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Capitalized Interest (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Rollforward of capitalized interest |  |  |  |
Capitalized interest, beginning of period | $ 215.1 | $ 192.1 | $ 207.7 | $ 180.1
Interest incurred | 37.9 | 37.6 | 78.3 | 75.3
Interest charged to cost of sales | (34.4) | (29.2) | (67.4) | (54.9)
Capitalized interest, end of period | 218.6 | 200.5 | 218.6 | 200.5
Financial Services [Member] |  |  |  |
Rollforward of capitalized interest |  |  |  |
Interest incurred | 3.8 | 5.0 | 8.3 | 9.7
Forestar Group [Member] |  |  |  |
Rollforward of capitalized interest |  |  |  |
Interest incurred | $ 11.5 | $ 9.7 | $ 23.0 | $ 18.4

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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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- Details
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