Supplemental Guarantor Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014		Mar. 31, 2013
Homebuilding:
Interest expense	$ 0		$ 3.0		$ 0		$ 7.1
Financial Services [Abstract]
Interest expense	0		3.0		0		7.1
Income (loss) before income taxes	201.9	[1]	142.1	[1]	391.6	[1]	250.0	[1]
Income tax expense (benefit)	70.9		31.1		137.5		72.7
Net income	131.0		111.0		254.1		177.3
Comprehensive income	131.3		111.0		254.4		177.1
Homebuilding [Member]
Homebuilding:
Revenues	1,696.6		1,390.4		3,332.3		2,623.5
Cost of sales	1,319.8		1,109.2		2,593.5		2,111.5
Gross profit	376.8		281.2		738.8		512.0
Selling, general and administrative expense	187.9		155.1		371.3		295.8
Equity in (income) of subsidiaries	0		0		0		0
Interest expense	0		1.9		0		5.1
Other (income)	(2.8)		(3.2)		(6.1)		(6.5)
Financial Services [Abstract]
Interest expense	0		1.9		0		5.1
Income (loss) before income taxes	191.7	[1]	127.4	[1]	373.6	[1]	217.6	[1]
Financial Services [Member]
Financial Services [Abstract]
Financial Services Revenue	38.4		41.2		73.3		83.0
General and administrative expense	30.2		28.0		60.0		53.6
Interest and other (income)	(2.0)		(1.5)		(4.7)		(3.0)
Income (loss) before income taxes	10.2	[1]	14.7	[1]	18.0	[1]	32.4	[1]
D.R. Horton, Inc. [Member]
Financial Services [Abstract]
Income (loss) before income taxes	201.9		142.1		391.6		250.0
Income tax expense (benefit)	70.9		31.1		137.5		72.7
Net income	131.0		111.0		254.1		177.3
Comprehensive income	131.0		111.0		254.1		177.1
D.R. Horton, Inc. [Member] | Homebuilding [Member]
Homebuilding:
Revenues	574.1		441.2		1,126.2		847.5
Cost of sales	453.5		354.7		883.0		681.7
Gross profit	120.6		86.5		243.2		165.8
Selling, general and administrative expense	87.9		75.4		176.9		139.4
Equity in (income) of subsidiaries	(169.0)		(132.3)		(324.6)		(227.2)
Interest expense			1.9				5.1
Other (income)	(0.2)		(0.6)		(0.7)		(1.5)
Financial Services [Abstract]
Interest expense			1.9				5.1
Income (loss) before income taxes	201.9		142.1		391.6		250.0
D.R. Horton, Inc. [Member] | Financial Services [Member]
Financial Services [Abstract]
Financial Services Revenue	0		0		0		0
General and administrative expense	0		0		0		0
Interest and other (income)	0		0		0		0
Income (loss) before income taxes	0		0		0		0
Guarantor Subsidiaries [Member]
Financial Services [Abstract]
Income (loss) before income taxes	159.1		114.0		307.3		197.8
Income tax expense (benefit)	55.9		20.8		107.9		47.6
Net income	103.2		93.2		199.4		150.2
Comprehensive income	103.5		93.2		199.7		150.2
Guarantor Subsidiaries [Member] | Homebuilding [Member]
Homebuilding:
Revenues	1,119.7		947.2		2,200.0		1,770.6
Cost of sales	864.0		756.0		1,704.5		1,421.7
Gross profit	255.7		191.2		495.5		348.9
Selling, general and administrative expense	97.7		78.2		190.2		153.3
Equity in (income) of subsidiaries	0		0		0		0
Interest expense			0				0
Other (income)	(1.1)		(1.0)		(2.0)		(2.2)
Financial Services [Abstract]
Interest expense			0				0
Income (loss) before income taxes	159.1		114.0		307.3		197.8
Guarantor Subsidiaries [Member] | Financial Services [Member]
Financial Services [Abstract]
Financial Services Revenue	0		0		0		0
General and administrative expense	0		0		0		0
Interest and other (income)	0		0		0		0
Income (loss) before income taxes	0		0		0		0
Non-Guarantor Subsidiaries [Member]
Financial Services [Abstract]
Income (loss) before income taxes	9.9		18.3		17.3		29.4
Income tax expense (benefit)	3.4		0.8		6.0		2.3
Net income	6.5		17.5		11.3		27.1
Comprehensive income	6.5		17.5		11.3		27.1
Non-Guarantor Subsidiaries [Member] | Homebuilding [Member]
Homebuilding:
Revenues	2.8		2.0		6.1		5.4
Cost of sales	2.3		(1.5)		6.0		8.1
Gross profit	0.5		3.5		0.1		(2.7)
Selling, general and administrative expense	2.3		1.5		4.2		3.1
Equity in (income) of subsidiaries	0		0		0		0
Interest expense			0				0
Other (income)	(1.5)		(1.6)		(3.4)		(2.8)
Financial Services [Abstract]
Interest expense			0				0
Income (loss) before income taxes	(0.3)		3.6		(0.7)		(3.0)
Non-Guarantor Subsidiaries [Member] | Financial Services [Member]
Financial Services [Abstract]
Financial Services Revenue	38.4		41.2		73.3		83.0
General and administrative expense	30.2		28.0		60.0		53.6
Interest and other (income)	(2.0)		(1.5)		(4.7)		(3.0)
Income (loss) before income taxes	10.2		14.7		18.0		32.4
Eliminations [Member]
Financial Services [Abstract]
Income (loss) before income taxes	(169.0)		(132.3)		(324.6)		(227.2)
Income tax expense (benefit)	(59.3)		(21.6)		(113.9)		(49.9)
Net income	(109.7)		(110.7)		(210.7)		(177.3)
Comprehensive income	(109.7)		(110.7)		(210.7)		(177.3)
Eliminations [Member] | Homebuilding [Member]
Homebuilding:
Revenues	0		0		0		0
Cost of sales	0		0		0		0
Gross profit	0		0		0		0
Selling, general and administrative expense	0		0		0		0
Equity in (income) of subsidiaries	169.0		132.3		324.6		227.2
Interest expense			0				0
Other (income)	0		0		0		0
Financial Services [Abstract]
Interest expense			0				0
Income (loss) before income taxes	(169.0)		(132.3)		(324.6)		(227.2)
Eliminations [Member] | Financial Services [Member]
Financial Services [Abstract]
Financial Services Revenue	0		0		0		0
General and administrative expense	0		0		0		0
Interest and other (income)	0		0		0		0
Income (loss) before income taxes	$ 0		$ 0		$ 0		$ 0

[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 those expenses associated with the corporate office are allocated to each segment based on the segment’s inventory balances.