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Related Party Disclosures (Tables)
6 Months Ended
Mar. 31, 2024
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
 March 31, 2024September 30, 2023
 (Dollars in millions)
Residential lots under contract to sell to D.R. Horton17,300 14,400 
Owned lots subject to right of first offer with D.R. Horton based on executed purchase and sale agreements17,000 17,000 
Earnest money deposits from D.R. Horton for lots under contract$138.6 $117.1 
Remaining sales price of lots under contract with D.R. Horton$1,473.8 $1,319.2 
Lot and land sales to D.R. Horton in the three and six months ended March 31, 2024 and 2023 were as follows:
Three Months Ended March 31,Six Months Ended March 31,
 2024202320242023
 (Dollars in millions)
Residential lots sold to D.R. Horton3,105 2,666 5,939 4,760 
Residential lot sales revenues from sales to D.R. Horton$308.2 $219.9 $581.1 $407.0 
Decrease in contract liabilities on lot sales to D.R. Horton $2.1 $0.7 $2.8 $3.4 
Tract acres sold to D.R. Horton— 379 — 379 
Tract sales revenues from sales to D.R. Horton$— $32.5 $— $32.5