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Inventory - Summary of Interests in Lot Option Agreements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014
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Real Estate Properties [Line Items] |  |
Deposits and non-refundable preacquisition costs incurred | $ 44,733 bzh_LandUnderPurchaseOptionsDepositsAndNonRefundablePreacquisitionCosts | $ 43,529 bzh_LandUnderPurchaseOptionsDepositsAndNonRefundablePreacquisitionCosts
Remaining obligations | 380,730 bzh_LandUnderPurchaseOptionsConsolidatedAndUnconsolidatedViesTotalRemainingObligationsUnderOptionAgreements | 420,534 bzh_LandUnderPurchaseOptionsConsolidatedAndUnconsolidatedViesTotalRemainingObligationsUnderOptionAgreements
Land not owned under option agreements | 1,443 us-gaap_LandUnderPurchaseOptionsRecorded | 3,857 us-gaap_LandUnderPurchaseOptionsRecorded
Consolidated VIEs |  |
Real Estate Properties [Line Items] |  |
Deposits and non-refundable preacquisition costs incurred | 195 bzh_LandUnderPurchaseOptionsDepositsAndNonRefundablePreacquisitionCosts / dei_LegalEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 941 bzh_LandUnderPurchaseOptionsDepositsAndNonRefundablePreacquisitionCosts / dei_LegalEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Remaining obligations | 1,248 bzh_LandUnderPurchaseOptionsConsolidatedAndUnconsolidatedViesTotalRemainingObligationsUnderOptionAgreements / dei_LegalEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 2,916 bzh_LandUnderPurchaseOptionsConsolidatedAndUnconsolidatedViesTotalRemainingObligationsUnderOptionAgreements / dei_LegalEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Land not owned under option agreements | 1,443 us-gaap_LandUnderPurchaseOptionsRecorded / dei_LegalEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 3,857 us-gaap_LandUnderPurchaseOptionsRecorded / dei_LegalEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Unconsolidated lot option agreements |  |
Real Estate Properties [Line Items] |  |
Deposits and non-refundable preacquisition costs incurred | 44,538 bzh_LandUnderPurchaseOptionsDepositsAndNonRefundablePreacquisitionCosts / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember | 42,588 bzh_LandUnderPurchaseOptionsDepositsAndNonRefundablePreacquisitionCosts / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember
Remaining obligations | 379,482 bzh_LandUnderPurchaseOptionsConsolidatedAndUnconsolidatedViesTotalRemainingObligationsUnderOptionAgreements / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember | 417,618 bzh_LandUnderPurchaseOptionsConsolidatedAndUnconsolidatedViesTotalRemainingObligationsUnderOptionAgreements / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember
Land not owned under option agreements | $ 0 us-gaap_LandUnderPurchaseOptionsRecorded / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember | $ 0 us-gaap_LandUnderPurchaseOptionsRecorded / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember

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- Definition Land Under Purchase Options, Consolidated and Unconsolidated VIEs, Total Remaining Obligations Under Option Agreements + References No definition available. + Details
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Namespace Prefix: | bzh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Land Under Purchase Options, Deposits and Non-refundable Preacquisition Costs + References No definition available. + Details
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Namespace Prefix: | bzh_
Data Type: | xbrli:monetaryItemType
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- Definition The carrying amount as of the balance sheet date of land not owned but under a contract in which the entity has an option to purchase the land. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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- Details
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