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Basis of Presentation and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Summary of Significant Accounting Policies [Line Items] |  |  |
Total revenue | $ 2,127,077 | $ 2,087,739 | $ 2,107,133
Homebuilding revenue |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Total revenue | 2,116,910 | 2,077,245 | 2,077,360
Land sales and other revenue |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Total revenue | $ 10,167 | $ 10,494 | $ 29,773

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- Definition Summary of Significant Accounting Policies [Line Items] + References No definition available. + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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