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Investments in Marketable Securities and Unconsolidated Entities - Outstanding Borrowings of Unconsolidated Entities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014
Schedule of Equity Method Investments [Line Items] |  |  |
Unrealized gain related to available-for-sale securities | $ 206 us-gaap_MarketableSecuritiesUnrealizedGainLoss | $ 0 us-gaap_MarketableSecuritiesUnrealizedGainLoss |
Beazer’s investment in unconsolidated entities | 34,735 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  | 38,341 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Unconsolidated Entities |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Beazer’s investment in unconsolidated entities | 9,765 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember |  | 13,576 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember
Total equity of unconsolidated entities | 47,090 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember |  | 59,336 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember
Total outstanding borrowings of unconsolidated entities | $ 10,424 bzh_EquityMethodInvestmentSummarizedFinancialInformationBorrowings / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember |  | $ 11,254 bzh_EquityMethodInvestmentSummarizedFinancialInformationBorrowings / dei_LegalEntityAxis = bzh_UnconsolidatedEntitiesMember

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- Definition Amount of equity, including noncontrolling interest, reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.g) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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