v3.26.1
Related Person Transactions - Schedule of Revenues from Related Parties (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Related Party Transaction [Line Items]        
Total revenues $ 45,526 $ 44,068 $ 154,269 $ 136,965
Total reimbursable costs 102,796 107,950 309,455 396,958
Income from loan investments, net 0 677 411 1,869
Rental property revenues 5,192 2,033 15,432 5,080
Revenues 153,514 154,728 479,567 540,872
Related Party And Nonrelated Party        
Related Party Transaction [Line Items]        
Total revenues 45,526 44,068    
Revenues 153,514 154,728    
Total revenues from related parties        
Related Party Transaction [Line Items]        
Total revenues 45,526 44,068 154,269 136,965
Total reimbursable costs 102,796 107,950 309,455 396,958
Revenues 148,322 152,018 463,724 533,923
Perpetual Capital:        
Related Party Transaction [Line Items]        
Total revenues 33,468 31,189 120,389 96,275
Total reimbursable costs 78,339 91,106 241,630 333,066
Revenues 111,807 122,295 362,019 429,341
Total Managed Equity REITs        
Related Party Transaction [Line Items]        
Total revenues 32,017 29,829 116,327 92,541
Total reimbursable costs 76,948 89,842 237,788 329,003
Revenues 108,965 119,671 354,115 421,544
DHC        
Related Party Transaction [Line Items]        
Total revenues 6,342 5,292 35,889 17,318
Total reimbursable costs 22,191 21,453 64,954 86,747
Revenues 28,533 26,745 100,843 104,065
ILPT        
Related Party Transaction [Line Items]        
Total revenues 9,598 9,135 33,948 27,503
Total reimbursable costs 9,878 10,727 28,507 29,349
Revenues 19,476 19,862 62,455 56,852
OPI        
Related Party Transaction [Line Items]        
Total revenues 6,110 5,781 17,380 18,188
Total reimbursable costs 29,395 38,762 97,620 120,061
Revenues 35,505 44,543 115,000 138,249
SVC        
Related Party Transaction [Line Items]        
Total revenues 9,967 9,621 29,110 29,532
Total reimbursable costs 15,484 18,900 46,707 92,846
Revenues 25,451 28,521 75,817 122,378
SEVN        
Related Party Transaction [Line Items]        
Total revenues 1,451 1,360 4,062 3,734
Total reimbursable costs 1,391 1,264 3,842 4,063
Revenues 2,842 2,624 7,904 7,797
Private Capital:        
Related Party Transaction [Line Items]        
Total revenues 12,058 12,879 33,880 40,690
Total reimbursable costs 24,457 16,844 67,825 63,892
Revenues 36,515 29,723 101,705 104,582
Sonesta        
Related Party Transaction [Line Items]        
Total revenues 2,202 2,628 5,790 6,873
Total reimbursable costs 0 0 0 0
Revenues 2,202 2,628 5,790 6,873
RMR Residential        
Related Party Transaction [Line Items]        
Total revenues 4,435 3,454 11,365 13,878
Total reimbursable costs 4,883 5,110 14,514 18,499
Revenues 9,318 8,564 25,879 32,377
Other private entities        
Related Party Transaction [Line Items]        
Total revenues 5,421 6,797 16,725 19,939
Total reimbursable costs 19,574 11,734 53,311 45,393
Revenues 24,995 18,531 70,036 65,332
Total revenues from unrelated parties        
Related Party Transaction [Line Items]        
Total revenues 0 0 0 0
Total reimbursable costs 0 0 0 0
Revenues $ 5,192 $ 2,710 $ 15,843 $ 6,949