Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Gross profit:
Income (loss) before income taxes	[1]	$ 333.8	$ 171.8	$ 784.6	$ 563.4
Income tax expense (benefit)		112.4	58.7	272.8	196.1
Net income		221.4	113.1	511.8	367.3
Other comprehensive income (loss), net of income tax:
Comprehensive income		$ 221.4	$ 113.1	$ 511.8	$ 367.6
Basic net income per common share (in dollars per share)		$ 0.60	$ 0.32	$ 1.40	$ 1.10
Net income per common share assuming dilution (in dollars per share)		0.60	0.32	1.39	1.05
Cash dividends declared per common share (in dollars per share)		$ 0.0625	$ 0.0375	$ 0.1875	$ 0.0750
Homebuilding [Member]
Revenues:
Home sales		$ 2,857.9	$ 2,090.3	$ 7,417.4	$ 5,401.1
Land/lot sales		18.5	12.6	50.6	34.0
Total revenues		2,876.4	2,102.9	7,468.0	5,435.1
Cost of sales:
Home sales		2,288.9	1,658.0	5,948.8	4,227.5
Land/lot sales		16.1	10.7	44.1	27.5
Inventory impairments and land option cost write-offs		15.4	56.8	34.0	63.9
Total cost of sales		2,320.4	1,725.5	6,026.9	4,318.9
Gross profit:
Home sales		569.0	432.3	1,468.6	1,173.6
Land/lot sales		2.4	1.9	6.5	6.5
Inventory impairments and land option cost write-offs		(15.4)	(56.8)	(34.0)	(63.9)
Gross profit		556.0	377.4	1,441.1	1,116.2
Selling, general and administrative expense		257.8	221.9	738.2	593.2
Other (income)		(3.9)	(3.1)	(13.9)	(9.2)
Income (loss) before income taxes	[1]	302.1	158.6	716.8	532.2
Financial Services [Member]
Gross profit:
Financial Services Revenue		74.4	44.1	183.6	117.4
General and administrative expense		46.0	33.8	124.6	93.7
Interest and other (income)		(3.3)	(2.9)	(8.8)	(7.5)
Income (loss) before income taxes	[1]	31.7	13.2	67.8	31.2
Debt Securities [Member]
Other comprehensive income (loss), net of income tax:
Unrealized gain related to debt securities collateralized by residential real estate		$ 0.0	$ 0.0	$ 0.0	$ 0.3

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