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v3.25.3

Summary of Significant Accounting Policies (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2025 USD ($) Home | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Business Information [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 2,985.4 | $ 4,516.4 |
Payments to Acquire Businesses, Net of Cash Acquired |  | 53.1 | 40.4 | $ 212.9
Advertising expense |  | 108.2 | 72.3 | $ 64.7
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | $ 0.0 | 0.0 |
Subsequent Event [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 80.0 |  |  |
Business Acquisition, Number of Homes Acquired | Home | 160 |  |  |
Business Acquisition, Number of Lots Acquired | Home | 260 |  |  |
Business Acquisition, Backlog Acquired | Home | 110 |  |  |
Business Acquisition, Number of Controlled Lots Acquired through Land Purchase Contracts | Home | 1,320 |  |  |
Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Remaining vesting period |  | 4 years 1 month 6 days |  |
Forestar Group [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 62.00% |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 38.00% |  |
Subsidiaries [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 68.5 | 78.4 |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | 2,100.0 | 1,900.0 |
Accounts Receivable [Member] |  |  |  |
Business Information [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 341.7 | $ 304.9 |

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