Related Party Disclosures (Tables)
9 Months Ended
Jun. 30, 2023
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
 June 30, 2023September 30, 2022
 (Dollars in millions)
Residential lots under contract to sell to D.R. Horton13,600 17,800 
Owned lots subject to right of first offer with D.R. Horton based on executed purchase and sale agreements16,900 18,900 
Earnest money deposits from D.R. Horton for lots under contract$111.6 $130.1 
Remaining sales price of lots under contract with D.R. Horton$1,272.4 $1,389.7 

Lot and land sales to D.R. Horton in the three and nine months ended June 30, 2023 and 2022 were as follows:
Three Months Ended June 30,Nine Months Ended June 30,
 2023202220232022
 (Dollars in millions)
Residential lots sold to D.R. Horton3,187 3,038 7,947 11,823 
Residential lot sales revenues from sales to D.R. Horton$270.4 $257.6 $677.4 $975.7 
Decrease in contract liabilities on lot sales to D.R. Horton $0.6 $0.5 $4.0 $2.1 
Tract acres sold to D.R. Horton45 — 424 — 
Tract sales revenues from sales to D.R. Horton$22.8 $— $55.3 $—