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Inventory - Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Real Estate, Write-down or Reserve [Line Items]        
Inventory impairments and option contract abandonments $ 0us-gaap_InventoryWriteDown $ 880us-gaap_InventoryWriteDown $ 0us-gaap_InventoryWriteDown $ 911us-gaap_InventoryWriteDown
Continuing Operations [Member]        
Real Estate, Write-down or Reserve [Line Items]        
Land Held for Sale 0us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
28us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
0us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
59us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Inventory impairments and option contract abandonments 0us-gaap_InventoryWriteDown
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
880us-gaap_InventoryWriteDown
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
0us-gaap_InventoryWriteDown
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
911us-gaap_InventoryWriteDown
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Continuing Operations [Member] | East Segment        
Real Estate, Write-down or Reserve [Line Items]        
Land Held for Sale 0us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_EastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
0us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_EastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
0us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_EastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
31us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_EastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Continuing Operations [Member] | Southeast Segment        
Real Estate, Write-down or Reserve [Line Items]        
Land Held for Sale 0us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_SoutheastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
28us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_SoutheastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
0us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_SoutheastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
28us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_SoutheastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Lot Option Abandonments $ 0bzh_ImpairmentChargesLotOptionAbandonment
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_SoutheastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
$ 852bzh_ImpairmentChargesLotOptionAbandonment
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_SoutheastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
$ 0bzh_ImpairmentChargesLotOptionAbandonment
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_SoutheastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
$ 852bzh_ImpairmentChargesLotOptionAbandonment
/ us-gaap_StatementBusinessSegmentsAxis
= bzh_SoutheastSegmentMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember