Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Gross profit:
Interest expense	$ 0		$ (4.2)
Income (loss) before income taxes	189.7	[1]	107.9	[1]
Income tax expense (benefit)	66.5		41.6
Net income	123.2		66.3
Other comprehensive income (loss), net of income tax:
Comprehensive income	123.2		66.2
Basic net income per common share (in dollars per share)	$ 0.38		$ 0.21
Net income per common share assuming dilution (in dollars per share)	$ 0.36		$ 0.20
Cash dividends declared per common share (in dollars per share)	$ 0.0000		$ 0.1875
Homebuilding [Member]
Revenues:
Home sales	1,630.8		1,223.3
Land/lot sales	4.8		9.9
Total revenues	1,635.6		1,233.2
Cost of sales:
Home sales	1,266.7		992.8
Land/lot sales	4.3		8.2
Inventory impairments and land option cost write-offs	2.6		1.3
Total cost of sales	1,273.6		1,002.3
Gross profit:
Home sales	364.1		230.5
Land/lot sales	0.5		1.7
Inventory impairments and land option cost write-offs	(2.6)		(1.3)
Gross profit	362.0		230.9
Selling, general and administrative expense	183.4		140.8
Interest expense	0		3.2
Other (income)	(3.3)		(3.3)
Income (loss) before income taxes	181.9	[1]	90.2	[1]
Financial Services [Member]
Gross profit:
Financial Services Revenue	35.0		41.9
General and administrative expense	29.8		25.7
Interest and other (income)	(2.6)		(1.5)
Income (loss) before income taxes	7.8	[1]	17.7	[1]
Available-for-sale Securities [Member]
Other comprehensive income (loss), net of income tax:
Unrealized loss related to available-for-sale securities	$ 0		$ (0.1)

[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.