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Inventory - Recoverability Schedule of Inventory Assets Held for Development, by Reportable Segment (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2015 home Community | Mar. 31, 2014 property | Mar. 31, 2015 home | Mar. 31, 2014 property
Real Estate Properties [Line Items] |  |  |  |
Number of Communities on Watch List | 1 bzh_NumberOfCommunitiesOnWatchList | 4 bzh_NumberOfCommunitiesOnWatchList | 1 bzh_NumberOfCommunitiesOnWatchList | 4 bzh_NumberOfCommunitiesOnWatchList
Undiscounted Cash Flow Analysis Prepared for Number of Communities | 0 bzh_UndiscountedCashFlowAnalysisPreparedForNumberOfCommunities | 1 bzh_UndiscountedCashFlowAnalysisPreparedForNumberOfCommunities |  |
Undiscounted Cash Flow Analysis, Aggregate Undiscounted Cash Flow, Percentage of Book Value |  | 0.00%bzh_UndiscountedCashFlowAnalysisAggregateUndiscountedCashFlowPercentageOfBookValue |  |
West Segment |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of Communities on Watch List | 1 bzh_NumberOfCommunitiesOnWatchList / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember | 1 bzh_NumberOfCommunitiesOnWatchList / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember |  |
Undiscounted Cash Flow Analysis Prepared for Number of Communities | 0 bzh_UndiscountedCashFlowAnalysisPreparedForNumberOfCommunities / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember | 0 bzh_UndiscountedCashFlowAnalysisPreparedForNumberOfCommunities / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember |  |
Undiscounted Cash Flow Analysis, Pre-analysis Book Value | 0 bzh_UndiscountedCashFlowAnalysisPreAnalysisBookValue / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember | 0 bzh_UndiscountedCashFlowAnalysisPreAnalysisBookValue / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember |  |
Undiscounted Cash Flow Analysis, Aggregate Undiscounted Cash Flow, Percentage of Book Value | 0.00%bzh_UndiscountedCashFlowAnalysisAggregateUndiscountedCashFlowPercentageOfBookValue / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember | 0.00%bzh_UndiscountedCashFlowAnalysisAggregateUndiscountedCashFlowPercentageOfBookValue / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember |  |
East Segment |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of Communities on Watch List |  | 1 bzh_NumberOfCommunitiesOnWatchList / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember |  |
Undiscounted Cash Flow Analysis Prepared for Number of Communities |  | 0 bzh_UndiscountedCashFlowAnalysisPreparedForNumberOfCommunities / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember |  |
Undiscounted Cash Flow Analysis, Pre-analysis Book Value |  | 0 bzh_UndiscountedCashFlowAnalysisPreAnalysisBookValue / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember |  |
Undiscounted Cash Flow Analysis, Aggregate Undiscounted Cash Flow, Percentage of Book Value |  | 0.00%bzh_UndiscountedCashFlowAnalysisAggregateUndiscountedCashFlowPercentageOfBookValue / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember |  |
Southeast Segment |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of Communities on Watch List |  | 2 bzh_NumberOfCommunitiesOnWatchList / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember |  |
Undiscounted Cash Flow Analysis Prepared for Number of Communities |  | 1 bzh_UndiscountedCashFlowAnalysisPreparedForNumberOfCommunities / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember |  |
Undiscounted Cash Flow Analysis, Pre-analysis Book Value |  | 7,478,000 bzh_UndiscountedCashFlowAnalysisPreAnalysisBookValue / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember |  |
Undiscounted Cash Flow Analysis, Aggregate Undiscounted Cash Flow, Percentage of Book Value |  | 107.90%bzh_UndiscountedCashFlowAnalysisAggregateUndiscountedCashFlowPercentageOfBookValue / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember |  |

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