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Capitalized Interest Capitalized Interest (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Real Estate Inventory, Capitalized Interest Costs [Roll Forward] |  |  |
Capitalized interest, beginning of year | $ 207.7 | $ 180.1 | $ 162.7
Interest incurred | 152.2 | 153.3 | 140.2
Charged to cost of sales | (142.2) | (125.7) | (122.8)
Capitalized interest, end of year | 217.7 | 207.7 | 180.1
Financial Services [Member] |  |  |
Real Estate Inventory, Capitalized Interest Costs [Roll Forward] |  |  |
Interest incurred | 17.0 | 19.1 | 16.1
Forestar Group [Member] |  |  |
Real Estate Inventory, Capitalized Interest Costs [Roll Forward] |  |  |
Interest incurred | $ 41.6 | $ 41.2 | $ 19.4

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- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Carrying amount as of the balance sheet date of interest costs that were capitalized to properties under development during the land development and construction period of a project, and which are included in inventory. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Amount of interest cost charged to cost of sales that had been previously capitalized to inventory. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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