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Contingencies - Litigation and Other Matters (Details) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2012 loans homes | Sep. 30, 2011 homes | Sep. 30, 2012 Damages from Product Defects [Member] homes | Sep. 30, 2012 Performance Bonds | Sep. 30, 2012 Letter of Credit | Sep. 30, 2011 Letter of Credit | Sep. 30, 2011 South Edge Settlement Agreement | Sep. 30, 2006 First Order New Jersey Department of Environmental Protection - Violation of Permit | Sep. 30, 2006 Second Order New Jersey Department of Environmental Protection - Violation of Permit
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Company's Liability Under Deferred Prosecution Agreement, Percentage of Company's Adjusted EBITDA | 4.00% |  |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum | $ 55,000,000 |  |  |  |  |  |  |  |
Loss Contingency, Damages Paid, Value | 16,000,000 |  |  |  |  |  |  |  |
Minimum standard product warranty period | 1 year |  |  |  |  |  |  |  |
Maximum standard product warranty period | 2 years |  |  |  |  |  |  |  |
Number of homes that have not accepted Company's offer to repair | 174 | 334 | 2 |  |  |  |  |  |
Amount demanded per the complaint to recover purported losses | 5,000,000 |  |  |  |  |  |  | 630,000 | 678,000
Number of loans involved in lawsuit | 57,000 |  |  |  |  |  |  |  |
Accrued amounts for litigation and other contingent liabilities | 19,400,000 | 30,400,000 |  |  |  |  | 15,700,000 |  |
Letters of credit secured using cash collateral |  |  |  |  | 24,700,000 | 28,900,000 |  |  |
Cash collateral in restricted accounts securing letters of credit |  |  |  | $ 157,000,000 |  |  |  |  |

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