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Contingencies - Litigation and Other Matters (Details) - Credit Facility [Domain] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 63 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014
Loss Contingencies [Line Items] |  |  |
Accrued amounts for litigation and other contingent liabilities | $ 11.9 | $ 11.9 | $ 13.4
Pledged Assets Separately Reported, Securities Pledged for Other Debt Obligations, at Fair Value | $ 217.4 | $ 217.4 |
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 |  |  | $ 22.7
bzh_DeferredProsecutionAgreementAccrual | 4.6 | 4.6 |
Loss Contingency Accrual, Provision | 1.7 | 2.5 |
Performance Bonds |  |  |
Loss Contingencies [Line Items] |  |  |
Letters of credit secured using cash collateral | $ 41.5 | $ 41.5 |

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