Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Gross profit:
Interest expense	$ 0		$ 0		$ 0		$ 7.1
Income (loss) before income taxes	171.8	[1]	205.1	[1]	563.4	[1]	455.1	[1]
Income tax expense (benefit)	58.7		59.1		196.1		131.9
Net income	113.1		146.0		367.3		323.2
Other comprehensive income (loss), net of income tax:
Comprehensive income	113.1		147.9		367.6		324.9
Basic net income per common share (in dollars per share)	$ 0.32		$ 0.45		$ 1.10		$ 1.00
Net income per common share assuming dilution (in dollars per share)	$ 0.32		$ 0.42		$ 1.05		$ 0.93
Cash dividends declared per common share (in dollars per share)	$ 0.0375		$ 0.0000		$ 0.0750		$ 0.1875
Homebuilding [Member]
Revenues:
Home sales	2,090.3		1,630.8		5,401.1		4,222.8
Land/lot sales	12.6		13.7		34.0		45.3
Total revenues	2,102.9		1,644.5		5,435.1		4,268.1
Cost of sales:
Home sales	1,658.0		1,281.5		4,227.5		3,364.2
Land/lot sales	10.7		13.1		27.5		38.8
Inventory impairments and land option cost write-offs	56.8		0.8		63.9		4.0
Total cost of sales	1,725.5		1,295.4		4,318.9		3,407.0
Gross profit:
Home sales	432.3		349.3		1,173.6		858.6
Land/lot sales	1.9		0.6		6.5		6.5
Inventory impairments and land option cost write-offs	(56.8)		(0.8)		(63.9)		(4.0)
Gross profit	377.4		349.1		1,116.2		861.1
Selling, general and administrative expense	221.9		167.5		593.2		463.3
Interest expense	0		0		0		5.1
Other (income)	(3.1)		(3.8)		(9.2)		(10.3)
Income (loss) before income taxes	158.6	[1]	185.4	[1]	532.2	[1]	403.0	[1]
Financial Services [Member]
Gross profit:
Financial Services Revenue	44.1		48.3		117.4		131.3
General and administrative expense	33.8		31.3		93.7		84.9
Interest and other (income)	(2.9)		(2.7)		(7.5)		(5.7)
Income (loss) before income taxes	13.2	[1]	19.7	[1]	31.2	[1]	52.1	[1]
Available-for-sale Securities [Member]
Other comprehensive income (loss), net of income tax:
Unrealized gain (loss) related to available-for-sale and debt securities	0		0		0		(0.2)
Debt Securities [Member]
Other comprehensive income (loss), net of income tax:
Unrealized gain (loss) related to available-for-sale and debt securities	$ 0		$ 1.9		$ 0.3		$ 1.9

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