v3.26.1
Investments (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 21, 2026
USD ($)
unit
Nov. 10, 2025
USD ($)
shares
Mar. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
unit
joint_venture
$ / shares
shares
Jun. 30, 2025
USD ($)
Jun. 17, 2026
USD ($)
$ / shares
Apr. 30, 2026
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
Schedule of Equity Method Investments [Line Items]                    
Gain (loss) on investments       $ 21,348 $ (215) $ 17,389 $ (1,995)      
Distributions from investments           3,458 1,793      
Offering price per share (in usd per share) | $ / shares                 $ 1.20  
Investments       136,200   $ 136,200       $ 31,900
Number of joint ventures owned | joint_venture           2        
Acquisition fee revenue       $ 579 664 $ 579 664      
Common shares                    
Schedule of Equity Method Investments [Line Items]                    
Common stock, par value (in usd per share) | $ / shares       $ 0.01   $ 0.01        
Residential Community, Pompano Beach, FL                    
Schedule of Equity Method Investments [Line Items]                    
Number of units acquired | unit           225        
Residential Community, Sunrise, FL                    
Schedule of Equity Method Investments [Line Items]                    
Number of units acquired | unit           400        
Sunrise JV                    
Schedule of Equity Method Investments [Line Items]                    
Purchase price           $ 190,100        
Residential Community, Greenwich                    
Schedule of Equity Method Investments [Line Items]                    
Number of units acquired | unit 406                  
Purchase price $ 350,000                  
Acquisition fee revenue $ 579                  
RMR LLC                    
Schedule of Equity Method Investments [Line Items]                    
Common stock, shares issued (in shares) | shares                 41,666,666  
Payments for common stock                 $ 50,000  
SEVN                    
Schedule of Equity Method Investments [Line Items]                    
Payments to acquire equity method investments           24,824 0      
Investments       $ 38,591   38,591       17,610
Gain (loss) on investments       2,243 (120) (801) (1,110)      
Distributions from investments       $ 1,282 597 $ 3,042 1,793      
Carroll MF VII, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Payments to acquire equity method investments     $ 851              
Ownership percentage       14.30%   14.30%        
Capital contributions     $ 139              
Committed capital           $ 714        
CARROLL Multifamily Venture VII, LP                    
Schedule of Equity Method Investments [Line Items]                    
Gain (loss) on investments       $ (411) $ (95) (1,326) (885)      
Investments       $ 2,106   2,106       $ 3,156
Sunrise JV                    
Schedule of Equity Method Investments [Line Items]                    
Payments to acquire equity method investments           11,151        
Residential Community, Greenwich                    
Schedule of Equity Method Investments [Line Items]                    
Ownership percentage 5.00%                  
Investments $ 6,425                  
SVC                    
Schedule of Equity Method Investments [Line Items]                    
Payments to acquire equity method investments           $ 50,000 $ 0      
Ownership percentage       6.40%   6.40%        
Investments       $ 70,417   $ 70,417        
Gain (loss) on investments       20,833   20,833        
Distributions from investments       416   416        
OPI                    
Schedule of Equity Method Investments [Line Items]                    
Investments       7,464   7,464        
Gain (loss) on investments       $ (1,317)   $ (1,317)        
Investments               $ 8,778    
OPI | Common shares                    
Schedule of Equity Method Investments [Line Items]                    
Common stock, par value (in usd per share) | $ / shares               $ 0.01    
Shares received as percentage of outstanding shares               2.00%    
Tremont Reality Capital | SEVN | Total revenues from related parties                    
Schedule of Equity Method Investments [Line Items]                    
Number of shares owned (in shares) | shares       4,577,835   4,577,835        
Ownership percentage       20.20%   20.20%        
Transferrable Rights Offering | SEVN                    
Schedule of Equity Method Investments [Line Items]                    
Number of shares purchased (in shares) | shares   854,029,000                
Payments to acquire equity method investments   $ 7,387                
Transferrable Rights Offering | SEVN                    
Schedule of Equity Method Investments [Line Items]                    
Sale of stock transaction   $ 65,200                
Shares Purchased Outside of Rights Offering | SEVN                    
Schedule of Equity Method Investments [Line Items]                    
Number of shares purchased (in shares) | shares   2,015,748,000                
Payments to acquire equity method investments   $ 17,436