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Real Estate - Text (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Real Estate Properties [Line Items] |  |  |
Real estate | $ 2,645.1 | $ 2,266.2 |
Payments to Acquire Residential Real Estate | 595.3 |  |
Payments to Develop Real Estate Assets | 1,100.0 |  |
Asset Impairment Charges | 0.0 | 0.0 | $ 19.4
Loss on Contract Termination | 7.2 | 4.1 | $ 4.6
Developed and under development projects |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate | 2,465.1 | 2,126.1 |
Land held for future development |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate | $ 180.0 | $ 140.1 |
D.R. Horton, Inc. [Member] | Minimum |  |  |
Real Estate Properties [Line Items] |  |  |
Related Party Transaction, Rate | 12.00% |  |
D.R. Horton, Inc. [Member] | Maximum |  |  |
Real Estate Properties [Line Items] |  |  |
Related Party Transaction, Rate | 16.00% |  |

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- Definition Carrying amount as of the balance sheet date, net of valuation allowances and impairment losses, of costs of land expected to be developed in the near term plus capitalized costs of development, for purposes of selling completed units to home buyers or commercial or industrial entities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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