Related Party Disclosures (Tables)

12 Months Ended

Sep. 30, 2020

Related Party Transactions [Abstract]

Schedule of Related Party Transactions [Table Text Block]

	September 30,
	2020		2019
	(Dollars in millions)
Residential lots under contract to sell to D.R. Horton	14,000		12,800
Residential lots subject to right of first offer with D.R. Horton	16,400		10,600
Earnest money deposits from D.R. Horton for lots under contract	$	92.2	$	88.7
Earnest money notes from D.R. Horton for lots under contract	$	4.8	$	—
Remaining purchase price of lots under contract with D.R. Horton	$	1,022.2	$	953.8

During fiscal 2020, 2019 and the nine months ended September 30, 2018, the Company's residential lot sales totaled 10,373, 4,132 and 1,024, and lot sales revenues were $880.3 million, $351.7 million and $72.0 million. Lot and land sales to D.R. Horton during those periods were as follows.

	Year Ended September 30,				Nine Months Ended September 30, 2018
	2020		2019
	(Dollars in millions)
Residential single-family lots sold to D.R. Horton	10,164		3,728		642
Residential lot sales revenues from sales to D.R. Horton	$	859.7	$	311.7	$	43.6
Residential tract acres sold to D.R. Horton	143		290		79
Residential tract sales revenues from sales to D.R. Horton	$	25.6	$	10.9	$	2.0