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Related Party Transactions Related Party Transactions (Tables)
 6 Months Ended
Mar. 31, 2021
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block] At March 31, 2021 and September 30, 2020, the Company owned or controlled through purchase contracts approximately 84,500 and 60,500 residential lots, of which D.R. Horton had the following involvement.
 March 31,
2021		September 30,
2020
 (Dollars in millions)
Residential lots under contract to sell to D.R. Horton20,400 14,000 
Residential lots subject to right of first offer with D.R. Horton16,700 16,400 
Earnest money deposits from D.R. Horton for lots under contract$134.1 $92.2 
Earnest money notes from D.R. Horton for lots under contract$2.6 $4.8 
Remaining purchase price of lots under contract with D.R. Horton$1,505.3 $1,022.2 

In the three months ended March 31, 2021 and 2020, the Company's residential lot sales totaled 3,588 and 1,951, and lot sales revenues were $280.2 million and $156.4 million. In the six months ended March 31, 2021 and 2020, the Company's residential lot sales totaled 7,155 and 4,373, and lot sales revenues were $587.1 million and $373.5 million. Lot and land sales to D.R. Horton during those periods were as follows.
Three Months Ended March 31,Six Months Ended March 31,
 2021202020212020
 (Dollars in millions)
Residential single-family lots sold to D.R. Horton3,358 1,906 6,747 4,296 
Residential lot sales revenues from sales to D.R. Horton$265.6 $151.2 $559.6 $366.8 
Tract acres sold to D.R. Horton14 — 14 36 
Tract sales revenues from sales to D.R. Horton$3.0 $— $3.0 $7.2