Supplemental Guarantor Information (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Sep. 30, 2013		Mar. 31, 2013	Sep. 30, 2012
ASSETS
Cash and cash equivalents	$ 951.4		$ 936.5		$ 1,150.5	$ 1,047.7
Investments in subsidiaries	0		0
Other assets	481.2		517.4
Advances to Affiliate	0		0
Total assets	9,372.8		8,856.4
LIABILITIES & EQUITY
Accounts payable and other liabilities	1,161.1		1,286.0
Intercompany payables	0		0
Notes payable	3,862.1		3,509.0
Total liabilities	5,023.2		4,795.0
Total stockholders' equity	4,346.3		4,058.5
Noncontrolling interests	3.3		2.9
Total equity	4,349.6		4,061.4
Total liabilities and equity	9,372.8		8,856.4
D.R. Horton, Inc. [Member]
ASSETS
Cash and cash equivalents	862.8		871.4		1,061.6	968.9
Investments in subsidiaries	2,648.4		2,477.7
Other assets	143.1		167.0
Advances to Affiliate	1,888.9		1,697.0
Total assets	8,311.9		7,709.7
LIABILITIES & EQUITY
Accounts payable and other liabilities	330.8		383.8
Intercompany payables	0		0
Notes payable	3,634.8		3,267.4
Total liabilities	3,965.6		3,651.2
Total stockholders' equity	4,346.3		4,058.5
Noncontrolling interests	0		0
Total equity	4,346.3		4,058.5
Total liabilities and equity	8,311.9		7,709.7
Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	63.0		38.4		64.3	56.3
Investments in subsidiaries	0		0
Other assets	224.4		233.4
Advances to Affiliate	0		0
Total assets	5,066.5		4,734.2
LIABILITIES & EQUITY
Accounts payable and other liabilities	705.7		766.5
Intercompany payables	1,857.3		1,664.2
Notes payable	3.5		3.0
Total liabilities	2,566.5		2,433.7
Total stockholders' equity	2,500.0		2,300.5
Noncontrolling interests	0		0
Total equity	2,500.0		2,300.5
Total liabilities and equity	5,066.5		4,734.2
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	25.6		26.7		24.6	22.5
Investments in subsidiaries	0		0
Other assets	113.7		117.0
Advances to Affiliate	0		0
Total assets	531.7		587.2
LIABILITIES & EQUITY
Accounts payable and other liabilities	124.6		135.7
Intercompany payables	31.6		32.8
Notes payable	223.8		238.6
Total liabilities	380.0		407.1
Total stockholders' equity	148.4		177.2
Noncontrolling interests	3.3		2.9
Total equity	151.7		180.1
Total liabilities and equity	531.7		587.2
Eliminations [Member]
ASSETS
Cash and cash equivalents	0		0		0	0
Investments in subsidiaries	(2,648.4)		(2,477.7)
Other assets	0		0
Advances to Affiliate	(1,888.9)		(1,697.0)
Total assets	(4,537.3)		(4,174.7)
LIABILITIES & EQUITY
Accounts payable and other liabilities	0		0
Intercompany payables	(1,888.9)		(1,697.0)
Notes payable	0		0
Total liabilities	(1,888.9)		(1,697.0)
Total stockholders' equity	(2,648.4)		(2,477.7)
Noncontrolling interests	0		0
Total equity	(2,648.4)		(2,477.7)
Total liabilities and equity	(4,537.3)		(4,174.7)
Homebuilding [Member]
ASSETS
Cash and cash equivalents	930.8		913.3
Restricted cash	79.8		77.8
Inventories	6,783.6	[1]	6,197.4	[1]
Deferred income taxes	569.8		586.6
Property and equipment, net	123.3		106.7
Other assets	427.8		460.5
Goodwill	41.2		38.9
Total assets	8,956.3		8,381.2
LIABILITIES & EQUITY
Notes payable	3,638.3		3,270.4
Total liabilities	4,759.8		4,502.8
Homebuilding [Member] | D.R. Horton, Inc. [Member]
ASSETS
Restricted cash	78.6		76.5
Inventories	2,444.8		2,177.4
Deferred income taxes	199.0		201.7
Property and equipment, net	46.3		41.0
Goodwill	0		0
Homebuilding [Member] | Guarantor Subsidiaries [Member]
ASSETS
Restricted cash	1.2		1.2
Inventories	4,323.2		4,002.9
Deferred income taxes	370.8		384.9
Property and equipment, net	42.7		34.5
Goodwill	41.2		38.9
Homebuilding [Member] | Non-Guarantor Subsidiaries [Member]
ASSETS
Restricted cash	0		0.1
Inventories	15.6		17.1
Deferred income taxes	0		0
Property and equipment, net	34.3		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	20.6		23.2
Other assets	53.4		56.9
Mortgage loans held for sale	342.5		395.1
Total assets	416.5		475.2
LIABILITIES & EQUITY
Total liabilities	263.4		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	342.5		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.