Notes Payable - Principal Amounts (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Notes payable, carrying value	$ 5,094.5	$ 6,066.9
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	1,900.0
Long-term Debt, Maturities, Repayments of Principal in Year Two	522.7
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,300.0
Long-term Debt, Maturities, Repayments of Principal in Year Four	607.2
Long-term Debt, Maturities, Repayments of Principal in Year Five	800.0
Long-Term Debt, Maturity, after Year Five	0.0
Home Building Consolidated
Debt Instrument [Line Items]
Line of credit, amount outstanding	0.0	0.0
Notes payable, carrying value	2,329.9	2,942.6
Unamortized Debt Issuance Expense	8.4	12.2
Home Building Consolidated \| Secured Debt [Member]
Debt Instrument [Line Items]
Notes payable, carrying value	$ 239.8	156.6
Home Building Consolidated \| Senior Note Twenty Seven [Member]
Debt Instrument [Line Items]
Senior notes, stated interest rate	4.75%
Notes payable, carrying value	$ 0.0	299.9
Home Building Consolidated \| SeniorNoteTwentyEight [Member]
Debt Instrument [Line Items]
Senior notes, stated interest rate	5.75%
Notes payable, carrying value	$ 0.0	399.6
Home Building Consolidated \| SeniorNoteFortyTwo [Member]
Debt Instrument [Line Items]
Senior notes, stated interest rate	2.50%
Notes payable, carrying value	$ 499.0	498.2
Home Building Consolidated \| SeniorNoteFortyFour
Debt Instrument [Line Items]
Senior notes, stated interest rate	2.60%
Notes payable, carrying value	$ 498.0	497.1
Home Building Consolidated \| SeniorNoteFortySIx
Debt Instrument [Line Items]
Senior notes, stated interest rate	1.30%
Notes payable, carrying value	$ 596.6	595.5
Home Building Consolidated \| Senior Note Forty Five [Member]
Debt Instrument [Line Items]
Senior notes, stated interest rate	1.40%
Notes payable, carrying value	$ 496.5	495.7
Forestar Group [Member]
Debt Instrument [Line Items]
Line of credit, amount outstanding	0.0	0.0
Notes payable, carrying value	695.0	706.0
Unamortized Debt Issuance Expense	5.0	6.5
Forestar Group [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Notes payable, carrying value	$ 0.0	12.5
Forestar Group [Member] \| Senior Note Forty Seven
Debt Instrument [Line Items]
Senior notes, stated interest rate	3.85%
Notes payable, carrying value	$ 397.4	396.5
Forestar Group [Member] \| Senior Note Member Forty Three
Debt Instrument [Line Items]
Senior notes, stated interest rate	5.00%
Notes payable, carrying value	$ 297.6	297.0
Financial Services [Member]
Debt Instrument [Line Items]
Notes payable, carrying value	1,669.6	1,618.3
Rental
Debt Instrument [Line Items]
Line of credit, amount outstanding	400.0	800.0
Notes payable, carrying value	$ 400.0	$ 800.0

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

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