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v3.25.2

Notes Payable - Principal Amounts (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Estimate of Fair Value Measurement [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, Fair value | $ 7,200.0 | $ 5,900.0
Notes payable | 7,248.7 | 5,917.7
Fair Value, Inputs, Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, Fair value | 4,300.0 | 3,400.0
Fair Value, Inputs, Level 3 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, Fair value | 2,900.0 | 2,500.0
Home Building Consolidated |  |
Debt Instrument [Line Items] |  |
Revolving credit facility | 0.0 | 0.0
Notes payable | 3,651.7 | 2,926.8
Unamortized Debt Issuance Expense | 20.0 | 11.7
Home Building Consolidated | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Notes payable | 179.2 | 146.2
Rental |  |
Debt Instrument [Line Items] |  |
Revolving credit facility | 1,020.0 | 745.0
Notes payable | 1,020.0 | 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 | 872.8 | 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 | 1,704.2 | 1,533.8
Forestar Group [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | 872.8 | 706.4
Unamortized Debt Issuance Expense | 7.6 | 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 | $ 499.7 | 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 | $ 598.5 | 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 | $ 498.0 | 497.4
Debt Instrument, Interest Rate, Stated Percentage | 1.40% |
4.85% Senior Notes due 2030 | Home Building Consolidated |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 495.4 | 0.0
Debt Instrument, Interest Rate, Stated Percentage | 4.85% |
5.0% Senior Notes due 2034 [Member] | Home Building Consolidated |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 687.5 | 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 | $ 693.4 | 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 | $ 298.5 | 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 | $ 494.0 | 0.0
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |
Commitments to Extend Credit [Member] | Financial Services [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 1,252.5 | 1,229.3
Warehouse Agreement Borrowings [Member] | Financial Services [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 451.7 | $ 304.5

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