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Contingencies - Narrative (Details) $ in Thousands | 12 Months Ended | 39 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) home | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2017 USD ($) home | Sep. 30, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Limited product warranty length | 10 years |  |  |  |
Accrued warranty expenses | $ 18,091 | $ 39,131 | $ 27,681 | $ 18,091 | $ 16,084
Insurance recoveries | 4,800 | 59,300 |  |  |
Excess insurance recovery |  | 3,600 |  |  |
Accrued amounts for litigation and other contingent liabilities | 3,900 | 10,200 |  | 3,900 |
DPA Liability |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Damages paid | 33,500 |  |  |  |
Expense related to DPA and HUD agreements |  | 4,900 | $ 5,300 |  |
Specific Warranty Issue |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Product warranty expense |  |  |  | 85,600 |
Specific Warranty Issue | Florida |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Product warranty expense | 5,200 | 48,000 |  |  |
Accrued warranty expenses | $ 4,700 | 22,600 |  | $ 4,700 |
Numer of homes likely to require more than minor repairs | home | 710 |  |  | 710 |
Change on number of homes likely to be repaired | home | 20 |  |  |  |
Number of homes that have been repaired | home | 640 |  |  | 640 |
Accrued product warranty, decrease for payments | $ 23,100 |  |  |  |
Estimated remaining warranty costs | 2,500 |  |  | $ 2,500 |
Performance Bonds |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Letters of credit secured using cash collateral | 45,500 |  |  | 45,500 |
Cash collateral in restricted accounts securing letters of credit | 200,600 |  |  | 200,600 |
Land Option Contracts |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Letters of credit secured using cash collateral | $ 11,000 |  |  | $ 11,000 |
Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Standard product warranty period | 1 year |  |  |  |
Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Standard product warranty period | 2 years |  |  |  |
Settled Litigation | Insurance Settlement |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Insurance recoveries |  | $ 15,500 |  |  |

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