ 11,520,000      
Number of votes for each share held | segment 10        
Conversion ratio 1   1    
Common stock, par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001 $ 0.001  
Class B-2 common shares          
Class of Stock [Line Items]          
Common stock shares authorized | shares   15,000,000 15,000,000 15,000,000  
Number of votes for each share held | segment 10        
Common stock, par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001 $ 0.001  
Class A membership units          
Class of Stock [Line Items]          
Conversion ratio 1   1    
ABP Trust | Class A common shares          
Class of Stock [Line Items]          
Common stock shares issued | shares 15,000,000        
Deemed distribution $ 165,796,000        
ABP Trust | Class B-1 common shares          
Class of Stock [Line Items]          
Limited partner contribution $ 11,520,000        
Common stock shares issued | shares 1,000,000        
Increase of par value, common stock $ 1,000        
ABP Trust | Class B-2 common shares          
Class of Stock [Line Items]          
Common stock shares issued | shares 15,000,000        
Common stock, par value (in dollars per share) | $ / shares $ 15        
Common stock historical basis $ 1,983,000        
Managed REITs | Class A common shares          
Class of Stock [Line Items]          
Limited partner contribution $ 167,764,000        
Common stock shares issued | shares 15,000,000        
Increase of par value, common stock $ 15,000        
2016 Plan | Class A common shares          
Class of Stock [Line Items]          
Shares of common stock authorized to be repurchased (in shares) | shares 600,000        
Additional Paid In Capital | Class A common shares          
Class of Stock [Line Items]          
Increase of par value, common stock   $ 361,570,000      
Additional Paid In Capital | Class B-1 common shares          
Class of Stock [Line Items]          
Increase of par value, common stock   11,519,000      
Additional Paid In Capital | Class B-2 common shares          
Class of Stock [Line Items]          
Increase of par value, common stock   $ (15,000)      
Additional Paid In Capital | ABP Trust | Class B-1 common shares          
Class of Stock [Line Items]          
Increase of par value, common stock $ 11,519,000        
Additional Paid In Capital | Managed REITs | Class A common shares          
Class of Stock [Line Items]          
Increase of par value, common stock 361,570,000        
RMR LLC | Class B-2 common shares          
Class of Stock [Line Items]          
Payments to acquire interests $ 167,764,000