Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES
Net income	$ 533.5	$ 462.7	$ 956.3
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and Amortization	38.4	22.7	18.8
Amortization of discounts and fees	27.4	39.7	40.4
Stock based compensation expense	26.2	19.0	18.1
Income tax benefit from stock option exercises	(0.6)	(6.7)	0
Deferred income taxes	17.4	130.9	(709.5)
(Gain) loss on early retirement of debt, net	0	0	(0.1)
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	0	(0.2)	(0.2)
Inventory impairments and land option charges	85.2	31.1	6.2
Changes in operating assets and liabilities:
(Increase) decrease in construction in progress and finished homes	(918.2)	(815.3)	(275.4)
(Increase) decrease in residential land and lots - developed, under development, and held for development	(513.6)	(1,235.6)	(371.0)
(Increase) decrease in other assets	8.8	18.3	(36.2)
(Increase) decrease in income taxes receivable	0	14.4	(2.0)
Increase in mortgage loans held for sale	(81.8)	(49.8)	(51.2)
Increase (decrease) in accounts payable, accrued expenses and other liabilities	115.9	139.5	113.6
Net cash (used in) provided by operating activities	(661.4)	(1,229.3)	(292.2)
INVESTING ACTIVITIES
Purchases of property and equipment	(100.2)	(58.0)	(33.6)
Purchases of marketable securities	0	(28.9)	(240.8)
Proceeds from the sale or maturity of marketable securities	0	325.4	232.8
(Increase) decrease in restricted cash	67.8	(28.5)	(0.2)
Net principal increase of other mortgage loans and real estate owned	(5.6)	(2.5)	(4.7)
Purchases of debt securities collateralized by residential real estate	0	(18.6)	0
Principal payments received on debt securities collateralized by residential real estate	0	1.4	0
Payments related to acquisition of a business	(244.1)	(9.4)	(96.5)
Net cash used in investing activities	(282.1)	180.9	(143.0)
FINANCING ACTIVITIES
Proceeds from notes payable	1,427.6	1,307.9	765.9
Repayment of notes payable	(796.9)	(345.1)	(17.5)
Proceeds from stock associated with certain employee benefit plans	45.2	29.7	50.9
Income tax benefit from stock option exercises	0.6	6.7	0
Cash dividends paid	(48.6)	(60.2)	(47.8)
Net cash provided by (used in) financing activities	627.9	939.0	751.5
Increase (decrease) in cash and cash equivalents	(315.6)	(109.4)	316.3
Cash and cash equivalents at beginning of year	977.4	1,086.8	770.5
Cash and cash equivalents at end of year	661.8	977.4	1,086.8
Supplemental cash flow information:
Interest paid, net of amounts capitalized	0	5.6	19.5
Income taxes paid (refunded), net	279.8	34.8	6.1
Supplemental disclosures of non-cash activities:
Notes payable issued for inventory	0	11.4	4.1
Stock issued under Performance Unit Plan	5.5	3.9	3.1
Conversion of 2% convertible senior notes into equity	498.6	0	0
Notes Assumed	18.6	0	0
Note receivable related to sale of land	5.0	0	0
Accrual for holdback payment related to acquisition	$ 0	$ 0	$ 9.4