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Inventory - Narrative (Details) (USD $)	3 Months Ended
	Dec. 31, 2014 home Community	Dec. 31, 2013 Community	Sep. 30, 2014 home
Real Estate Properties [Line Items]
Number of substantially completed homes	169bzh_NumberOfRealEstatePropertiesCompletedHomes		205bzh_NumberOfRealEstatePropertiesCompletedHomes
Total value of substantially completed homes	$ 42,300,000bzh_ValueOfRealEstatePropertiesCompletedUnsoldHomes		$ 48,000,000bzh_ValueOfRealEstatePropertiesCompletedUnsoldHomes
Inventory Impairment and Option Contract Abandonment	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Lot option abandonments	$ 0bzh_ImpairmentChargesLotOptionAbandonment	$ 31,000bzh_ImpairmentChargesLotOptionAbandonment
Number of Homes Remaining to be Sold, Community Watchlist Minimum	10bzh_NumberofHomesRemainingtobeSoldCommunityWatchlistMinimum
Threshold number of homes below a minimum threshold of profitability	10bzh_ThresholdNumberofHomesBelowaMinimumThresholdofProfitability
Number of impaired communities	2bzh_DiscountedCashFlowAnalysesNumberOfImpairedCommunities	1bzh_DiscountedCashFlowAnalysesNumberOfImpairedCommunities

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Impairment Charges, Lot Option Abandonment

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Number of Real Estate Properties, Completed Homes

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Threshold Number of Homes Below a Minimum Threshold of Profitability

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Value of Real Estate Properties, Completed Unsold Homes

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Name Accounting Standards Codification

-Topic 360

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