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Capitalized Interest (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Rollforward of capitalized interest |  |
Capitalized interest, beginning of period | $ 237.4 | $ 217.7
Interest incurred | 46.2 | 36.9
Interest charged to cost of sales | (28.5) | (33.3)
Capitalized interest, end of period | 255.1 | 221.3
Financial Services [Member] |  |
Rollforward of capitalized interest |  |
Interest incurred | 8.1 | 4.0
Forestar Group [Member] |  |
Rollforward of capitalized interest |  |
Interest incurred | 8.2 | $ 8.1
Rental |  |
Rollforward of capitalized interest |  |
Interest incurred | $ 9.0 |

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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 https://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 https://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 https://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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- Details
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