Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Revenues	$ 7,972.9	$ 7,999.0	$ 15,230.6	$ 15,052.4
Cost of sales	5,996.2	5,429.9	11,287.5	10,335.6
Selling, general and administrative expense	773.6	695.1	1,510.5	1,361.0
Other (income) expense	(42.2)	(9.3)	(79.9)	(24.8)
Income before income taxes	1,245.3	1,883.3	2,512.5	3,380.6
Income tax expense	295.7	441.0	594.6	792.5
Net income	949.6	1,442.3	1,917.9	2,588.1
Net income attributable to noncontrolling interests	7.4	6.0	17.0	10.2
Net income attributable to D.R. Horton, Inc.	$ 942.2	$ 1,436.3	$ 1,900.9	$ 2,577.9
Basic net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 2.75	$ 4.07	$ 5.54	$ 7.27
Weighted average number of common shares	342.1	353.1	343.2	354.6
Diluted net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 2.73	$ 4.03	$ 5.50	$ 7.20
Adjusted weighted average number of common shares	344.9	356.3	345.9	358.2