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Contingencies - Litigation and Other Matters (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2016 | Sep. 30, 2015
DPA And HUD |  |  |
Loss Contingencies [Line Items] |  |  |
Company's liability under Deferred Prosecution Agreement (percent) | 4.00% | 4.00% |
Maximum liability under the DPA and other settlement agreements | $ 48.0 | $ 48.0 |
Portion of liability under DPA that has been paid as of balance sheet date |  | 28.1 |
bzh_DeferredProsecutionAgreementAccrual | 4.3 | 4.3 |
Loss Contingency Accrual, Provision | 1.1 | 2.3 |
Legal Reserve |  |  |
Loss Contingencies [Line Items] |  |  |
Accrued amounts for litigation and other contingent liabilities | 9.0 | 9.0 | $ 12.6
Performance Bonds |  |  |
Loss Contingencies [Line Items] |  |  |
Letters of credit secured using cash collateral | 43.2 | 43.2 |
Pledged Assets Separately Reported, Securities Pledged for Other Debt Obligations, at Fair Value | $ 213.7 | $ 213.7 |

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