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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 $ 1,070,000us-gaap_MarketableSecuritiesUnrealizedGainLoss $ 0us-gaap_MarketableSecuritiesUnrealizedGainLoss $ 1,276,000us-gaap_MarketableSecuritiesUnrealizedGainLoss $ 0us-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 0bzh_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 5,700,000bzh_JointVentureObligation
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bzh_InspiradaMember
  5,700,000bzh_JointVentureObligation
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bzh_InspiradaMember
   
Financial Guarantee          
Schedule of Equity Method Investments [Line Items]          
Guarantor Obligations, Current Carrying Value $ 0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialGuaranteeMember
  $ 0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialGuaranteeMember
  $ 0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialGuaranteeMember