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Summary of Significant Accounting Policies - Equity Method Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | May 15, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |
Distributions from equity method investments | $ 2,391 | $ 2,221 | $ 841 |
Recurring basis |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | 23,520 | 18,651 |  |
Level 1 | Recurring basis |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | 23,520 | 18,651 |  |
SEVN |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Unrealized gain (loss) on investment, fair value option | 7,260 | 5,295 | (1,564) |
Distributions from equity method investments | 2,391 | 2,221 | 841 |
Purchase price | 0 | 0 | 9,469 |
SEVN | Level 1 | Recurring basis |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 23,520 | 18,651 |  |
SEVN | Tremont Reality Capital |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of shares owned (in shares) | 1,708,058 |  |  |
Ownership percentage | 11.50% |  |  |
CARROLL Multifamily Venture VII, LP |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Purchase price |  |  | 213 |
TA |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Unrealized gain (loss) on investment, fair value option |  | $ 19,942 | $ 2,574 |
TA | RMR LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of shares owned (in shares) |  |  |  | 621,853
Ownership percentage |  |  |  | 4.10%
Aggregate cost |  |  |  | $ 13,701

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- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 21D -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-21D Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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