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Contingencies - Litigation and Other Matters (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  | 12 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Mar. 31, 2013 Performance Bonds | Mar. 31, 2013 Letter of Credit | Sep. 30, 2012 Letter of Credit | 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 | Mar. 31, 2013 Pending Litigation loan
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Minimum standard product warranty period |  | 1 year |  |  |  |  |  |  |
Maximum standard product warranty period |  | 2 years |  |  |  |  |  |  |
Company's liability under Deferred Prosecution Agreement (percent) | 4.00% | 4.00% |  |  |  |  |  |  |
Maximum liability under the DPA and other settlement agreements | $ 55,000,000 | $ 55,000,000 |  |  |  |  |  |  |
Portion of liability under DPA that has been paid as of balance sheet date | 16,600,000 |  |  |  |  |  |  |  |
Amount demanded per the complaint to recover purported losses |  |  |  |  |  |  | 630,000 | 678,000 |
Accrued amounts for litigation and other contingent liabilities | 16,000,000 | 16,000,000 | 19,400,000 |  |  |  |  |  |
Letters of credit secured using cash collateral |  |  |  |  | 23,200,000 | 24,700,000 |  |  |
Cash collateral in restricted accounts securing letters of credit |  |  |  | $ 148,300,000 |  |  |  |  |
Number of affected homes that have not accepted Company's offer to repair |  |  |  |  |  |  |  |  | 2

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