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Supplemental Cash Flow Information - Supplemental Disclosure of Non-cash Activity (Details) (USD $)
 6 Months Ended
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 0bzh_IncreaseDecreaseInDebtDueToConversionOfConvertibleDebtAndTangibleEquityForCommonStock (2,376,000)bzh_IncreaseDecreaseInDebtDueToConversionOfConvertibleDebtAndTangibleEquityForCommonStock
Land acquisitions for debt 12,904,000bzh_NonCashLandAcquisitions 16,833,000bzh_NonCashLandAcquisitions
Supplemental disclosure of cash activity:    
Interest payments 59,702,000us-gaap_InterestPaid 60,396,000us-gaap_InterestPaid
Income tax payments 98,000us-gaap_IncomeTaxesPaid 103,000us-gaap_IncomeTaxesPaid
Non-cash seller financing 7,800,000bzh_NoncashLandAcquisitionsNoncashSellerFinancing  
Lot takedowns $ 5,100,000bzh_NoncashLandAcquisitionsLotTakedownCosts