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Related Party Transactions Related Party Transactions (Tables)
6 Months Ended
Mar. 31, 2022
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block] At March 31, 2022 and September 30, 2021, the Company owned approximately 64,200 and 64,400 residential lots, respectively, of which D.R. Horton had the following involvement.
 March 31,
2022
September 30,
2021
 (Dollars in millions)
Residential lots under contract to sell to D.R. Horton19,100 21,000 
Residential lots subject to right of first offer with D.R. Horton17,600 18,200 
Earnest money deposits from D.R. Horton for lots under contract$134.1 $143.1 
Earnest money notes from D.R. Horton for lots under contract$0.4 $0.7 
Remaining purchase price of lots under contract with D.R. Horton$1,460.8 $1,582.7 

In the three months ended March 31, 2022 and 2021, the Company sold 5,788 and 3,588 residential lots, and lot sales revenues were $421.5 million and $280.2 million. In the six months ended March 31, 2022 and 2021, the Company sold 10,304 and 7,155 residential lots, and lot sales revenues were $825.6 million and $587.1 million. Lot sales to D.R. Horton and the related revenue in those periods were as follows:
Three Months Ended March 31,Six Months Ended March 31,
 2022202120222021
 (Dollars in millions)
Residential single-family lots sold to D.R. Horton4,771 3,358 8,785 6,747 
Residential lot sales revenues from sales to D.R. Horton$390.2 $265.6 $718.2 $559.6 
Tract acres sold to D.R. Horton— 14 — 14 
Tract sales revenues from sales to D.R. Horton$— $3.0 $— $3.0