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Investments in Marketable Securities and Unconsolidated Entities - Outstanding Borrowings of Unconsolidated Entities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014
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Schedule of Equity Method Investments [Line Items] |  |
Investments in marketable securities and unconsolidated entities | $ 10,372 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | $ 38,341 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Unconsolidated Entities |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in marketable securities and unconsolidated entities | 10,372 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember | 13,576 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember
Total equity of unconsolidated entities | 36,773 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember | 59,336 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember
Total outstanding borrowings of unconsolidated entities | $ 10,537 bzh_EquityMethodInvestmentSummarizedFinancialInformationBorrowings / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember | $ 11,254 bzh_EquityMethodInvestmentSummarizedFinancialInformationBorrowings / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember

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- Definition Amount of equity, including noncontrolling interest, reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.g) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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