Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Gross profit:
Inventory and land option charges	$ (85.2)		$ (31.1)		$ (6.2)
Interest expense	0		7.1		26.9
Income before income taxes	814.2	[1]	657.8	[1]	242.9	[1]
Income tax expense (benefit)	280.7		195.1		(713.4)
Net income	533.5		462.7		956.3
Other comprehensive income (loss), net of income tax:
Unrealized gain (loss) related to available-for-sale securities	0.3		1.7		0.1
Comprehensive income	533.8		464.4		956.4
Basic net income per common share	$ 1.57		$ 1.44		$ 3.01
Net income per common share assuming dilution	$ 1.50		$ 1.33		$ 2.77
Cash dividends declared per common share	$ 0.1375		$ 0.1875		$ 0.15
Homebuilding [Member]
Revenues:
Home sales	7,804.7		6,024.8		4,218.4
Land/lot sales and other	53.8		61.1		17.8
Total revenues	7,858.5		6,085.9		4,236.2
Cost of sales:
Home sales	6,139.1		4,771.5		3,472.9
Land/lot sales and other	44.3		50.9		13.3
Production Related Impairments or Charges	85.2		31.1		6.2
Total cost of sales	6,268.6		4,853.5		3,492.4
Gross profit:
Home sales	1,665.6		1,253.3		745.5
Land/lot sales and other	9.5		10.2		4.5
Gross profit	1,589.9		1,232.4		743.8
Selling, general and administrative expense	834.2		649.9		528.7
Interest expense	0		5.1		23.6
Other (income)	(13.1)		(14.9)		(12.2)
Income before income taxes	768.8	[1]	592.3	[1]	203.7	[1]
Financial Services [Member]
Gross profit:
Financial Services Revenue	166.4		173.4		117.8
General and administrative expense	131.2		116.4		85.5
Interest and other income	(10.2)		(8.5)		(6.9)
Income before income taxes	45.4	[1]	65.5	[1]	39.2	[1]
Available-for-sale Securities [Member]
Other comprehensive income (loss), net of income tax:
Unrealized gain (loss) related to available-for-sale securities	0		(0.2)		0.1
Debt Securities [Member]
Other comprehensive income (loss), net of income tax:
Unrealized gain (loss) related to available-for-sale securities	$ 0.3		$ 1.9		$ 0

[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.