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Inventory - Total Owned Inventory by Segment (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014
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Segment Reporting Information [Line Items] |  |
Projects in Progress | $ 1,421,589 bzh_InventoryProjectsInProgress | $ 1,204,776 bzh_InventoryProjectsInProgress
Land held for future development | 270,518 us-gaap_LandAvailableForDevelopment | 301,048 us-gaap_LandAvailableForDevelopment
Land held for sale | 64,929 us-gaap_InventoryLandHeldForSale | 51,672 us-gaap_InventoryLandHeldForSale
Total owned inventory | 1,757,036 us-gaap_InventoryOperativeBuilders | 1,557,496 us-gaap_InventoryOperativeBuilders
West Segment |  |
Segment Reporting Information [Line Items] |  |
Projects in Progress | 576,985 bzh_InventoryProjectsInProgress / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember | 462,508 bzh_InventoryProjectsInProgress / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember
Land held for future development | 230,362 us-gaap_LandAvailableForDevelopment / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember | 260,898 us-gaap_LandAvailableForDevelopment / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember
Land held for sale | 10,088 us-gaap_InventoryLandHeldForSale / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember | 10,026 us-gaap_InventoryLandHeldForSale / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember
Total owned inventory | 817,435 us-gaap_InventoryOperativeBuilders / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember | 733,432 us-gaap_InventoryOperativeBuilders / us-gaap_StatementBusinessSegmentsAxis = bzh_WestSegmentMember
East Segment |  |
Segment Reporting Information [Line Items] |  |
Projects in Progress | 392,952 bzh_InventoryProjectsInProgress / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember | 353,859 bzh_InventoryProjectsInProgress / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember
Land held for future development | 29,215 us-gaap_LandAvailableForDevelopment / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember | 29,239 us-gaap_LandAvailableForDevelopment / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember
Land held for sale | 33,048 us-gaap_InventoryLandHeldForSale / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember | 34,530 us-gaap_InventoryLandHeldForSale / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember
Total owned inventory | 455,215 us-gaap_InventoryOperativeBuilders / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember | 417,628 us-gaap_InventoryOperativeBuilders / us-gaap_StatementBusinessSegmentsAxis = bzh_EastSegmentMember
Southeast Segment |  |
Segment Reporting Information [Line Items] |  |
Projects in Progress | 292,380 bzh_InventoryProjectsInProgress / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember | 264,843 bzh_InventoryProjectsInProgress / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember
Land held for future development | 10,941 us-gaap_LandAvailableForDevelopment / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember | 10,911 us-gaap_LandAvailableForDevelopment / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember
Land held for sale | 19,931 us-gaap_InventoryLandHeldForSale / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember | 4,821 us-gaap_InventoryLandHeldForSale / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember
Total owned inventory | 323,252 us-gaap_InventoryOperativeBuilders / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember | 280,575 us-gaap_InventoryOperativeBuilders / us-gaap_StatementBusinessSegmentsAxis = bzh_SoutheastSegmentMember
Unallocated and Other |  |
Segment Reporting Information [Line Items] |  |
Projects in Progress | 159,272 bzh_InventoryProjectsInProgress / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | 123,566 bzh_InventoryProjectsInProgress / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember
Land held for future development | 0 us-gaap_LandAvailableForDevelopment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | 0 us-gaap_LandAvailableForDevelopment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember
Land held for sale | 1,862 us-gaap_InventoryLandHeldForSale / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | 2,295 us-gaap_InventoryLandHeldForSale / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember
Total owned inventory | $ 161,134 us-gaap_InventoryOperativeBuilders / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | $ 125,861 us-gaap_InventoryOperativeBuilders / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember

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- Definition Carrying amount as of the balance sheet date of project in progress + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of parcels of land held for sale, and on which the entity has no intention or no further intention to perform construction activities. + 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 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 + Details
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- Definition The net carrying amount as of the balance sheet date of the sum of the various components of an operative builder's inventory, including finished homes. Operative builders primarily consist of entities that develop land, construct residential homes and commercial and industrial buildings thereon, and sell them to home buyers and operators of the commercial and industrial properties. + 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 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of land available for development. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph d -Article 7 + Details
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