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v3.26.1

Notes Payable - Principal Amounts (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Sep. 30, 2025
--- | --- | ---
Estimate of Fair Value Measurement [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, Fair value | $ 6,600.0 | $ 6,000.0
Notes payable | 6,563.8 | 5,965.5
Fair Value, Inputs, Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, Fair value | 3,800.0 | 3,800.0
Fair Value, Inputs, Level 3 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, Fair value | 2,800.0 | 2,200.0
HomeBuildingOps |  |
Debt Instrument [Line Items] |  |
Revolving credit facility | 250.0 | 0.0
Notes payable | 3,427.1 | 3,154.4
Unamortized Debt Issuance Expense | 17.2 | 18.9
HomeBuildingOps | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Notes payable | 201.1 | 180.6
Rental |  |
Debt Instrument [Line Items] |  |
Revolving credit facility | 865.0 | 600.0
Notes payable | 865.0 | 600.0
Financial Services [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | 1,478.2 | 1,408.3
Forestar Group [Member] |  |
Debt Instrument [Line Items] |  |
Revolving credit facility | 0.0 | 0.0
Notes payable | 793.5 | 802.8
Unamortized Debt Issuance Expense | 6.5 | 7.2
Forestar Group [Member] | Secured Debt |  |
Debt Instrument [Line Items] |  |
Notes payable | 0.0 | 9.9
1.3% Senior Notes due 2026 [Member] | HomeBuildingOps |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 599.4 | 598.8
Debt Instrument, Interest Rate, Stated Percentage | 1.30% |
1.4% Senior Notes due 2027 [Member] | HomeBuildingOps |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 498.6 | 498.2
Debt Instrument, Interest Rate, Stated Percentage | 1.40% |
4.85% Senior Notes due 2030 | HomeBuildingOps |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 495.9 | 495.5
Debt Instrument, Interest Rate, Stated Percentage | 4.85% |
5.0% Senior Notes due 2034 [Member] | HomeBuildingOps |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 688.3 | 687.7
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |
5.5% Senior Notes due 2035 [Member] | HomeBuildingOps |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 693.8 | 693.6
Debt Instrument, Interest Rate, Stated Percentage | 5.50% |
5.0% Senior Notes due 2028 [Member] | Forestar Group [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 298.9 | 298.7
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |
6.5% Senior Notes due 2033 [Member] | Forestar Group [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 494.6 | 494.2
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |
Commitments to Extend Credit [Member] | Financial Services [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 1,062.1 | 1,103.5
Warehouse Agreement Borrowings [Member] | Financial Services [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 416.1 | $ 304.8

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