Discounted Cash Flow Analyses, Number of Impaired Communities

No definition available.

Name:	bzh_DiscountedCashFlowAnalysesNumberOfImpairedCommunities
Namespace Prefix:	bzh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Inventory Impairment, Results of Discounted Cash Flow Analysis

+ References

No definition available.

+ Details

Name:	bzh_InventoryImpairmentResultsofDiscountedCashFlowAnalysis
Namespace Prefix:	bzh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Inventory Write Down and Impairment to Assets to be Disposed of

+ References

No definition available.

+ Details

Name:	bzh_InventoryWriteDownandImpairmenttoAssetstobeDisposedof
Namespace Prefix:	bzh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of Communities on Watch List

+ References

No definition available.

+ Details

Name:	bzh_NumberOfCommunitiesOnWatchList
Namespace Prefix:	bzh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Real Estate Properties, Completed Homes Unsold

+ References

No definition available.

+ Details

Name:	bzh_NumberofRealEstatePropertiesCompletedHomesUnsold
Namespace Prefix:	bzh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Properties Included in Land Held for Sale

+ References

No definition available.

+ Details

Name:	bzh_PropertiesIncludedinLandHeldforSale
Namespace Prefix:	bzh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold Number of Homes Below a Minimum Threshold of Profitability

+ References

No definition available.

+ Details

Name:	bzh_ThresholdNumberofHomesBelowaMinimumThresholdofProfitability
Namespace Prefix:	bzh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Value of Real Estate Properties, Completed Unsold Homes

+ References

No definition available.

+ Details

Name:	bzh_ValueOfRealEstatePropertiesCompletedUnsoldHomes
Namespace Prefix:	bzh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2611-110228

+ Details

Name:	us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_InventoryDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=bzh_WestSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=bzh_EastSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Inventory - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
Inventory - Narrative (Details) $ in Thousands	Jun. 30, 2019 USD ($) home Community	Jun. 30, 2018 USD ($) Community	Jun. 30, 2019 USD ($) home Community	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($) home
Inventory Disclosure [Abstract]
Number of substantially completed homes unsold \| home	185		185		240
Total value of substantially completed homes \| $	$ 62,600		$ 62,600		$ 84,800
Threshold number of homes below a minimum threshold of profitability \| home			10
Impairment and abandonment charges \| $	$ 0	$ 168	$ 148,618	$ 618
Number of communities impaired \| Community			10
Real Estate Properties [Line Items]
Number of communities on watch list \| Community	5	4
Inventory impairment charge \| $			$ 110,030
Land Held for Sale \| $	$ 0	$ 168	$ 38,588	168
Number of properties included in land held for sale \| Community			6
West Segment
Real Estate Properties [Line Items]
Number of communities on watch list \| Community	3	2
Land Held for Sale \| $	$ 0	$ 0	$ 37,963	0
East Segment
Real Estate Properties [Line Items]
Number of communities on watch list \| Community	1
Land Held for Sale \| $	$ 0	$ 168	$ 0	$ 168
Southeast Segment
Real Estate Properties [Line Items]
Number of communities on watch list \| Community	1	2