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Notes Payable - Principal Amounts (Details) - USD ($) $ in Millions	Mar. 31, 2025	Sep. 30, 2024
Estimate of Fair Value Measurement [Member]
Debt Instrument [Line Items]
Notes payable, Fair value	$ 6,500.0	$ 5,900.0
Notes payable	6,518.4	5,917.7
Fair Value, Inputs, Level 2 [Member]
Debt Instrument [Line Items]
Notes payable, Fair value	3,800.0	3,400.0
Fair Value, Inputs, Level 3 [Member]
Debt Instrument [Line Items]
Notes payable, Fair value	2,700.0	2,500.0
Home Building Consolidated
Debt Instrument [Line Items]
Revolving credit facility	0.0	0.0
Notes payable	3,148.5	2,926.8
Unamortized Debt Issuance Expense	16.6	11.7
Home Building Consolidated | Unsecured Debt
Debt Instrument [Line Items]
Notes payable	172.6	146.2
Rental
Debt Instrument [Line Items]
Revolving credit facility	1,050.0	745.0
Notes payable	1,050.0	750.7
Rental | Unsecured Debt
Debt Instrument [Line Items]
Notes payable	0.0	5.7
Forestar Group [Member]
Debt Instrument [Line Items]
Revolving credit facility	0.0	0.0
Notes payable	872.5	706.4
Forestar Group [Member] | Unsecured Debt
Debt Instrument [Line Items]
Notes payable	9.9	9.9
Financial Services [Member]
Debt Instrument [Line Items]
Notes payable	1,447.4	1,533.8
Forestar Group [Member]
Debt Instrument [Line Items]
Notes payable	872.5	706.4
Unamortized Debt Issuance Expense	8.0	3.5
2.5% Senior Notes due 2024 [Member] | Home Building Consolidated
Debt Instrument [Line Items]
Notes payable	$ 0.0	500.0
Debt Instrument, Interest Rate, Stated Percentage	2.50%
2.6% Senior Notes due 2025 [Member] | Home Building Consolidated
Debt Instrument [Line Items]
Notes payable	$ 499.5	499.0
Debt Instrument, Interest Rate, Stated Percentage	2.60%
1.3% Senior Notes due 2026 [Member] | Home Building Consolidated
Debt Instrument [Line Items]
Notes payable	$ 598.2	597.7
Debt Instrument, Interest Rate, Stated Percentage	1.30%
1.4% Senior Notes due 2027 [Member] | Home Building Consolidated
Debt Instrument [Line Items]
Notes payable	$ 497.8	497.4
Debt Instrument, Interest Rate, Stated Percentage	1.40%
5.0% Senior Notes due 2034 [Member] | Home Building Consolidated
Debt Instrument [Line Items]
Notes payable	$ 687.2	686.5
Debt Instrument, Interest Rate, Stated Percentage	5.00%
5.5% Senior Notes due 2035 [Member] | Home Building Consolidated
Debt Instrument [Line Items]
Notes payable	$ 693.2	0.0
Debt Instrument, Interest Rate, Stated Percentage	5.50%
3.85% Senior Notes due 2026 [Member] | Forestar Group [Member]
Debt Instrument [Line Items]
Notes payable	$ 70.4	398.4
Debt Instrument, Interest Rate, Stated Percentage	3.85%
5.0% Senior Notes due 2028 [Member] | Forestar Group [Member]
Debt Instrument [Line Items]
Notes payable	$ 298.4	298.1
Debt Instrument, Interest Rate, Stated Percentage	5.00%
6.5% Senior Notes due 2033 [Member] | Forestar Group [Member]
Debt Instrument [Line Items]
Notes payable	$ 493.8	0.0
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Commitments to Extend Credit [Member] | Financial Services [Member]
Debt Instrument [Line Items]
Notes payable	$ 1,364.9	1,229.3
Warehouse Agreement Borrowings [Member] | Financial Services [Member]
Debt Instrument [Line Items]
Notes payable	$ 82.5	$ 304.5

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