Supplemental Guarantor Information (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Sep. 30, 2012		Jun. 30, 2012	Sep. 30, 2011
ASSETS
Cash and cash equivalents	$ 638.0		$ 1,047.7		$ 904.9	$ 732.6
Restricted cash	68.6		49.3
Inventories	5,911.5		4,165.2
Other assets	537.7		507.3
Total assets	8,287.0		7,248.2
LIABILITIES & EQUITY
Accounts payable and other liabilities	1,295.9		1,160.4
Notes payable	3,083.6		2,493.1
Total liabilities	4,379.5		3,653.5
Total stockholders' equity	3,904.7		3,592.1
Noncontrolling interests	2.8		2.6
Total equity	3,907.5		3,594.7
Total liabilities and equity	8,287.0		7,248.2
D.R. Horton, Inc. [Member]
ASSETS
Cash and cash equivalents	547.1		968.9		831.8	681.3
Marketable securities, available-for-sale			298.0
Restricted cash	67.2		48.7
Investments in subsidiaries	2,391.0		2,120.8
Inventories	2,040.4		1,375.1
Income Taxes Receivable			14.4
Deferred income taxes	216.8		227.6
Property and equipment, net	35.9		20.7
Other assets	132.7		127.8
Intercompany receivables	1,736.9		1,022.6
Total assets	7,168.0		6,224.6
LIABILITIES & EQUITY
Accounts payable and other liabilities	401.8		329.8
Notes payable	2,861.5		2,302.7
Total liabilities	3,263.3		2,632.5
Total stockholders' equity	3,904.7		3,592.1
Total equity	3,904.7		3,592.1
Total liabilities and equity	7,168.0		6,224.6
Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	58.4		56.3		47.6	31.3
Restricted cash	1.3		0.5
Inventories	3,853.3		2,770.6
Deferred income taxes	421.2		481.9
Property and equipment, net	28.7		20.7
Other assets	283.2		271.1
Goodwill	38.9		38.9
Total assets	4,685.0		3,640.0
LIABILITIES & EQUITY
Accounts payable and other liabilities	764.0		700.0
Intercompany payables	1,711.0		986.8
Notes payable	2.4		2.6
Total liabilities	2,477.4		1,689.4
Total stockholders' equity	2,207.6		1,950.6
Total equity	2,207.6		1,950.6
Total liabilities and equity	4,685.0		3,640.0
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	32.5		22.5		25.5	20.0
Restricted cash	0.1		0.1
Inventories	17.8		19.5
Property and equipment, net	31.5		31.2
Other assets	121.8		108.4
Mortgage loans held for sale	358.2		345.3
Total assets	561.9		527.0
LIABILITIES & EQUITY
Accounts payable and other liabilities	130.1		130.6
Intercompany payables	25.9		35.8
Notes payable	219.7		187.8
Total liabilities	375.7		354.2
Total stockholders' equity	183.4		170.2
Noncontrolling interests	2.8		2.6
Total equity	186.2		172.8
Total liabilities and equity	561.9		527.0
Eliminations [Member]
ASSETS
Investments in subsidiaries	(2,391.0)		(2,120.8)
Intercompany receivables	(1,736.9)		(1,022.6)
Total assets	(4,127.9)		(3,143.4)
LIABILITIES & EQUITY
Intercompany payables	(1,736.9)		(1,022.6)
Total liabilities	(1,736.9)		(1,022.6)
Total stockholders' equity	(2,391.0)		(2,120.8)
Total equity	(2,391.0)		(2,120.8)
Total liabilities and equity	(4,127.9)		(3,143.4)
Homebuilding [Member]
ASSETS
Cash and cash equivalents	607.8		1,030.4
Marketable securities, available-for-sale	0		298.0
Restricted cash	68.6		49.3
Inventories	5,911.5	[1]	4,165.2	[1]
Income Taxes Receivable	0		14.4
Deferred income taxes	638.0		709.5
Property and equipment, net	96.1		72.6
Other assets	473.5		456.8
Goodwill	38.9		38.9
Total assets	7,834.4		6,835.1
LIABILITIES & EQUITY
Notes payable	2,863.9		2,305.3
Total liabilities	4,113.6		3,415.3
Financial Services [Member]
ASSETS
Cash and cash equivalents	30.2		17.3
Other assets	64.2		50.5
Mortgage loans held for sale	358.2		345.3
Total assets	452.6		413.1
LIABILITIES & EQUITY
Total liabilities	$ 265.9		$ 238.2

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