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Revenue (Details) $ in Millions	12 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) Lot
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 1,459.3	$ 1,275.7	$ 1,455.5
Deferred development lot sales	8.1	29.0	26.8
Tract sales and other	42.0	132.2	36.8
Revenues	1,509.4	1,436.9	1,519.1
Earnest money on sales contracts	$ 172.3	$ 121.4
Deferred Development Project
Revenue from External Customer [Line Items]
Earnest money on sales contracts			$ 63.9
Number of Lots Sold | Lot			854

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