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Supplemental Cash Flow Information - Supplemental Disclosure of Non-cash Activity (Details) (USD $) | 6 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Supplemental disclosure of non-cash activity: |  |
Decrease in obligations related to land not owned under option agreements | $ (2,916,000)bzh_IncreaseDecreaseInObligationsRelatedToLandNotOwnedUnderOptionAgreements | $ (1,486,000)bzh_IncreaseDecreaseInObligationsRelatedToLandNotOwnedUnderOptionAgreements
Increase (Decrease) in Debt due to Conversion of Convertible Debt and Tangible Equity for Common Stock | 0 bzh_IncreaseDecreaseInDebtDueToConversionOfConvertibleDebtAndTangibleEquityForCommonStock | (2,376,000)bzh_IncreaseDecreaseInDebtDueToConversionOfConvertibleDebtAndTangibleEquityForCommonStock
Land acquisitions for debt | 12,904,000 bzh_NonCashLandAcquisitions | 16,833,000 bzh_NonCashLandAcquisitions
Supplemental disclosure of cash activity: |  |
Interest payments | 59,702,000 us-gaap_InterestPaid | 60,396,000 us-gaap_InterestPaid
Income tax payments | 98,000 us-gaap_IncomeTaxesPaid | 103,000 us-gaap_IncomeTaxesPaid
Non-cash seller financing | 7,800,000 bzh_NoncashLandAcquisitionsNoncashSellerFinancing |
Lot takedowns | $ 5,100,000 bzh_NoncashLandAcquisitionsLotTakedownCosts |

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- Definition Increase (Decrease) in Debt due to Conversion of Convertible Debt and Tangible Equity for Common Stock + References No definition available. + Details
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