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Acquisition of MPC Partnership Holdings LLC - Narrative (Details) $ in Thousands		1 Months Ended	12 Months Ended
	Dec. 19, 2023 USD ($) property fund	Jul. 31, 2024 USD ($) unit	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Oct. 01, 2022 USD ($)
Business Acquisition [Line Items]
Recognition of Earnout liability			$ 14,547	$ 0	$ 0
Goodwill			71,761	1,859
Total noncontrolling interests			$ 181,843	183,597
Percent of construction supervision			5.00%
Property management fees revenue			$ 76,444	$ 63,153	59,667
RMR Residential Acquisition
Business Acquisition [Line Items]
Number of units acquired | unit		240
Transaction costs		$ 509
Purchase price		$ 70,000
Woodstock Property
Business Acquisition [Line Items]
Disposal consideration			9,800
Disposal depreciation			221
Disposal amortization			331
Liabilities held for sale			$ 15
CARROLL Multifamily Venture VII, LP
Business Acquisition [Line Items]
Purchase price					$ 213
MPC Partnership Holdings LLC
Business Acquisition [Line Items]
Number of real estate properties | property	66
Properties with no ownership interest | property	14
Percent of construction supervision	5.00%
Mortgages
Business Acquisition [Line Items]
Debt instrument, interest rate, stated percentage		5.34%
Maximum
Business Acquisition [Line Items]
Percent of gross collected rents			3.50%
Maximum | MPC Partnership Holdings LLC
Business Acquisition [Line Items]
Percent of gross collected rents	3.50%
Property management fees revenue	$ 200
Minimum
Business Acquisition [Line Items]
Percent of gross collected rents			2.50%
Minimum | MPC Partnership Holdings LLC
Business Acquisition [Line Items]
Percent of gross collected rents	2.50%
Property management fees revenue	$ 100
MPC Partnership Holdings LLC
Business Acquisition [Line Items]
Payments to acquire businesses, gross	80,000
Transaction costs	4,200					$ 7,302
Goodwill	69,902
Mortgage note payable	$ 4,726
MPC Partnership Holdings LLC | CARROLL Multifamily Venture VII, LP
Business Acquisition [Line Items]
Number of funds | fund	4
Number of funds fully funded | fund	3
Unfunded commitment capital	$ 208,026
Committed capital	342,825
MPC Partnership Holdings LLC | Mortgages
Business Acquisition [Line Items]
Mortgage note payable	4,726
Mortgage note payable	$ 5,429
Debt instrument, interest rate, stated percentage	3.71%
Debt, year one	$ 8
Debt, year two	98
Debt, year three	102
Debt, year four	105
Debt, after year four	$ 5,116
MPC Partnership Holdings LLC | Building and improvements
Business Acquisition [Line Items]
Weighted average useful life	25 years
MPC Partnership Holdings LLC | Acquired leases
Business Acquisition [Line Items]
Amortization period	2 years 10 months 24 days
MPC Partnership Holdings LLC | Property management and investment management agreements
Business Acquisition [Line Items]
Weighted average useful life	5 years 7 months 6 days
MPC Partnership Holdings LLC | Investor relationships
Business Acquisition [Line Items]
Weighted average useful life	5 years
MPC Partnership Holdings LLC | 260 Woodstock Investor, LLC
Business Acquisition [Line Items]
Ownership percentage	90.00%
Total noncontrolling interests	$ 444
MPC Partnership Holdings LLC | Maximum
Business Acquisition [Line Items]
Recognition of Earnout liability	$ 20,000

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