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Related Person Transactions - Revenues from Related Parties (Details) - USD ($) $ in Thousands				12 Months Ended
	May 15, 2023	Jun. 29, 2022	Dec. 23, 2021	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Related Party Transaction [Line Items]
Total revenues				$ 193,920	$ 236,164	$ 199,980
Total reimbursable costs				700,776	726,152	632,523
Net Investment Income				1,313	0	0
Rental property revenues				1,604	0	0
Total revenues				$ 897,613	$ 962,316	$ 832,503
Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				100.00%	100.00%	100.00%
Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				100.00%	100.00%	100.00%
Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				100.00%	100.00%	100.00%
DHC | Joint Venture With Institutional Investor
Related Party Transaction [Line Items]
Percentage of ownership sold		10.00%	35.00%
Ownership percentage		10.00%	20.00%
Termination fee
Related Party Transaction [Line Items]
Total revenues	$ 45,282				$ 45,282
Related Party
Related Party Transaction [Line Items]
Total revenues				$ 193,920	236,033	$ 199,881
Total reimbursable costs				700,776	726,152	632,523
Total revenues				$ 894,696	$ 962,185	$ 832,404
Related Party | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				100.00%	99.90%	100.00%
Related Party | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				100.00%	100.00%	100.00%
Related Party | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				99.70%	100.00%	100.00%
Perpetual Capital:
Related Party Transaction [Line Items]
Total revenues				$ 140,648	$ 199,617	$ 168,550
Total reimbursable costs				617,765	656,632	575,098
Total revenues				$ 758,413	$ 856,249	$ 743,648
Perpetual Capital: | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				72.60%	84.50%	84.30%
Perpetual Capital: | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				88.20%	90.40%	90.90%
Perpetual Capital: | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				84.60%	89.00%	89.40%
Total Managed Equity REITs
Related Party Transaction [Line Items]
Total revenues				$ 134,882	$ 139,215	$ 148,094
Total reimbursable costs				611,701	648,291	567,346
Total revenues				$ 746,583	$ 787,506	$ 715,440
Total Managed Equity REITs | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				69.60%	58.90%	74.00%
Total Managed Equity REITs | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				87.30%	89.20%	89.70%
Total Managed Equity REITs | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				83.30%	81.90%	86.00%
DHC
Related Party Transaction [Line Items]
Total revenues				$ 24,516	$ 23,675	$ 30,343
Total reimbursable costs				127,119	156,224	157,770
Total revenues				$ 151,635	$ 179,899	$ 188,113
DHC | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				12.60%	10.00%	15.20%
DHC | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				18.10%	21.40%	24.90%
DHC | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				16.90%	18.70%	22.60%
ILPT
Related Party Transaction [Line Items]
Total revenues				$ 36,704	$ 36,834	$ 31,354
Total reimbursable costs				35,768	40,438	33,593
Total revenues				$ 72,472	$ 77,272	$ 64,947
ILPT | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				18.90%	15.50%	15.60%
ILPT | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				5.10%	5.60%	5.40%
ILPT | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				8.10%	8.00%	7.80%
OPI
Related Party Transaction [Line Items]
Total revenues				$ 29,903	$ 38,163	$ 42,204
Total reimbursable costs				212,054	334,208	308,139
Total revenues				$ 241,957	$ 372,371	$ 350,343
OPI | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				15.50%	16.20%	21.10%
OPI | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				30.30%	46.00%	48.70%
OPI | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				27.00%	38.70%	42.10%
SVC
Related Party Transaction [Line Items]
Total revenues				$ 43,759	$ 40,543	$ 44,193
Total reimbursable costs				236,760	117,421	67,844
Total revenues				$ 280,519	$ 157,964	$ 112,037
SVC | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				22.60%	17.20%	22.10%
SVC | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				33.80%	16.20%	10.70%
SVC | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				31.30%	16.50%	13.50%
SEVN
Related Party Transaction [Line Items]
Total revenues				$ 5,766	$ 5,188	$ 4,530
Total reimbursable costs				6,064	4,865	5,692
Total revenues				$ 11,830	$ 10,053	$ 10,222
SEVN | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				3.00%	2.20%	2.30%
SEVN | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				0.90%	0.70%	0.90%
SEVN | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				1.30%	1.00%	1.20%
TA
Related Party Transaction [Line Items]
Total revenues					$ 55,214	$ 15,926
Total reimbursable costs					3,476	2,060
Total revenues					$ 58,690	$ 17,986
TA | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage					23.40%	8.00%
TA | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage					0.50%	0.30%
TA | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage					6.10%	2.20%
Private Capital:
Related Party Transaction [Line Items]
Total revenues				$ 53,272	$ 36,416	$ 31,331
Total reimbursable costs				83,011	69,520	57,425
Total revenues				$ 136,283	$ 105,936	$ 88,756
Private Capital: | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				27.40%	15.40%	15.70%
Private Capital: | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				11.80%	9.60%	9.10%
Private Capital: | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				15.10%	11.00%	10.60%
AlerisLife
Related Party Transaction [Line Items]
Total revenues				$ 5,632	$ 5,414	$ 4,908
Total reimbursable costs				0	97	309
Total revenues				$ 5,632	$ 5,511	$ 5,217
AlerisLife | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				2.90%	2.30%	2.50%
AlerisLife | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				0.00%	0.00%	0.00%
AlerisLife | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				0.60%	0.60%	0.60%
Sonesta
Related Party Transaction [Line Items]
Total revenues				$ 9,362	$ 9,471	$ 8,726
Total reimbursable costs				0	544	396
Total revenues				$ 9,362	$ 10,015	$ 9,122
Sonesta | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				4.80%	4.00%	4.40%
Sonesta | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				0.00%	0.10%	0.10%
Sonesta | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				1.00%	1.00%	1.10%
RMR Residential
Related Party Transaction [Line Items]
Total revenues				$ 16,936
Total reimbursable costs				23,369
Total revenues				$ 40,305
RMR Residential | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				8.70%
RMR Residential | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				3.30%
RMR Residential | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				4.50%
Other private entities
Related Party Transaction [Line Items]
Total revenues				$ 21,342	$ 21,531	$ 17,697
Total reimbursable costs				59,642	68,879	56,720
Total revenues				$ 80,984	$ 90,410	$ 74,417
Other private entities | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				11.00%	9.10%	8.80%
Other private entities | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				8.50%	9.50%	9.00%
Other private entities | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				9.00%	9.40%	8.90%
Revenues from unrelated parties
Related Party Transaction [Line Items]
Total revenues				$ 0	$ 131	$ 99
Total reimbursable costs				0	0	0
Total revenues				$ 2,917	$ 131	$ 99
Revenues from unrelated parties | Revenue from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				0.00%	0.10%	0.00%
Revenues from unrelated parties | Revenue Not from Contract with Customer Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage				0.00%	0.00%	0.00%
Revenues from unrelated parties | Revenue Benchmark | Related Party Concentration Risk
Related Party Transaction [Line Items]
Concentration percentage					0.00%	0.00%
Revenues from unrelated parties | Revenue Benchmark | Non-Related Party Concentration
Related Party Transaction [Line Items]
Concentration percentage				0.30%
Revenues from unrelated parties | Revenue Benchmark | Non-Related Party, Investment Income Concentration
Related Party Transaction [Line Items]
Concentration percentage				0.10%
Revenues from unrelated parties | Revenue Benchmark | Non-Related Party, Revenue Concentration
Related Party Transaction [Line Items]
Concentration percentage				0.20%

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