Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenues	$ 9,107.2	$ 7,972.9	$ 16,833.1	$ 15,230.6
Cost of sales	6,774.3	5,996.2	12,494.0	11,287.5
Selling, general and administrative expense	880.6	773.6	1,715.6	1,510.5
Other (income) expense	(76.2)	(42.2)	(152.5)	(79.9)
Income before income taxes	1,528.5	1,245.3	2,776.0	2,512.5
Income tax expense	344.8	295.7	636.6	594.6
Net income	1,183.7	949.6	2,139.4	1,917.9
Net income attributable to noncontrolling interests	11.6	7.4	19.9	17.0
Net income attributable to D.R. Horton, Inc.	$ 1,172.1	$ 942.2	$ 2,119.5	$ 1,900.9
Basic net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 3.54	$ 2.75	$ 6.38	$ 5.54
Weighted average number of common shares	330.9	342.1	332.1	343.2
Diluted net income per common share attributable to D.R. Horton, Inc. (in dollars per share)	$ 3.52	$ 2.73	$ 6.34	$ 5.50
Adjusted weighted average number of common shares	333.3	344.9	334.5	345.9