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Revenue (Notes)
12 Months Ended
Sep. 30, 2025
Revenues [Abstract]  
Revenue from Contract with Customer [Text Block] Revenues
Revenues consist of:
Year Ended September 30,
 202520242023
 (In millions)
Residential lot sales$1,544.3 $1,459.3 $1,275.7 
Deferred development lot sales— 8.1 29.0 
Tract sales and other118.1 42.0 132.2 
$1,662.4 $1,509.4 $1,436.9