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Income Taxes - Narrative (Details) (USD $) | Mar. 31, 2015 | Sep. 30, 2014
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Income Tax Disclosure [Line Items] |  |
Uncertain tax positions reasonably possible to reverse in next twelve months | $ 3,200,000 us-gaap_LiabilityForUncertainTaxPositionsCurrent |
Accrued interest and penalties | 400,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 400,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Limit on operating loss carryforwards and recognition | 11,400,000 bzh_OperatingLossCarryforwardsAndRecognitionLimitationsOnUse |
Limit on operating loss carryforwards and recognition, tax-effected | 4,000,000 bzh_OperatingLossCarryforwardsAndRecognitionLimitationsOnUseTaxEffected |
Total deferred tax assets | 477,071,000 us-gaap_DeferredTaxAssetsGross |
Deferred tax liabilities | (43,496,000)us-gaap_DeferredTaxLiabilities |
Net deferred tax assets before valuation allowance | 433,575,000 bzh_NetDeferredTaxAssetGross |
Valuation allowance | 433,529,000 us-gaap_DeferredTaxAssetsValuationAllowance | 445,200,000 us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets | 46,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |
Maximum |  |
Income Tax Disclosure [Line Items] |  |
Limit on operating loss carryforwards and recognition | 392,700,000 bzh_OperatingLossCarryforwardsAndRecognitionLimitationsOnUse / us-gaap_RangeAxis = us-gaap_MaximumMember |
Limit on operating loss carryforwards and recognition, tax-effected | 425,600,000 bzh_OperatingLossCarryforwardsAndRecognitionLimitationsOnUseTaxEffected / us-gaap_RangeAxis = us-gaap_MaximumMember |
Certain Components Likely To Be Subject To Annual Limitation |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | 40,905,000 us-gaap_DeferredTaxAssetsGross / bzh_ClassificationOfNetDeferredTaxAssetsAxis = bzh_CertainComponentsLikelyToBeSubjectToAnnualLimitationMember |
Certain Components Likely To Be Subject To Annual Limitation | Maximum |  |
Income Tax Disclosure [Line Items] |  |
Net deferred tax assets | 40,900,000 us-gaap_DeferredTaxAssetsLiabilitiesNet / bzh_ClassificationOfNetDeferredTaxAssetsAxis = bzh_CertainComponentsLikelyToBeSubjectToAnnualLimitationMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Certain Components Likely To Be Subject To Annual Limitation | Minimum |  |
Income Tax Disclosure [Line Items] |  |
Net deferred tax assets | 7,900,000 us-gaap_DeferredTaxAssetsLiabilitiesNet / bzh_ClassificationOfNetDeferredTaxAssetsAxis = bzh_CertainComponentsLikelyToBeSubjectToAnnualLimitationMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Subject To Annual Limitation |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | 102,207,000 us-gaap_DeferredTaxAssetsGross / bzh_ClassificationOfNetDeferredTaxAssetsAxis = bzh_SubjectToAnnualLimitationMember |
Generally Not Subject to Annual Limitation |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | $ 333,959,000 us-gaap_DeferredTaxAssetsGross / bzh_ClassificationOfNetDeferredTaxAssetsAxis = bzh_GenerallyNotSubjecttoAnnualLimitationMember |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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