Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
OPERATING ACTIVITIES
Net income	$ 367.3	$ 323.2
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation	26.6	16.0
Amortization of discounts and fees	25.4	29.7
Stock based compensation expense	17.6	13.1
Income tax benefit from employee stock awards	(1.6)	0
Deferred income taxes	3.8	79.5
Gain on sale of marketable securities	0	(0.2)
Inventory impairments and land option cost write-offs	63.9	4.0
Changes in operating assets and liabilities:
Increase in construction in progress and finished homes	(759.4)	(692.1)
(Increase) decrease in residential land and lots - developed, under development, and held for development	(327.8)	(1,046.5)
(Increase) decrease in other assets	34.8	(7.1)
(Increase) decrease in income taxes receivable	0	14.4
Increase in mortgage loans held for sale	(24.1)	(12.9)
Increase (decrease) in accounts payable, accrued expenses and other liabilities	(1.6)	142.6
Net cash used in operating activities	(575.1)	(1,136.3)
INVESTING ACTIVITIES
Purchases of property and equipment	(49.9)	(40.6)
Purchases of marketable securities	0	(28.9)
Proceeds from the sale or maturity of marketable securities	0	325.4
(Increase) decrease in restricted cash	57.7	(19.3)
Net principal increase of mortgage loans held in portfolio and real estate owned	(2.8)	(1.0)
Payments to Acquire Other Investments	0	(18.6)
Principal payments received on debt securities collateralized by residential real estate	0	1.4
Acquisition of a business	(222.7)	(9.4)
Net cash used in investing activities	(217.7)	209.0
FINANCING ACTIVITIES
Proceeds from notes payable	686.3	892.0
Repayment of notes payable	(273.9)	(342.1)
Proceeds from stock associated with certain employee benefit plans	43.1	27.9
Income tax benefit from employee stock awards	1.6	0
Cash dividends paid	(25.8)	(60.2)
Net cash provided by financing activities	431.3	517.6
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(361.5)	(409.7)
Cash and cash equivalents at beginning of period	936.5	1,047.7
Cash and cash equivalents at end of period	575.0	638.0
Supplemental disclosures of non-cash activities:
Notes payable issued for inventory	0	11.4
Stock issued under Restricted Stock Unit and Performance Unit Plans	5.5	3.9
Note receivable related to sale of land	5.0	0
Conversion of 2% convertible senior notes into equity	498.6	0
Accrual for holdback payment related to acquisition	$ 21.4	$ 0