Supplemental Guarantor Information (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Dec. 31, 2012	Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities			$ 188.6	$ (573.7)
INVESTING ACTIVITIES
Purchases of property and equipment			(43.3)	(49.9)
Decrease (increase) in restricted cash			(1.7)	57.7
Net principal increase of mortgage loans held in portfolio and real estate owned			(6.3)	(2.8)
Payments for (Proceeds from) Other Investing Activities			0.0	0.0
Payments to Acquire Other Investments		$ (18.6)	(14.8)	0.0
Payment related to acquisition of a business	$ (70.9)		(68.7)	(222.7)
Net cash provided by (used in) investing activities			(134.8)	(217.7)
FINANCING ACTIVITIES
Proceeds from Notes Payable			1,560.8	686.3
Repayments of Notes Payable			(1,433.5)	(273.9)
Proceeds from (Payments for) Other Financing Activities			0.0	0.0
Proceeds from stock associated with certain employee benefit plans			24.0	43.1
Income tax benefit from employee stock awards			7.3	1.6
Cash dividends paid			(68.6)	(25.8)
Net cash provided by (used in) financing activities			90.0	431.3
(Decrease) increase in cash and cash equivalents			143.8	(360.1)
Cash and cash equivalents at beginning of period			661.8	977.4
Cash and cash equivalents at end of period	805.6		805.6	617.3
D.R. Horton, Inc. [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities			164.7	(259.5)
INVESTING ACTIVITIES
Purchases of property and equipment			(21.4)	(17.9)
Decrease (increase) in restricted cash			(1.2)	58.2
Net principal increase of mortgage loans held in portfolio and real estate owned			0.0	0.0
Payments for (Proceeds from) Other Investing Activities			58.8	(329.0)
Payments to Acquire Other Investments			(14.8)
Payment related to acquisition of a business			(68.7)	(222.7)
Net cash provided by (used in) investing activities			(47.3)	(511.4)
FINANCING ACTIVITIES
Proceeds from Notes Payable			1,472.0	622.0
Repayments of Notes Payable			(1,433.0)	(273.9)
Proceeds from (Payments for) Other Financing Activities			0.0	0.0
Proceeds from stock associated with certain employee benefit plans			24.0	43.1
Income tax benefit from employee stock awards			7.3	1.6
Cash dividends paid			(68.6)	(25.8)
Net cash provided by (used in) financing activities			1.7	367.0
(Decrease) increase in cash and cash equivalents			119.1	(403.9)
Cash and cash equivalents at beginning of period			497.4	871.4
Cash and cash equivalents at end of period	616.5		616.5	467.5
Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities			127.1	(281.7)
INVESTING ACTIVITIES
Purchases of property and equipment			(18.2)	(23.7)
Decrease (increase) in restricted cash			(0.5)	(0.6)
Net principal increase of mortgage loans held in portfolio and real estate owned			0.0	0.0
Payments for (Proceeds from) Other Investing Activities			0.0	0.0
Payments to Acquire Other Investments			0.0
Payment related to acquisition of a business			0.0	0.0
Net cash provided by (used in) investing activities			(18.7)	(24.3)
FINANCING ACTIVITIES
Proceeds from Notes Payable			0.0	0.0
Repayments of Notes Payable			(0.3)	0.0
Proceeds from (Payments for) Other Financing Activities			(93.9)	332.7
Proceeds from stock associated with certain employee benefit plans			0.0	0.0
Income tax benefit from employee stock awards			0.0	0.0
Cash dividends paid			0.0	0.0
Net cash provided by (used in) financing activities			(94.2)	332.7
(Decrease) increase in cash and cash equivalents			14.2	26.7
Cash and cash equivalents at beginning of period			89.5	38.4
Cash and cash equivalents at end of period	103.7		103.7	65.1
Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities			(88.2)	7.5
INVESTING ACTIVITIES
Purchases of property and equipment			(3.7)	(8.3)
Decrease (increase) in restricted cash			0.0	0.1
Net principal increase of mortgage loans held in portfolio and real estate owned			(6.3)	(2.8)
Payments for (Proceeds from) Other Investing Activities			0.0	0.0
Payments to Acquire Other Investments			0.0
Payment related to acquisition of a business			0.0	0.0
Net cash provided by (used in) investing activities			(10.0)	(11.0)
FINANCING ACTIVITIES
Proceeds from Notes Payable			88.8	64.3
Repayments of Notes Payable			(0.2)	0.0
Proceeds from (Payments for) Other Financing Activities			35.1	(3.7)
Proceeds from stock associated with certain employee benefit plans			0.0	0.0
Income tax benefit from employee stock awards			0.0	0.0
Cash dividends paid			(15.0)	(40.0)
Net cash provided by (used in) financing activities			108.7	20.6
(Decrease) increase in cash and cash equivalents			10.5	17.1
Cash and cash equivalents at beginning of period			74.9	67.6
Cash and cash equivalents at end of period	85.4		85.4	84.7
Eliminations [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities			(15.0)	(40.0)
INVESTING ACTIVITIES
Purchases of property and equipment			0.0	0.0
Decrease (increase) in restricted cash			0.0	0.0
Net principal increase of mortgage loans held in portfolio and real estate owned			0.0	0.0
Payments for (Proceeds from) Other Investing Activities			(58.8)	329.0
Payments to Acquire Other Investments			0.0
Payment related to acquisition of a business			0.0	0.0
Net cash provided by (used in) investing activities			(58.8)	329.0
FINANCING ACTIVITIES
Proceeds from Notes Payable			0.0	0.0
Repayments of Notes Payable			0.0	0.0
Proceeds from (Payments for) Other Financing Activities			58.8	(329.0)
Proceeds from stock associated with certain employee benefit plans			0.0	0.0
Income tax benefit from employee stock awards			0.0	0.0
Cash dividends paid			15.0	40.0
Net cash provided by (used in) financing activities			73.8	(289.0)
(Decrease) increase in cash and cash equivalents			0.0	0.0
Cash and cash equivalents at beginning of period			0.0	0.0
Cash and cash equivalents at end of period	$ 0.0		$ 0.0	$ 0.0