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Notes Payable (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Estimate of Fair Value Measurement [Member]    
Debt Instrument [Line Items]    
Notes payable, Fair value $ 5,100.0 $ 4,800.0
Letters of Credit Outstanding, Amount 253.9  
Notes payable 5,290.4 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 2,500.0 2,300.0
Forestar Group [Member]    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Expense 4.6 5.0
Notes payable 705.3 695.0
Financial Services [Member]    
Debt Instrument [Line Items]    
Notes payable 1,279.7 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 24.3  
Line of Credit Facility, Remaining Borrowing Capacity 385.7  
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 705.3 695.0
Home Building Consolidated    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Expense 7.5 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 229.6  
Line of Credit Facility, Remaining Borrowing Capacity 1,960.0  
Authorized Repurchase Of Debt Securities 500.0  
Debt Repurchase Authorization Remaining 500.0  
Notes payable 2,355.4 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 $ 950.0 400.0
Letters of Credit Outstanding, Amount 0.0  
Line of Credit Facility, Remaining Borrowing Capacity 100.0  
Letter of Credit, Maximum Borrowing Capacity (in dollars) 100.0  
Notes payable $ 950.0 400.0
Line of Credit Facility, Interest Rate at Period End 7.20%  
Proceeds from Lines of Credit $ 720.0  
Repayments of Lines of Credit $ 170.0  
SeniorNoteFortyTwo [Member] | Home Building Consolidated    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.50%  
Notes payable $ 499.3 499.0
SeniorNoteFortyFour | Home Building Consolidated    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.60%  
Notes payable $ 498.3 498.0
Senior Note Forty Six | Home Building Consolidated    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.30%  
Notes payable $ 596.9 596.6
Senior Note Forty Five | Home Building Consolidated    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.40%  
Notes payable $ 496.7 496.5
Senior Note Member Forty Six | Forestar Group [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.85%  
Notes payable $ 397.7 397.4
Senior Note Member Forty Three | Forestar Group [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.00%  
Notes payable $ 297.7 297.6
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 264.2 239.8
Commitments to Extend Credit | Financial Services [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Current Borrowing Capacity 2,000.0  
Line of Credit Facility, Maximum Borrowing Capacity 2,300.0  
Deposit Liabilities, Collateral Issued, Financial Instruments 1,820.0  
Participating Mortgage Loans, Mortgage Obligations, Amount $ 1,790.0  
Assets Sold under Agreements to Repurchase, Interest Rate 7.00%  
Notes payable $ 1,160.7 1,373.3
Warehouse Agreement Borrowings | Financial Services [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Current Borrowing Capacity 300.0  
Deposit Liabilities, Collateral Issued, Financial Instruments 127.3  
Participating Mortgage Loans, Mortgage Obligations, Amount $ 121.5  
Assets Sold under Agreements to Repurchase, Interest Rate 6.60%  
Notes payable $ 119.0 $ 296.3