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Inventory - Summary of Interests in Lot Option Agreements (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Real Estate Properties [Line Items]    
Deposits and non-refundable preacquisition costs incurred $ 54,778bzh_LandUnderPurchaseOptionsDepositsAndNonRefundablePreacquisitionCosts $ 43,529bzh_LandUnderPurchaseOptionsDepositsAndNonRefundablePreacquisitionCosts
Remaining obligations 438,441bzh_LandUnderPurchaseOptionsConsolidatedAndUnconsolidatedViesTotalRemainingObligationsUnderOptionAgreements 420,534bzh_LandUnderPurchaseOptionsConsolidatedAndUnconsolidatedViesTotalRemainingObligationsUnderOptionAgreements
Land not owned under option agreements 0us-gaap_LandUnderPurchaseOptionsRecorded 3,857us-gaap_LandUnderPurchaseOptionsRecorded
Consolidated VIEs    
Real Estate Properties [Line Items]    
Deposits and non-refundable preacquisition costs incurred   941bzh_LandUnderPurchaseOptionsDepositsAndNonRefundablePreacquisitionCosts
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Remaining obligations   2,916bzh_LandUnderPurchaseOptionsConsolidatedAndUnconsolidatedViesTotalRemainingObligationsUnderOptionAgreements
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Land not owned under option agreements   3,857us-gaap_LandUnderPurchaseOptionsRecorded
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Unconsolidated lot option agreements    
Real Estate Properties [Line Items]    
Deposits and non-refundable preacquisition costs incurred 54,778bzh_LandUnderPurchaseOptionsDepositsAndNonRefundablePreacquisitionCosts
/ dei_LegalEntityAxis
= bzh_UnconsolidatedEntitiesMember		 42,588bzh_LandUnderPurchaseOptionsDepositsAndNonRefundablePreacquisitionCosts
/ dei_LegalEntityAxis
= bzh_UnconsolidatedEntitiesMember
Remaining obligations 438,441bzh_LandUnderPurchaseOptionsConsolidatedAndUnconsolidatedViesTotalRemainingObligationsUnderOptionAgreements
/ dei_LegalEntityAxis
= bzh_UnconsolidatedEntitiesMember		 417,618bzh_LandUnderPurchaseOptionsConsolidatedAndUnconsolidatedViesTotalRemainingObligationsUnderOptionAgreements
/ dei_LegalEntityAxis
= bzh_UnconsolidatedEntitiesMember
Land not owned under option agreements $ 0us-gaap_LandUnderPurchaseOptionsRecorded
/ dei_LegalEntityAxis
= bzh_UnconsolidatedEntitiesMember		 $ 0us-gaap_LandUnderPurchaseOptionsRecorded
/ dei_LegalEntityAxis
= bzh_UnconsolidatedEntitiesMember