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Contingencies - Warranty (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 21 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) home | Mar. 31, 2015 USD ($) | Mar. 31, 2016 USD ($) home | Mar. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) Community | Mar. 31, 2016 USD ($) home
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Standard product warranty length, minimum |  |  | 1 year |  |  |  |
Standard product warranty length, maximum |  |  | 2 years |  |  |  |
Limited product warranty length |  |  | 5 years |  |  |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | $ 28,913,000 | $ 27,227,000 | $ 27,681,000 | $ 16,084,000 | $ 16,084,000 |  |
Accruals for warranties issued | 3,086,000 | 1,630,000 | 5,701,000 | 3,155,000 |  |  |
Changes in liability related to warranties existing in prior periods | 20,053,000 | 6,524,000 | 30,653,000 | 20,754,000 |  |  |
Payments made | (11,149,000) | (6,587,000) | (23,132,000) | (11,199,000) |  |  |
Balance at end of period | 40,903,000 | 28,794,000 | 40,903,000 | 28,794,000 | 27,681,000 | $ 16,084,000 | $ 40,903,000
Insurance Recoveries | 19,800,000 |  | 36,200,000 | 5,700,000 |  |  | 55,100,000
InsuranceReceivableNet | 27,800,000 |  | 27,800,000 |  |  |  | 27,800,000
Excess Insurance Recovery |  |  | 3,600,000 |  |  |  |
Specific Warranty Issue |  |  |  |  |  |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |  |  |
Product warranty expense |  |  |  |  |  |  | 61,000,000
Specific Warranty Issue | FLORIDA |  |  |  |  |  |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  |  | 14,500,000 |  |  |  |
Balance at end of period | 26,300,000 |  | 26,300,000 |  | 14,500,000 |  | 26,300,000
Product warranty expense | $ 19,600,000 | $ 4,300,000 | $ 28,600,000 | $ 17,900,000 | $ 26,300,000 | 4,300,000 | $ 59,200,000
Homes likely to require more than minor repairs | home | 680 |  | 680 |  |  |  | 680
Movement on Number of Homes Likely to be Repaired | home | 148 |  |  |  |  |  |
Homes Have Been Repaired | home | 279 |  | 279 |  |  |  | 279
Product warranty accrual, payments | $ 8,000,000 |  | $ 16,800,000 |  |  |  |
Estimated Remaining Warranty Costs | 7,000,000 |  | 7,000,000 |  |  |  | $ 7,000,000
Specific Warranty Issue | NEW JERSEY |  |  |  |  |  |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |  |  |
Product warranty expense | $ 300,000 |  | $ 1,200,000 |  |  | $ 600,000 | $ 1,800,000
Number of Communities With Water Intrusion Issues |  |  | 2 |  |  | 1 |

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