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Income Taxes - Textual (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | $ 14.6 | $ 14.9
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 0.0 | 0.0
Tax Benefit, Energy Efficient Home Credit | $ 39.5 | $ 70.4

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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