Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Gross profit:
Goodwill impairment	$ 7.2	$ 9.8	$ 0.0
Income before income taxes	1,353.5	1,123.4	814.2
Income tax expense (benefit)	467.2	372.7	280.7
Net income	886.3	750.7	533.5
Other comprehensive income (loss), net of income tax:
Unrealized gain (loss) related to available-for-sale securities	(1.4)	(0.8)	0.3
Comprehensive income	$ 884.9	$ 749.9	$ 533.8
Basic net income per common share	$ 2.39	$ 2.05	$ 1.57
Net income per common share assuming dilution	2.36	2.03	1.50
Cash dividends declared per common share	$ 0.32	$ 0.25	$ 0.1375
Homebuilding [Member]
Revenues:
Home sales	$ 11,783.1	$ 10,469.4	$ 7,804.7
Land/lot sales and other	78.7	89.6	53.8
Total revenues	11,861.8	10,559.0	7,858.5
Cost of sales:
Home sales	9,403.0	8,393.6	6,139.1
Land/lot sales and other	68.2	81.8	44.3
Production Related Impairments or Charges	31.4	60.3	85.2
Total cost of sales	9,502.6	8,535.7	6,268.6
Gross profit:
Home sales	2,380.1	2,075.8	1,665.6
Land/lot sales and other	10.5	7.8	9.5
Inventory and land option charges	(31.4)	(60.3)	(85.2)
Gross profit	2,359.2	2,023.3	1,589.9
Selling, general and administrative expense	1,100.3	1,003.0	826.9
Goodwill impairment	7.2	9.8	0.0
Other (income)	(12.7)	(7.8)	(5.5)
Income before income taxes	1,264.4	1,018.3	768.5
Financial Services [Member]
Gross profit:
Financial Services Revenue	295.6	265.0	166.4
General and administrative expense	220.0	183.0	138.5
Interest and other income	(13.5)	(23.1)	(17.8)
Income before income taxes	89.1	105.1	45.7
Debt Securities [Member]
Other comprehensive income (loss), net of income tax:
Unrealized gain (loss) related to available-for-sale securities	1.2	(0.8)	0.3
Amount reclassified from accumulated other comprehensive income	$ (2.6)	$ 0.0	$ 0.0