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Contingencies - Litigation and Other Matters (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015
DPA And HUD |  |
Loss Contingencies [Line Items] |  |
Company's liability under Deferred Prosecution Agreement (percent) | 4.00% |
Maximum liability under the DPA and other settlement agreements | $ 48.0 |
Portion of liability under DPA that has been paid as of balance sheet date | 28.1 |
bzh_DeferredProsecutionAgreementAccrual | 8.6 |
Loss Contingency Accrual, Provision | 1.2 |
Legal Reserve |  |
Loss Contingencies [Line Items] |  |
Accrued amounts for litigation and other contingent liabilities | 13.6 | $ 12.6
Performance Bonds |  |
Loss Contingencies [Line Items] |  |
Letters of credit secured using cash collateral | 43.2 |
Pledged Assets Separately Reported, Securities Pledged for Other Debt Obligations, at Fair Value | $ 188.6 |

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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