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Inventory - Narrative (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 home | Mar. 31, 2014 property | Mar. 31, 2015 home | Mar. 31, 2014 property | Sep. 30, 2014 home
Real Estate Properties [Line Items] |  |  |  |  |
Number of substantially completed homes unsold | 115 bzh_NumberofRealEstatePropertiesCompletedHomesUnsold |  | 115 bzh_NumberofRealEstatePropertiesCompletedHomesUnsold |  | 205 bzh_NumberofRealEstatePropertiesCompletedHomesUnsold
Total value of substantially completed homes | $ 29.3 bzh_ValueOfRealEstatePropertiesCompletedUnsoldHomes |  | $ 29.3 bzh_ValueOfRealEstatePropertiesCompletedUnsoldHomes |  | $ 48.0 bzh_ValueOfRealEstatePropertiesCompletedUnsoldHomes
Threshold number of homes below a minimum threshold of profitability | 10 bzh_ThresholdNumberofHomesBelowaMinimumThreshold |  | 10 bzh_ThresholdNumberofHomesBelowaMinimumThreshold |  |
Number of Communities on Watch List | 1 bzh_NumberOfCommunitiesOnWatchList | 4 bzh_NumberOfCommunitiesOnWatchList | 1 bzh_NumberOfCommunitiesOnWatchList | 4 bzh_NumberOfCommunitiesOnWatchList |
Southeast Segment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of Communities on Watch List |  | 2 bzh_NumberOfCommunitiesOnWatchList / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember |  |  |

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- Definition Number of Communities on Watch List + References No definition available. + Details
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- Definition Number of Real Estate Properties, Completed Homes Unsold + References No definition available. + Details
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- Definition Threshold Number of Homes Below a Minimum Threshold + References No definition available. + Details
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- Definition Value of Real Estate Properties, Completed Unsold Homes + References No definition available. + Details
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- Details
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Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=bzh_SoutheastSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |