Notes Payable - Principal Amounts (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Notes payable, carrying value	$ 5,917.7	$ 5,094.5
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	2,200.0
Long-term Debt, Maturities, Repayments of Principal in Year Two	910.3
Long-term Debt, Maturities, Repayments of Principal in Year Three	600.4
Long-term Debt, Maturities, Repayments of Principal in Year Four	1,500.0
Long-term Debt, Maturities, Repayments of Principal in Year Five	17.5
Long-Term Debt, Maturity, after Year Five	700.0
Home Building Consolidated
Debt Instrument [Line Items]
Line of credit, amount outstanding	0.0	0.0
Notes payable, carrying value	2,926.8	2,329.9
Unamortized Debt Issuance Expense	11.7	8.4
Home Building Consolidated \| Unsecured Debt
Debt Instrument [Line Items]
Notes payable, carrying value	$ 146.2	239.8
Home Building Consolidated \| SeniorNoteFortyTwo [Member]
Debt Instrument [Line Items]
Senior notes, stated interest rate	2.50%
Notes payable, carrying value	$ 500.0	499.0
Home Building Consolidated \| SeniorNoteFortyFour
Debt Instrument [Line Items]
Senior notes, stated interest rate	2.60%
Notes payable, carrying value	$ 499.0	498.0
Home Building Consolidated \| SeniorNoteFortySIx
Debt Instrument [Line Items]
Senior notes, stated interest rate	1.30%
Notes payable, carrying value	$ 597.7	596.6
Home Building Consolidated \| Senior Note Forty Five [Member]
Debt Instrument [Line Items]
Senior notes, stated interest rate	1.40%
Notes payable, carrying value	$ 497.4	496.5
Home Building Consolidated \| Senior Note Forty Eight
Debt Instrument [Line Items]
Senior notes, stated interest rate	5.00%
Notes payable, carrying value	$ 686.5	0.0
Forestar Group [Member]
Debt Instrument [Line Items]
Line of credit, amount outstanding	0.0	0.0
Notes payable, carrying value	706.4	695.0
Unamortized Debt Issuance Expense	3.5	5.0
Forestar Group [Member] \| Unsecured Debt
Debt Instrument [Line Items]
Notes payable, carrying value	$ 9.9	0.0
Forestar Group [Member] \| Senior Note Forty Seven
Debt Instrument [Line Items]
Senior notes, stated interest rate	3.85%
Notes payable, carrying value	$ 398.4	397.4
Forestar Group [Member] \| Senior Note Member Forty Three
Debt Instrument [Line Items]
Senior notes, stated interest rate	5.00%
Notes payable, carrying value	$ 298.1	297.6
Financial Services [Member]
Debt Instrument [Line Items]
Notes payable, carrying value	1,533.8	1,669.6
Rental
Debt Instrument [Line Items]
Line of credit, amount outstanding	745.0	400.0
Notes payable, carrying value	750.7	400.0
Rental \| Unsecured Debt
Debt Instrument [Line Items]
Notes payable, carrying value	$ 5.7	$ 0.0

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

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: