Supplemental Guarantor Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2013		Mar. 31, 2012
Homebuilding:
Interest expense	$ 3.0		$ 6.3		$ 7.1		$ 14.2
(Gain) loss on early retirement of debt, net					0		(0.1)
Financial Services [Abstract]
Interest expense	3.0		6.3		7.1		14.2
Income (loss) before income taxes	142.1	[1]	42.3	[1]	250.0	[1]	71.5	[1]
Income tax expense (benefit)	31.1		1.7		72.7		3.2
Net income	111.0		40.6		177.3		68.3
Comprehensive income	111.0		40.5		177.1		68.3
Homebuilding [Member]
Homebuilding:
Revenues	1,390.4		935.6		2,623.5		1,821.2
Cost of sales	1,109.2		771.2		2,111.5		1,508.1
Gross profit	281.2		164.4		512.0		313.1
Selling, general and administrative expense	155.1		127.5		295.8		246.5
Interest expense	1.9		5.5		5.1		12.5
(Gain) loss on early retirement of debt, net	0		0		0		(0.1)
Other (income)	(3.2)		(3.2)		(6.5)		(5.5)
Financial Services [Abstract]
Interest expense	1.9		5.5		5.1		12.5
Income (loss) before income taxes	127.4	[1]	34.6	[1]	217.6	[1]	59.7	[1]
Financial Services [Member]
Homebuilding:
Interest expense	1.1		0.8		2.0		1.7
Financial Services [Abstract]
Revenues, net of recourse and reinsurance expense	41.2		25.6		83.0		46.6
General and administrative expense	28.0		19.6		53.6		38.5
Interest expense	1.1		0.8		2.0		1.7
Interest and other (income)	(2.6)		(2.5)		(5.0)		(5.4)
Income (loss) before income taxes	14.7	[1]	7.7	[1]	32.4	[1]	11.8	[1]
D.R. Horton, Inc. [Member]
Financial Services [Abstract]
Income (loss) before income taxes	142.1		42.3		250.0		71.5
Income tax expense (benefit)	31.1		1.7		72.7		3.2
Net income	111.0		40.6		177.3		68.3
Comprehensive income	111.0		40.5		177.1		68.3
D.R. Horton, Inc. [Member] | Homebuilding [Member]
Homebuilding:
Revenues	441.2		316.2		847.5		610.1
Cost of sales	354.7		253.5		681.7		497.9
Gross profit	86.5		62.7		165.8		112.2
Selling, general and administrative expense	75.4		59.1		139.4		114.5
Equity in (income) of subsidiaries	(132.3)		(43.2)		(227.2)		(84.3)
Interest expense	1.9		5.5		5.1		12.5
(Gain) loss on early retirement of debt, net							0.1
Other (income)	(0.6)		(1.0)		(1.5)		(1.9)
Financial Services [Abstract]
Interest expense	1.9		5.5		5.1		12.5
Income (loss) before income taxes	142.1		42.3		250.0		71.5
Guarantor Subsidiaries [Member]
Financial Services [Abstract]
Income (loss) before income taxes	114.0		35.6		197.8		77.8
Income tax expense (benefit)	20.8		1.1		47.6		2.0
Net income	93.2		34.5		150.2		75.8
Comprehensive income	93.2		34.5		150.2		75.8
Guarantor Subsidiaries [Member] | Homebuilding [Member]
Homebuilding:
Revenues	947.2		616.7		1,770.6		1,206.7
Cost of sales	756.0		515.6		1,421.7		1,002.6
Gross profit	191.2		101.1		348.9		204.1
Selling, general and administrative expense	78.2		67.1		153.3		128.5
Other (income)	(1.0)		(1.6)		(2.2)		(2.2)
Financial Services [Abstract]
Income (loss) before income taxes	114.0		35.6		197.8		77.8
Non-Guarantor Subsidiaries [Member]
Financial Services [Abstract]
Income (loss) before income taxes	18.3		7.6		29.4		6.5
Income tax expense (benefit)	0.8		0.1		2.3		0.2
Net income	17.5		7.5		27.1		6.3
Comprehensive income	17.5		7.5		27.1		6.3
Non-Guarantor Subsidiaries [Member] | Homebuilding [Member]
Homebuilding:
Revenues	2.0		2.7		5.4		4.4
Cost of sales	(1.5)		2.1		8.1		7.6
Gross profit	3.5		0.6		(2.7)		(3.2)
Selling, general and administrative expense	1.5		1.3		3.1		3.5
Other (income)	(1.6)		(0.6)		(2.8)		(1.4)
Financial Services [Abstract]
Income (loss) before income taxes	3.6		(0.1)		(3.0)		(5.3)
Non-Guarantor Subsidiaries [Member] | Financial Services [Member]
Homebuilding:
Interest expense	1.1		0.8		2.0		1.7
Financial Services [Abstract]
Revenues, net of recourse and reinsurance expense	41.2		25.6		83.0		46.6
General and administrative expense	28.0		19.6		53.6		38.5
Interest expense	1.1		0.8		2.0		1.7
Interest and other (income)	(2.6)		(2.5)		(5.0)		(5.4)
Income (loss) before income taxes					32.4		11.8
Eliminations [Member]
Financial Services [Abstract]
Income (loss) before income taxes	(132.3)		(43.2)		(227.2)		(84.3)
Income tax expense (benefit)	(21.6)		(1.2)		(49.9)		(2.2)
Net income	(110.7)		(42.0)		(177.3)		(82.1)
Comprehensive income	(110.7)		(42.0)		(177.3)		(82.1)
Eliminations [Member] | Homebuilding [Member]
Homebuilding:
Equity in (income) of subsidiaries	132.3		43.2		227.2		84.3
Financial Services [Abstract]
Income (loss) before income taxes	$ (132.3)		$ (43.2)		$ (227.2)		$ (84.3)

[1] Expenses maintained at the corporate level consist primarily of interest and property taxes, which are capitalized and amortized to cost of sales or expensed directly, and the expenses related to operating the Company’s corporate office. The amortization of capitalized interest and property taxes is allocated to each segment based on the segment’s revenue, while interest expense and those expenses associated with the corporate office are allocated to each segment based on the segment’s inventory balances.