XML 74 R59.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Inventory Inventory - Quantitative Unobservable Inputs (Details) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 USD ($) home | Sep. 30, 2017 USD ($) home
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Average selling price (in thousands) | $ | $ 356 | $ 405
Minimum |  |
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Closings per community per month | 1 | 1
Maximum |  |
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Closings per community per month | 6 | 4
Discount Rate |  |
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Discount rate | 0.1511 | 0.1283

X
- Definition Alternative Investment, Measurement Input + References No definition available. + Details
Name: | bzh_AlternativeInvestmentMeasurementInput
Namespace Prefix: | bzh_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair Value Inputs, Average Selling Price + References No definition available. + Details
Name: | bzh_FairValueInputsAverageSellingPrice
Namespace Prefix: | bzh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair Value Inputs, Closings per community per month + References No definition available. + Details
Name: | bzh_FairValueInputsClosingsperCommunityperMonth
Namespace Prefix: | bzh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Quantitative unobservable inputs for inventory impairment [Table] + References No definition available. + Details
Name: | bzh_QuantitativeunobservableinputsforinventoryimpairmentLineItems
Namespace Prefix: | bzh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bzh_MeasurementInputTypeAxis=bzh_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |