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Investments in Marketable Securities and Unconsolidated Entities - Narrative (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Change in unrealized loss related to available-for-sale securities | $ 1,070,000 us-gaap_MarketableSecuritiesUnrealizedGainLoss | $ 0 us-gaap_MarketableSecuritiesUnrealizedGainLoss | $ 1,276,000 us-gaap_MarketableSecuritiesUnrealizedGainLoss | $ 0 us-gaap_MarketableSecuritiesUnrealizedGainLoss |
Comprehensive loss | (926,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (7,971,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (23,060,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (13,109,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax |
Equity Method Investments, Impairment Of Unconsolidated Entity Investments, Continuing Operations | 0 bzh_EquityMethodInvestmentsImpairmentOfUnconsolidatedEntityInvestmentsContinuingOperations |  |  |  |
Inspirada |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Settlement of unconsolidated entity debt obligation |  |  |  |  | (1,000,000)bzh_SettlementOfUnconsolidatedJvDebtObligation / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bzh_InspiradaMember
Joint Venture Obligation | 5,700,000 bzh_JointVentureObligation / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bzh_InspiradaMember |  | 5,700,000 bzh_JointVentureObligation / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bzh_InspiradaMember |  |
Financial Guarantee |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Guarantor Obligations, Current Carrying Value | $ 0 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember |  | $ 0 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember |  | $ 0 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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