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Capitalized Interest (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Rollforward of capitalized interest |  |  |  |
Capitalized interest, beginning of period | $ 394.5 | $ 318.7 | $ 355.1 | $ 286.4
Interest incurred | 71.3 | 54.5 | 173.2 | 147.6
Interest charged to cost of sales | (38.4) | (35.3) | (100.9) | (96.1)
Capitalized interest, end of period | 427.4 | 337.9 | 427.4 | 337.9
Financial Services [Member] |  |  |  |
Rollforward of capitalized interest |  |  |  |
Interest incurred | 10.3 | 16.0 | 25.8 | 44.3
Forestar Group [Member] |  |  |  |
Rollforward of capitalized interest |  |  |  |
Interest incurred | 13.4 | 8.2 | 32.3 | 24.5
Rental |  |  |  |
Rollforward of capitalized interest |  |  |  |
Interest incurred | $ 16.6 | $ 18.8 | $ 45.3 | $ 44.6

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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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