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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Commitments and Contingencies [Abstract] |  |  |  |
Liabilities for various claims, complaints and other legal actions | $ 407,800 | $ 453,500 | $ 420,600 | $ 423,500
Construction defect portion of loss contingency accrual, percentage | 99.00% |  | 98.00% |
Expenses related to legal claims | $ 47,500 | 80,600 |  |
Estimated insurance recoveries related to legal claims | 56,000 | $ 82,600 | $ 74,400 |
Earnest money deposits | 345,500 |  |  |
Remaining purchase price of land under option contracts | 5,800,000 |  |  |
Surety bonds | 1,300,000 |  |  |
Outstanding letters of credit | 110,000 |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Earnest money deposits | 281,600 |  | $ 222,900 |
Option Contracts Subject to Specific Performance Clauses [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Remaining purchase price of land under option contracts | 74,800 |  |  |
Cash [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Earnest money deposits | 341,300 |  |  |
Notes Payable, Other Payables [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Earnest money deposits | 4,200 |  |  |
Forestar Consolidated [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Earnest money deposits | 38,400 |  |  |
Remaining purchase price of land under option contracts | 402,000 |  |  |
Forestar Consolidated [Member] | Option Contracts Subject to Specific Performance Clauses [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Remaining purchase price of land under option contracts | 34,700 |  |  |
Homebuilding [Member] | Line of Credit [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Outstanding letters of credit | 87,100 |  |  |
Homebuilding [Member] | Standby Letters of Credit [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Outstanding letters of credit | 1,400 |  |  |
Forestar Group [Member] |  |  |  |
Commitments and Contingencies [Abstract] |  |  |  |
Earnest money deposits | 3,900 |  |  |
Remaining purchase price of land under option contracts | 59,300 |  |  |
Outstanding letters of credit | $ 21,500 |  |  |

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- Definition A deposit made by a purchaser of real estate to evidence good faith. It is customary for a buyer to give the seller earnest money at the time a sales contract is signed. The earnest money generally is credited to the down payment at closing, which is applied at closing as a component of payment against the purchase price. + References No definition available. + Details
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