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Notes Payable (Tables) | 12 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Summary of notes payable at principal amounts, net of unamortized discounts | The Company’s notes payable at their carrying amounts consist of the following:
| September 30,
| 2025 |  | 2024
| (In millions)
Homebuilding |  |  |
Revolving credit facility | $ | — |  |  | $ | — |
2.5% senior notes due 2024 | — |  |  | 500.0 |
2.6% senior notes due 2025 | — |  |  | 499.0 |
1.3% senior notes due 2026 (1) | 598.8 |  |  | 597.7 |
1.4% senior notes due 2027 (1) | 498.2 |  |  | 497.4 |
4.85% senior notes due 2030 (1) | 495.5 |  |  | — |
5.0% senior notes due 2034 (1) | 687.7 |  |  | 686.5 |
5.5% senior notes due 2035 (1) | 693.6 |  |  | — |
Other notes | 180.6 |  |  | 146.2 |
| 3,154.4 |  |  | 2,926.8 |
Rental |  |  |
Revolving credit facility | 600.0 |  |  | 745.0 |
Other notes | — |  |  | 5.7 |
| 600.0 |  |  | 750.7 |
Forestar |  |  |
Revolving credit facility | — |  |  | — |
3.85% senior notes due 2026 | — |  |  | 398.4 |
5.0% senior notes due 2028 (2) | 298.7 |  |  | 298.1 |
6.5% senior notes due 2033 (2) | 494.2 |  |  | — |
Other notes | 9.9 |  |  | 9.9 |
| 802.8 |  |  | 706.4 |
Financial Services |  |  |
Mortgage repurchase facilities: |  |  |
Committed facility | 1,103.5 |  |  | 1,229.3 |
Uncommitted facility | 304.8 |  |  | 304.5 |
| 1,408.3 |  |  | 1,533.8 |
Total notes payable | $ | 5,965.5 |  |  | $ | 5,917.7 |
_______________ (1)Debt issuance costs that were deducted from the carrying amounts of the homebuilding senior notes totaled $18.9 million and $11.7 million at September 30, 2025 and 2024, respectively. (2)Debt issuance costs that were deducted from the carrying amount of Forestar’s senior notes totaled $7.2 million and $3.5 million at September 30, 2025 and 2024, respectively.
Schedule of Maturities of Long-term Debt [Table Text Block] | The key terms of the Company’s homebuilding senior notes outstanding as of September 30, 2025 are summarized below.
Notes Payable |  | Principal Amount |  | Date Issued |  | Date Due |  | Redeemable Prior to Maturity (1) |  | Effective Interest Rate (2)
|  | (In millions) |  |  |  |  |  |  |  |
1.3% senior notes |  | $600 |  | August 2021 |  | October 15, 2026 |  | Yes |  | 1.5%
1.4% senior notes |  | $500 |  | October 2020 |  | October 15, 2027 |  | Yes |  | 1.6%
4.85% senior notes |  | $500 |  | May 2025 |  | October 15, 2030 |  | Yes |  | 5.1%
5.0% senior notes |  | $700 |  | August 2024 |  | October 15, 2034 |  | Yes |  | 5.2%
5.5% senior notes |  | $700 |  | February 2025 |  | October 15, 2035 |  | Yes |  | 5.6%
_______________ (1)The Company may redeem the notes in whole at any time or in part from time to time, at a redemption price equal to the greater of 100% of their principal amount or the present value of the remaining scheduled payments discounted to the redemption date, plus accrued and unpaid interest. The 1.3% senior notes and the 4.85% senior notes are redeemable at a redemption price of 100% of their principal amount, plus accrued and unpaid interest, on or after the date that is one month prior to the final maturity date of the notes. The 1.4% senior notes are redeemable at a redemption price of 100% of their principal amount, plus accrued and unpaid interest, on or after the date that is two months prior to the final maturity of the notes. The 5.0% senior notes and the 5.5% senior notes are redeemable at a redemption price of 100% of their principal amount, plus accrued and unpaid interest, on or after the date that is three months prior to the final maturity of the notes. (2)Interest is payable semi-annually on each of the series of senior notes. The annual effective interest rate is calculated after giving effect to the amortization of debt issuance costs and the discount, if applicable.
Summary of notes payable terms | The key terms of the Company’s homebuilding senior notes outstanding as of September 30, 2025 are summarized below.
Notes Payable |  | Principal Amount |  | Date Issued |  | Date Due |  | Redeemable Prior to Maturity (1) |  | Effective Interest Rate (2)
|  | (In millions) |  |  |  |  |  |  |  |
1.3% senior notes |  | $600 |  | August 2021 |  | October 15, 2026 |  | Yes |  | 1.5%
1.4% senior notes |  | $500 |  | October 2020 |  | October 15, 2027 |  | Yes |  | 1.6%
4.85% senior notes |  | $500 |  | May 2025 |  | October 15, 2030 |  | Yes |  | 5.1%
5.0% senior notes |  | $700 |  | August 2024 |  | October 15, 2034 |  | Yes |  | 5.2%
5.5% senior notes |  | $700 |  | February 2025 |  | October 15, 2035 |  | Yes |  | 5.6%
_______________ (1)The Company may redeem the notes in whole at any time or in part from time to time, at a redemption price equal to the greater of 100% of their principal amount or the present value of the remaining scheduled payments discounted to the redemption date, plus accrued and unpaid interest. The 1.3% senior notes and the 4.85% senior notes are redeemable at a redemption price of 100% of their principal amount, plus accrued and unpaid interest, on or after the date that is one month prior to the final maturity date of the notes. The 1.4% senior notes are redeemable at a redemption price of 100% of their principal amount, plus accrued and unpaid interest, on or after the date that is two months prior to the final maturity of the notes. The 5.0% senior notes and the 5.5% senior notes are redeemable at a redemption price of 100% of their principal amount, plus accrued and unpaid interest, on or after the date that is three months prior to the final maturity of the notes. (2)Interest is payable semi-annually on each of the series of senior notes. The annual effective interest rate is calculated after giving effect to the amortization of debt issuance costs and the discount, if applicable.
Schedule of maturities in long term debt | The key terms of Forestar’s senior notes are summarized below.
Notes Payable |  | Principal Amount |  | Date Issued |  | Date Due |  | Redeemable Prior to Maturity (1) |  | Effective Interest Rate (2)
|  | (In millions) |  |  |  |  |  |  |  |
5.0% senior notes |  | $300 |  | February 2020 |  | March 1, 2028 |  | Yes |  | 5.2%
6.5% senior notes |  | $500 |  | March 2025 |  | March 15, 2033 |  | Yes |  | 6.7%
_______________ (1)Forestar’s senior notes may be redeemed prior to maturity, subject to certain limitations and premiums defined in the indenture agreements. (2)Interest is payable semi-annually on each of the series of senior notes. The annual effective interest rate is calculated after giving effect to the amortization of debt issuance costs.

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