Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenues	$ 35,460.4	$ 33,480.0	$ 27,774.2
Cost of sales	26,110.0	22,975.9	19,899.2
Selling, general and administrative expense	3,248.8	2,933.7	2,556.2
Gain on sale of assets	0.0	0.0	(14.0)
Loss on extinguishment of debt	0.0	0.0	18.1
Other (income) expense	(213.1)	(59.3)	(41.6)
Income before income taxes	6,314.7	7,629.7	5,356.3
Income tax expense	1,519.5	1,734.1	1,165.1
Net income	4,795.2	5,895.6	4,191.2
Net income attributable to noncontrolling interests	49.5	38.1	15.4
Net income attributable to D.R. Horton, Inc.	$ 4,745.7	$ 5,857.5	$ 4,175.8
Other comprehensive income, net of income tax:
Basic net income per common share attributable to D.R. Horton, Inc.	$ 13.93	$ 16.65	$ 11.56
Weighted average number of common shares	340.7	351.7	361.1
Diluted net income per common share attributable to D.R. Horton, Inc.	$ 13.82	$ 16.51	$ 11.41
Adjusted weighted average number of common shares	343.3	354.8	365.8