The total repurchase amount authorized by an entity's Board of Directors under a debt repurchase plan.

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The remaining repurchase amount authorized by an entity's Board of Directors under a debt repurchase plan.

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Maximum borrowing capacity of letter of credit.

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Percentage of Company Assets Owned by Entities that Guarantee Homebuilding Senior Notes and Revolving Credit Facility

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The cash outflow for the settlement of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, as it matures.

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Notes Payable - Homebuilding Textuals (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2024	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Letters of credit, amount outstanding		$ 242.9
Percentage of Company Assets Owned by Entities that Guarantee Homebuilding Senior Notes and Revolving Credit Facility		76.00%
Home Building Consolidated
Debt Instrument [Line Items]
Line of credit, current borrowing capacity		$ 2,190.0
Line of credit, maximum borrowing capacity		$ 3,000.0
Letter of Credit, Maximum Borrowing Capacity		100.00%
Line of credit, amount outstanding		$ 0.0	$ 0.0
Letters of credit, amount outstanding		210.1
Line of Credit Facility, Remaining Borrowing Capacity		1,980.0
Authorized Repurchase Of Debt Securities		500.0
Debt Repurchase Authorization Remaining		$ 500.0
Home Building Consolidated \| Senior Notes Subject to Repurchase Upon Change of Control and Ratings Downgrade [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		101.00%
Home Building Consolidated \| SeniorNoteFortyTwo [Member]
Debt Instrument [Line Items]
Senior notes, stated interest rate		2.50%
Home Building Consolidated \| SeniorNoteFortyTwo [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Maturities of Senior Debt	$ 500.0