Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Gross profit:
Income before income taxes	[1]	$ 300.5	$ 230.1	$ 541.8	$ 450.8
Income tax expense		105.4	82.2	189.0	160.4
Net income		195.1	147.9	352.8	290.4
Other comprehensive income, net of income tax:
Comprehensive income		$ 192.5	$ 147.9	$ 351.4	$ 290.4
Basic net income per common share (in dollars per share)		$ 0.53	$ 0.40	$ 0.95	$ 0.79
Net income per common share assuming dilution (in dollars per share)		0.52	0.40	0.94	0.79
Cash dividends declared per common share (in dollars per share)		$ 0.08	$ 0.0625	$ 0.16	$ 0.125
Homebuilding [Member]
Revenues:
Home sales		$ 2,686.0	$ 2,318.8	$ 5,026.9	$ 4,559.4
Land/lot sales and other		15.0	19.7	35.2	32.1
Total revenues		2,701.0	2,338.5	5,062.1	4,591.5
Cost of sales:
Home sales		2,151.3	1,861.9	4,025.6	3,659.9
Land/lot sales and other		12.0	17.6	27.9	28.0
Inventory and land option charges		6.0	12.5	7.9	18.6
Total cost of sales		2,169.3	1,892.0	4,061.4	3,706.5
Gross profit:
Home sales		534.7	456.9	1,001.3	899.5
Land/lot sales and other		3.0	2.1	7.3	4.1
Inventory and land option charges		(6.0)	(12.5)	(7.9)	(18.6)
Total gross profit		531.7	446.5	1,000.7	885.0
Selling, general and administrative expense		258.2	242.4	501.6	480.4
Other (income)		(9.6)	(4.5)	(13.0)	(10.1)
Income before income taxes		283.1	208.6	512.1	414.7
Financial Services [Member]
Gross profit:
Revenues		66.9	59.5	122.2	109.2
General and administrative expense		51.0	40.7	97.1	78.6
Interest and other (income)		(1.5)	(2.7)	(4.6)	(5.5)
Income before income taxes		17.4	21.5	29.7	36.1
Debt Securities [Member]
Other comprehensive income, net of income tax:
Net change in unrealized gain		0.0	0.0	1.2	0.0
Amount reclassified from accumulated other comprehensive income		$ (2.6)	$ 0.0	$ (2.6)	$ 0.0

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