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Basis of Presentation (Details) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2020 USD ($) Home | Dec. 31, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Noncontrolling Interest, Ownership Percentage by Parent | 65.00% |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 35.00% |
Payments related to business acquisitions | $ | $ 23.0 | $ 0.7
Business Acquisition, Number of Homes Acquired | 90 |
Business Acquisition, Number of Finished Lots Acquired | 95 |
Business Acquisition, Number of Lots Under Option Contracts | 840 |
Business Acquisition, Sales Order Backlog Acquired | 125 |

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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