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

Contractual interest rate for funds borrowed, under the debt agreement.

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