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Real Estate - Text (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Real Estate Properties [Line Items] |  |  |
Real estate | $ 2,266.2 | $ 1,790.3 |
Payments to Acquire Residential Real Estate | 570.0 |  |
Payments to Develop Real Estate Assets | 1,000.0 |  |
Asset Impairment Charges | 0.0 | 19.4 | $ 3.8
Loss on Contract Termination | 4.1 | 4.6 | $ 8.7
Developed and under development projects |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate | 2,126.1 | 1,760.8 |
Land held for future development |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate | $ 140.1 | $ 29.5 |
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 Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-4 + Details
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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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- Definition The loss recognized on termination of a contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 912 -SubTopic 275 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479072/912-275-50-4 + Details
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- Definition The cash outflow from the acquisition of residential property intended to generate income for the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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- Definition Payments to develop real estate assets is the process of adding improvements on or to a parcel of land. Such improvements may include drainage, utilities, subdividing, access, buildings, and any combination of these elements; and are generally classified as cash flow from investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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