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Revenue (Notes)
 6 Months Ended
Mar. 31, 2026
Revenues [Abstract]  
Revenue from Contract with Customer [Text Block] Revenues
Revenues consist of:
Three Months Ended March 31,Six Months Ended March 31,
 2026202520262025
 (In millions)
Residential lot sales$331.4 $346.9 $566.6 $594.2 
Tract sales and other42.9 4.1 80.7 7.1 
$374.3 $351.0 $647.3 $601.3