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Notes Payable (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Sep. 30, 2023
Estimate of Fair Value Measurement [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, Fair value | $ 5,800.0 | $ 4,800.0
Letters of Credit Outstanding, Amount | 241.7 |
Notes payable | 5,937.9 | 5,094.5
Fair Value, Inputs, Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, Fair value | 2,600.0 | 2,500.0
Fair Value, Inputs, Level 3 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, Fair value | 3,200.0 | 2,300.0
Forestar Group [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense | 4.2 | 5.0
Notes payable | 705.7 | 695.0
Financial Services [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | 1,884.0 | 1,669.6
Forestar Group [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | 410.0 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 600.0 |
Letters of credit, sublimit borrowing capacity, as a percentage | 50.00% |
Revolving credit facility | $ 0.0 | 0.0
Letters of Credit Outstanding, Amount | 28.0 |
Line of Credit Facility, Remaining Borrowing Capacity | 382.0 |
Authorized Repurchase Of Debt Securities | 30.0 |
Debt Repurchase Authorization Remaining | 30.0 |
Letter of Credit, Maximum Borrowing Capacity (in dollars) | 100.0 |
Notes payable | 705.7 | 695.0
Home Building Consolidated |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense | 6.7 | 8.4
Line of Credit Facility, Current Borrowing Capacity | 2,190.0 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 3,000.0 |
Letters of credit, sublimit borrowing capacity, as a percentage | 100.00% |
Revolving credit facility | $ 0.0 | 0.0
Letters of Credit Outstanding, Amount | 213.7 |
Line of Credit Facility, Remaining Borrowing Capacity | 1,980.0 |
Authorized Repurchase Of Debt Securities | 500.0 |
Debt Repurchase Authorization Remaining | 500.0 |
Notes payable | 2,363.2 | 2,329.9
Rental |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | 1,050.0 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,000.0 |
Letters of credit, sublimit borrowing capacity, as a percentage | 50.00% |
Revolving credit facility | $ 985.0 | 400.0
Letters of Credit Outstanding, Amount | 0.0 |
Line of Credit Facility, Remaining Borrowing Capacity | 65.0 |
Letter of Credit, Maximum Borrowing Capacity (in dollars) | 100.0 |
Notes payable | $ 985.0 | 400.0
Line of Credit Facility, Interest Rate at Period End | 7.40% |
Proceeds from Lines of Credit | $ 985.0 |
Repayments of Lines of Credit | $ 400.0 |
SeniorNoteFortyTwo [Member] | Home Building Consolidated |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.50% |
Notes payable | $ 499.5 | 499.0
SeniorNoteFortyFour | Home Building Consolidated |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.60% |
Notes payable | $ 498.5 | 498.0
Senior Note Forty Six | Home Building Consolidated |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.30% |
Notes payable | $ 597.1 | 596.6
Senior Note Forty Five | Home Building Consolidated |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.40% |
Notes payable | $ 496.9 | 496.5
Senior Note Member Forty Six | Forestar Group [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.85% |
Notes payable | $ 397.9 | 397.4
Senior Note Member Forty Three | Forestar Group [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |
Notes payable | $ 297.9 | 297.6
Secured Debt [Member] | Forestar Group [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | 9.9 | 0.0
Secured Debt [Member] | Home Building Consolidated |  |
Debt Instrument [Line Items] |  |
Notes payable | 271.2 | 239.8
Commitments to Extend Credit | Financial Services [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | 1,600.0 |
Line of Credit Facility, Maximum Borrowing Capacity | 2,000.0 |
Deposit Liabilities, Collateral Issued, Financial Instruments | 2,170.0 |
Participating Mortgage Loans, Mortgage Obligations, Amount | $ 2,120.0 |
Assets Sold under Agreements to Repurchase, Interest Rate | 7.00% |
Notes payable | $ 1,390.3 | 1,373.3
Warehouse Agreement Borrowings | Financial Services [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | 500.0 |
Deposit Liabilities, Collateral Issued, Financial Instruments | 540.4 |
Participating Mortgage Loans, Mortgage Obligations, Amount | $ 511.0 |
Assets Sold under Agreements to Repurchase, Interest Rate | 6.50% |
Notes payable | $ 493.7 | $ 296.3

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