Indebtedness - Narrative (Details)	1 Months Ended			12 Months Ended
	Aug. 31, 2025 USD ($) extension community	Jan. 31, 2025	Jul. 31, 2024 USD ($)	Sep. 30, 2025 USD ($) unit	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Line of Credit Facility [Line Items]
Payment of deferred financing fees				$ 2,719,000	$ 1,960,000	$ 0
Interest Rate Cap
Line of Credit Facility [Line Items]
Strike Rate	3.00%
Notional Amount	$ 1,945,000
RMR Residential Acquisition
Line of Credit Facility [Line Items]
Number of units acquired | unit				240
Purchase price	$ 143,386,000		$ 70,000
Number of communities acquired | community	2
Mortgages
Line of Credit Facility [Line Items]
Principal Balance	$ 93,200,000
Payment of deferred financing fees				$ 2,547,000
Unamortized deferred financing fees				2,461,000
Debt Instrument, loan commitments				14,654,000
Number of options to extend maturity date | extension	2
Debt instrument, term of extension	1 year
Mortgages | Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	2.50%
Mortgages | Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	2.55%
Mortgages | Mortgage Notes Payable, Maturing July 2029
Line of Credit Facility [Line Items]
Principal Balance			$ 46,500,000
Debt instrument, interest rate, stated percentage			5.34%
Payment of deferred financing fees					1,399,000
Unamortized deferred financing fees				1,071,000	1,351,000
UBS Master Repurchase Agreement | Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				$ 200,000	$ 200,000,000
Upfront fee					0.60%
Percentage of purchase price				80.00%
Percentage of guarantee of purchase price				25.00%
Percentage of guarantee of loss				100.00%
Minimum tangible net worth				$ 100,000,000
Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				$ 100,000,000
Debt instrument, basis spread on variable rate		2.25%
Debt instrument, term of extension		1 year
Line of credit facility, unused capacity, commitment fee percentage		0.50%