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v3.25.3

Notes Payable - Principal Amounts (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Debt Instrument [Line Items] |  |
Notes payable, carrying value | $ 5,965.5 | $ 5,917.7
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 1,600.0 |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 604.7 |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 1,400.0 |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 17.5 |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 0.0 |
Long-Term Debt, Maturity, after Year Five | 2,400.0 |
Home Building Consolidated |  |
Debt Instrument [Line Items] |  |
Line of credit, amount outstanding | 0.0 | 0.0
Notes payable, carrying value | 3,154.4 | 2,926.8
Unamortized Debt Issuance Expense | 18.9 | 11.7
Home Building Consolidated | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Notes payable, carrying value | $ 180.6 | 146.2
Home Building Consolidated | 2.5% Senior Notes due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes, stated interest rate | 2.50% |
Notes payable, carrying value | $ 0.0 | 500.0
Home Building Consolidated | 2.6% Senior Notes due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes, stated interest rate | 2.60% |
Notes payable, carrying value | $ 0.0 | 499.0
Home Building Consolidated | 1.3% Senior Notes due 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes, stated interest rate | 1.30% |
Notes payable, carrying value | $ 598.8 | 597.7
Home Building Consolidated | 1.4% Senior Notes due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes, stated interest rate | 1.40% |
Notes payable, carrying value | $ 498.2 | 497.4
Home Building Consolidated | 4.85% Senior Notes due 2030 |  |
Debt Instrument [Line Items] |  |
Senior notes, stated interest rate | 4.85% |
Notes payable, carrying value | $ 495.5 | 0.0
Home Building Consolidated | 5.0% Senior Notes due 2034 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes, stated interest rate | 5.00% |
Notes payable, carrying value | $ 687.7 | 686.5
Home Building Consolidated | 5.5% Senior Notes due 2035 |  |
Debt Instrument [Line Items] |  |
Senior notes, stated interest rate | 5.50% |
Notes payable, carrying value | $ 693.6 | 0.0
Forestar Group [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit, amount outstanding | 0.0 | 0.0
Notes payable, carrying value | 802.8 | 706.4
Unamortized Debt Issuance Expense | 7.2 | 3.5
Forestar Group [Member] | Secured Debt |  |
Debt Instrument [Line Items] |  |
Notes payable, carrying value | $ 9.9 | 9.9
Forestar Group [Member] | 3.85% Senior Notes due 2026 |  |
Debt Instrument [Line Items] |  |
Senior notes, stated interest rate | 3.85% |
Notes payable, carrying value | $ 0.0 | 398.4
Forestar Group [Member] | 5.0% Senior Notes due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes, stated interest rate | 5.00% |
Notes payable, carrying value | $ 298.7 | 298.1
Forestar Group [Member] | 6.5% Senior Notes due 2033 |  |
Debt Instrument [Line Items] |  |
Senior notes, stated interest rate | 6.50% |
Notes payable, carrying value | $ 494.2 | 0.0
Financial Services [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, carrying value | 1,408.3 | 1,533.8
Financial Services [Member] | Commitments to Extend Credit |  |
Debt Instrument [Line Items] |  |
Notes payable, carrying value | 1,103.5 | 1,229.3
Financial Services [Member] | Warehouse Agreement Borrowings |  |
Debt Instrument [Line Items] |  |
Notes payable, carrying value | 304.8 | 304.5
Rental |  |
Debt Instrument [Line Items] |  |
Line of credit, amount outstanding | 600.0 | 745.0
Notes payable, carrying value | 600.0 | 750.7
Rental | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Notes payable, carrying value | $ 0.0 | $ 5.7

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