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Revenue (Notes)
 6 Months Ended
Mar. 31, 2025
Revenues [Abstract]  
Revenue from Contract with Customer [Text Block] Revenues
Revenues consist of:
Three Months Ended March 31,Six Months Ended March 31,
 2025202420252024
 (In millions)
Residential lot sales$346.9 $325.9 $594.2 $630.1 
Deferred development lot sales— 1.7 — 3.0 
Tract sales and other4.1 6.2 7.1 6.6 
$351.0 $333.8 $601.3 $639.7