Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenues	$ 33,480.0	$ 27,774.2	$ 20,311.1
Cost of sales	22,975.9	19,899.2	15,373.2
Selling, general and administrative expense	2,933.7	2,556.2	2,047.8
Gain on sale of assets	0.0	(14.0)	(59.5)
Loss on extinguishment of debt	0.0	18.1	0.0
Other (income) expense	(59.3)	(41.6)	(33.4)
Income before income taxes	7,629.7	5,356.3	2,983.0
Income tax expense	1,734.1	1,165.1	602.5
Net income	5,895.6	4,191.2	2,380.5
Net income attributable to noncontrolling interests	38.1	15.4	6.8
Net income attributable to D.R. Horton, Inc.	$ 5,857.5	$ 4,175.8	$ 2,373.7
Other comprehensive income, net of income tax:
Basic net income per common share attributable to D.R. Horton, Inc.	$ 16.65	$ 11.56	$ 6.49
Weighted average number of common shares	351.7	361.1	365.5
Diluted net income per common share attributable to D.R. Horton, Inc.	$ 16.51	$ 11.41	$ 6.41
Adjusted weighted average number of common shares	354.8	365.8	370.2