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Notes Payable - Narrative (Details) |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 01, 2018 USD ($) | Aug. 01, 2017 USD ($) | Jun. 30, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) $ / shares | Oct. 05, 2017 USD ($) | Sep. 30, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs |  |  | $ 9,300,000 |  | $ 9,300,000 |  | $ 9,500,000
Notes payable |  |  | 3,093,600,000 |  | 3,093,600,000 |  | 2,871,600,000
Outstanding letters of credit |  |  | 110,000,000 |  | 110,000,000 |  |
Restricted Cash and Cash Equivalents |  |  | 58,700,000 |  | 58,700,000 |  | 16,500,000
Homebuilding [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  |  | 2,447,100,000 |  | 2,447,100,000 |  | 2,451,600,000
Borrowing capacity on revolving credit facility |  |  | 1,275,000,000 |  | 1,275,000,000 |  |
Maximum borrowing capacity on revolving credit facility |  |  | $ 1,900,000,000 |  | $ 1,900,000,000 |  |
Letters of credit, sublimit borrowing capacity, as a percentage |  |  | 50.00% |  | 50.00% |  |
Proceeds from revolving credit facility |  |  |  |  | $ 1,800,000,000 |  |
Repayments of revolving credit facility |  |  |  |  | 1,800,000,000 |  |
Borrowings outstanding on revolving credit facility |  |  | $ 0 |  | 0 |  | 0
Authorized repurchase of debt securities |  | $ 500,000,000 |  |  |  |  |
Debt repurchase program, remaining authorized repurchase amount |  |  | 500,000,000 |  | 500,000,000 |  |
Restricted Cash and Cash Equivalents |  |  | 11,200,000 |  | 11,200,000 |  | 9,300,000
Homebuilding [Member] | 3.625% senior notes due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  |  | $ 0 |  | $ 0 |  | 399,700,000
Early Repayment of Senior Debt |  |  |  | $ 400,000,000 |  |  |
Stated interest rate |  |  | 3.625% | 3.625% | 3.625% |  |
Homebuilding [Member] | 2.55% senior notes due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  |  | $ 397,800,000 |  | $ 397,800,000 |  | 0
Debt Instrument, Face Amount |  |  |  | $ 400,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 2.80% |  |  |
Stated interest rate |  |  | 2.55% | 2.55% | 2.55% |  |
Financial Services [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  |  | $ 526,300,000 |  | $ 526,300,000 |  | 420,000,000
Borrowing capacity on revolving credit facility |  |  | 600,000,000 |  | 600,000,000 |  |
Maximum borrowing capacity on revolving credit facility |  |  | 1,000,000,000 |  | 1,000,000,000 |  |
Restricted Cash and Cash Equivalents |  |  | 7,500,000 |  | 7,500,000 |  | $ 7,200,000
Mortgage loans held for sale pledged under repurchase agreement |  |  | 639,400,000 |  | 639,400,000 |  |
Mortgage loans held for sale pledged under repurchase agreement, collateral value |  |  | 619,800,000 |  | 619,800,000 |  |
Advance pay downs on mortgage repurchase facility |  |  | $ 93,500,000 |  | $ 93,500,000 |  |
Interest rate on mortgage repurchase facility |  |  | 3.90% |  | 3.90% |  |
Forestar Group [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  |  | $ 110,500,000 |  | $ 110,500,000 |  |
Borrowing capacity on revolving credit facility |  |  | 30,000,000 |  | 30,000,000 | $ 50,000,000 |
Letter of Credit, Maximum Borrowing Capacity (in dollars) |  |  |  |  |  | 50,000,000 |
Outstanding letters of credit |  |  | 21,500,000 |  | 21,500,000 |  |
Restricted Cash and Cash Equivalents |  |  | $ 40,000,000 |  | $ 40,000,000 |  |
Forestar Group [Member] | 3.75% convertible senior notes due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 120,000,000 |
Early Repayment of Senior Debt |  |  |  | $ 1,100,000 |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  | 0.00817192 | 0.0408351 |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  | $ 579.77062 |  | $ 579.77062 |  |
Stated interest rate |  |  | 3.75% |  | 3.75% |  |
Line of Credit [Member] | Homebuilding [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Outstanding letters of credit |  |  | $ 87,100,000 |  | $ 87,100,000 |  |
Weighted Average [Member] | Financial Services [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowing capacity on revolving credit facility |  |  | 725,000,000 |  | 725,000,000 |  |
Maximum [Member] | Financial Services [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowing capacity on revolving credit facility |  |  | 800,000,000 |  | 800,000,000 |  |
Subsequent Event [Member] | Homebuilding [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Authorized repurchase of debt securities | $ 500,000,000 |  |  |  |  |  |
Segment Reconciling Items [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  |  | 9,700,000 |  | 9,700,000 |  |
Restricted Cash and Cash Equivalents |  |  | $ 0 |  | $ 0 |  |

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