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v3.19.1

Notes Payable - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 01, 2018 | Mar. 31, 2019 | Mar. 31, 2019 | Jun. 30, 2019 | Sep. 30, 2018
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance costs |  | $ 6,800,000 | $ 6,800,000 |  | $ 8,500,000
Notes payable |  | 3,622,400,000 | 3,622,400,000 |  | 3,203,500,000
Outstanding letters of credit |  | 148,300,000 | 148,300,000 |  |
Restricted Cash and Cash Equivalents |  | 32,400,000 | 32,400,000 |  | 32,900,000
Homebuilding [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  | 2,777,200,000 | 2,777,200,000 |  | 2,445,900,000
Borrowing capacity on revolving credit facility |  | 1,325,000,000 | 1,325,000,000 |  |
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 |  |  | 1,000,000,000 |  |
Borrowings outstanding on revolving credit facility |  | $ 750,000,000 | $ 750,000,000 |  | 0
Line of Credit Facility, Interest Rate at Period End |  | 3.70% | 3.70% |  |
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 |  | 9,400,000 | 9,400,000 |  | 8,600,000
Homebuilding [Member] | Senior Note Twenty Nine [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  | 0 | $ 0 |  | 499,600,000
Maturities of Senior Debt |  | $ 500,000,000 |  |  |
Stated interest rate |  | 3.75% | 3.75% |  |
Financial Services [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  | $ 690,700,000 | $ 690,700,000 |  | 637,700,000
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 |  | 7,300,000 | 7,300,000 |  | 8,100,000
Mortgage loans held for sale pledged under repurchase agreement |  | 784,500,000 | 784,500,000 |  |
Mortgage loans held for sale pledged under repurchase agreement, collateral value |  | $ 759,400,000 | $ 759,400,000 |  |
Interest rate on mortgage repurchase facility |  | 4.20% | 4.20% |  |
Forestar Group [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  | $ 149,200,000 | $ 149,200,000 |  | 111,700,000
Borrowing capacity on revolving credit facility |  | 380,000,000 | 380,000,000 |  |
Letter of Credit, Maximum Borrowing Capacity (in dollars) |  | 100,000,000 | 100,000,000 |  |
Maximum borrowing capacity on revolving credit facility |  | $ 570,000,000 | $ 570,000,000 |  |
Letters of credit, sublimit borrowing capacity, as a percentage |  | 50.00% | 50.00% |  |
Line of Credit Facility, Interest Rate at Period End |  | 4.80% | 4.80% |  |
Restricted Cash and Cash Equivalents |  | $ 15,700,000 | $ 15,700,000 |  | 16,200,000
Forestar Group [Member] | 3.75% convertible senior notes due 2020 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 3.75% | 3.75% |  |
Standby Letters of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding letters of credit |  | $ 16,500,000 | $ 16,500,000 |  |
Standby Letters of Credit [Member] | Homebuilding [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding letters of credit |  | 1,500,000 | 1,500,000 |  |
Standby Letters of Credit [Member] | Forestar Group [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding letters of credit |  | 15,000,000 | 15,000,000 |  |
Line of Credit [Member] | Homebuilding [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding letters of credit |  | 128,000,000 | 128,000,000 |  |
Line of Credit [Member] | Forestar Group [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding letters of credit |  | 3,800,000 | 3,800,000 |  |
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 |  |
Segment Reconciling Items [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  | 5,300,000 | 5,300,000 |  | 8,200,000
Restricted Cash and Cash Equivalents |  | $ 0 | $ 0 |  | $ 0
Subsequent Event [Member] | Forestar Group [Member] | Senior Note Member Forty One [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  |  | 8.00% |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 8.50% |
Debt Instrument, Face Amount |  |  |  | $ 350,000,000 |

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