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Basis of Presentation (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) Home | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 64.00% |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 36.00% |
Payments related to business acquisitions | $ | $ 23.0 | $ 24.2 | $ 5.6
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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