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Inventory - Narrative (Details) (USD $) | 12 Months Ended
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Sep. 30, 2014 home Community | Sep. 30, 2013 home | Sep. 30, 2012 Community
Real Estate Properties [Line Items] |  |  |  |
Impairment of Ongoing Project | $ 5,400,000 |  | $ 59,000 |
Threshold Number of Homes Below a Minimum Threshold of Profitability | 10 |  |  |
Number of subtantially completed homes not subject to a sales contract | 205 |  | 113 |
Total value of substantially completed homes | 48,000,000 |  | 30,700,000 |
Owned inventory | 1,557,496,000 |  | 1,304,694,000 |
Number of communities impaired | 2 | [1] |  | 5
Deposits & Non-refundable Preacquisition Costs Incurred | 43,529,000 |  | 37,313,000 |
Total remaining purchase price committed under all options | 420,534,000 |  | 288,638,000 |
Minimum |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Discount rate | 13.00% |  |  | 11.20%
Maximum |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Discount rate | 15.00% |  |  | 17.00%
CALIFORNIA |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Owned inventory | 426,100,000 |  | 388,100,000 |
East |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Owned inventory | 417,628,000 |  | 361,218,000 |
Southeast |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Owned inventory | 280,575,000 |  | 210,452,000 |
Discontinued Operations |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of communities impaired | 0 |  |  | 0
Lot Option Abandonments | 0 |  | 0 | 16,000
Discontinued Operations | East |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of Ongoing Project | 100,000 | [1] |  |
Threshold Number of Homes Below a Minimum Threshold of Profitability | 10 |  |  |
Continuing Operations |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of communities impaired | 2 | [1] |  | 5
Lot Option Abandonments | 2,626,000 |  | 445,000 | 2,415,000
Continuing Operations | East |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of Ongoing Project | 100,000 | [1] |  |
Threshold Number of Homes Below a Minimum Threshold of Profitability | 10 |  |  |
Number of communities impaired | 0 | [1] |  | 2
Lot Option Abandonments | 131,000 |  | 20,000 | 1,320,000
Continuing Operations | Southeast |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of communities impaired | 0 |  |  | 1
Lot Option Abandonments | 2,495,000 |  | 321,000 | 792,000
Wetlands Permitting Issue | Continuing Operations | Southeast |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Lot Option Abandonments | $ 1,700,000 |  |  |
[1] | During the year ended September 30, 2014, we recorded an impairment charge of $0.1 million in our East segment. The community had less than 10 lots remaining to close at the time of the analysis and therefore, consistent with our policy, we did not prepare an undiscounted or discounted cash flow analysis related to this community.

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- Definition Impairment Charges, Lot Option Abandonment + References No definition available. + Details
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- Definition Land Under Purchase Options, Consolidated and Unconsolidated VIEs, Total Remaining Obligations Under Option Agreements + References No definition available. + Details
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- Definition Land Under Purchase Options, Deposits and Non-refundable Preacquisition Costs + References No definition available. + Details
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- Definition Amount recognized as an operating expense or loss during the period to reduce the carrying amount of a project that has been impaired but not abandoned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + 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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