Supplemental Guarantor Information (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Sep. 30, 2013		Jun. 30, 2013	Sep. 30, 2012
ASSETS
Cash and cash equivalents	$ 575.0		$ 936.5		$ 638.0	$ 1,047.7
Investments in subsidiaries	0		0
Other assets	516.4		517.4
Advances to Affiliate	0		0
Total assets	9,716.6		8,856.4
LIABILITIES & EQUITY
Accounts payable and other liabilities	1,301.4		1,286.0
Intercompany payables	0		0
Notes payable	3,445.3		3,509.0
Total liabilities	4,746.7		4,795.0
Total stockholders' equity	4,966.2		4,058.5
Noncontrolling interests	3.7		2.9
Total equity	4,969.9		4,061.4
Total liabilities and equity	9,716.6		8,856.4
D.R. Horton, Inc. [Member]
ASSETS
Cash and cash equivalents	467.5		871.4		547.1	968.9
Investments in subsidiaries	2,742.6		2,477.7
Other assets	147.9		167.0
Advances to Affiliate	2,248.6		1,697.0
Total assets	8,498.3		7,709.7
LIABILITIES & EQUITY
Accounts payable and other liabilities	392.6		383.8
Intercompany payables	0		0
Notes payable	3,139.5		3,267.4
Total liabilities	3,532.1		3,651.2
Total stockholders' equity	4,966.2		4,058.5
Noncontrolling interests	0		0
Total equity	4,966.2		4,058.5
Total liabilities and equity	8,498.3		7,709.7
Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	65.1		38.4		58.4	56.3
Investments in subsidiaries	0		0
Other assets	252.7		233.4
Advances to Affiliate	0		0
Total assets	5,585.1		4,734.2
LIABILITIES & EQUITY
Accounts payable and other liabilities	776.0		766.5
Intercompany payables	2,219.5		1,664.2
Notes payable	2.9		3.0
Total liabilities	2,998.4		2,433.7
Total stockholders' equity	2,586.7		2,300.5
Noncontrolling interests	0		0
Total equity	2,586.7		2,300.5
Total liabilities and equity	5,585.1		4,734.2
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	42.4		26.7		32.5	22.5
Investments in subsidiaries	0		0
Other assets	115.8		117.0
Advances to Affiliate	0		0
Total assets	624.4		587.2
LIABILITIES & EQUITY
Accounts payable and other liabilities	132.8		135.7
Intercompany payables	29.1		32.8
Notes payable	302.9		238.6
Total liabilities	464.8		407.1
Total stockholders' equity	155.9		177.2
Noncontrolling interests	3.7		2.9
Total equity	159.6		180.1
Total liabilities and equity	624.4		587.2
Eliminations [Member]
ASSETS
Cash and cash equivalents	0		0		0	0
Investments in subsidiaries	(2,742.6)		(2,477.7)
Other assets	0		0
Advances to Affiliate	(2,248.6)		(1,697.0)
Total assets	(4,991.2)		(4,174.7)
LIABILITIES & EQUITY
Accounts payable and other liabilities	0		0
Intercompany payables	(2,248.6)		(1,697.0)
Notes payable	0		0
Total liabilities	(2,248.6)		(1,697.0)
Total stockholders' equity	(2,742.6)		(2,477.7)
Noncontrolling interests	0		0
Total equity	(2,742.6)		(2,477.7)
Total liabilities and equity	(4,991.2)		(4,174.7)
Homebuilding [Member]
ASSETS
Cash and cash equivalents	538.5		913.3
Restricted cash	20.1		77.8
Inventories	7,375.6	[1]	6,197.4	[1]
Deferred income taxes	582.6		586.6
Property and equipment, net	132.9		106.7
Other assets	460.4		460.5
Goodwill	94.8		38.9
Total assets	9,204.9		8,381.2
LIABILITIES & EQUITY
Notes payable	3,142.4		3,270.4
Total liabilities	4,397.4		4,502.8
Homebuilding [Member] | D.R. Horton, Inc. [Member]
ASSETS
Restricted cash	18.3		76.5
Inventories	2,624.0		2,177.4
Deferred income taxes	201.6		201.7
Property and equipment, net	47.8		41.0
Goodwill	0		0
Homebuilding [Member] | Guarantor Subsidiaries [Member]
ASSETS
Restricted cash	1.8		1.2
Inventories	4,740.5		4,002.9
Deferred income taxes	381.0		384.9
Property and equipment, net	49.2		34.5
Goodwill	94.8		38.9
Homebuilding [Member] | Non-Guarantor Subsidiaries [Member]
ASSETS
Restricted cash	0		0.1
Inventories	11.1		17.1
Deferred income taxes	0		0
Property and equipment, net	35.9		31.2
Goodwill	0		0
Homebuilding [Member] | Eliminations [Member]
ASSETS
Restricted cash	0		0
Inventories	0		0
Deferred income taxes	0		0
Property and equipment, net	0		0
Goodwill	0		0
Financial Services [Member]
ASSETS
Cash and cash equivalents	36.5		23.2
Other assets	56.0		56.9
Mortgage loans held for sale	419.2		395.1
Total assets	511.7		475.2
LIABILITIES & EQUITY
Total liabilities	349.3		292.2
Financial Services [Member] | D.R. Horton, Inc. [Member]
ASSETS
Mortgage loans held for sale	0		0
Financial Services [Member] | Guarantor Subsidiaries [Member]
ASSETS
Mortgage loans held for sale	0		0
Financial Services [Member] | Non-Guarantor Subsidiaries [Member]
ASSETS
Mortgage loans held for sale	419.2		395.1
Financial Services [Member] | Eliminations [Member]
ASSETS
Mortgage loans held for sale	$ 0		$ 0

[1] Homebuilding inventories are the only assets included in the measure of homebuilding segment assets used by the Company’s chief operating decision makers.