Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Gross profit:
Income before income taxes	[1]	$ 241.3	$ 220.7
Income tax expense		83.6	78.2
Net income		157.7	142.5
Other comprehensive income, net of income tax:
Comprehensive income		$ 158.9	$ 142.5
Basic net income per common share (in dollars per share)		$ 0.43	$ 0.39
Net income per common share assuming dilution (in dollars per share)		0.42	0.39
Cash dividends declared per common share (in dollars per share)		$ 0.08	$ 0.0625
Homebuilding [Member]
Revenues:
Home sales		$ 2,340.9	$ 2,240.7
Land/lot sales and other		20.2	12.3
Total revenues		2,361.1	2,253.0
Cost of sales:
Home sales		1,874.3	1,798.1
Land/lot sales and other		15.9	10.3
Inventory and land option charges		2.0	6.0
Total cost of sales		1,892.2	1,814.4
Gross profit:
Home sales		466.6	442.6
Land/lot sales and other		4.3	2.0
Inventory and land option charges		(2.0)	(6.0)
Total gross profit		468.9	438.6
Selling, general and administrative expense		243.3	238.0
Other (income)		(3.4)	(5.5)
Income before income taxes		229.0	206.1
Financial Services [Member]
Gross profit:
Revenues		55.3	49.6
General and administrative expense		46.1	37.8
Interest and other (income)		(3.1)	(2.8)
Income before income taxes		12.3	14.6
Debt Securities [Member]
Other comprehensive income, net of income tax:
Unrealized gain related to debt securities collateralized by residential real estate		$ 1.2	$ 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.