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Capitalized Interest (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Rollforward of capitalized interest |  |
Capitalized interest, beginning of period | $ 355.1 | $ 286.4
Interest incurred | 46.7 | 42.6
Interest charged to cost of sales | (30.3) | (28.0)
Capitalized interest, end of period | 371.5 | 301.0
Financial Services [Member] |  |
Rollforward of capitalized interest |  |
Interest incurred | 8.1 | 14.9
Forestar Group [Member] |  |
Rollforward of capitalized interest |  |
Interest incurred | 8.3 | 8.1
Rental |  |
Rollforward of capitalized interest |  |
Interest incurred | $ 12.4 | $ 8.2

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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 -Topic 835 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483013/835-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483013/835-20-50-1 + 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483013/835-20-50-1 + 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483013/835-20-50-1 + 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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