Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net income	$ 123.2	$ 66.3
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation	7.8	4.8
Amortization of discounts and fees	10.3	10.4
Stock based compensation expense	5.4	3.5
Income tax benefit from employee stock awards	(0.9)	0
Deferred income taxes	8.1	35.2
Gain on sale of marketable securities	0	(0.2)
Inventory impairments and land option cost write-offs	2.6	1.3
Changes in operating assets and liabilities:
Increase in construction in progress and finished homes	(194.0)	(226.8)
(Increase) decrease in residential land and lots - developed, under development, and held for development	(77.3)	(612.8)
(Increase) decrease in other assets	26.1	22.8
(Increase) decrease in income taxes receivable	0	14.4
Increase in mortgage loans held for sale	95.3	37.4
Increase (decrease) in accounts payable, accrued expenses and other liabilities	(14.1)	(12.8)
Net cash used in operating activities	(7.5)	(656.5)
INVESTING ACTIVITIES
Purchases of property and equipment	(18.3)	(14.0)
Purchases of marketable securities	0	(26.8)
Proceeds from the sale or maturity of marketable securities	0	226.7
Decrease in restricted cash	(3.3)	(5.5)
Net principal increase of mortgage loans held in portfolio and real estate owned	(1.2)	(0.2)
Payments to Acquire Other Investments	0	(18.6)
Acquisition of a business	(34.5)	(9.4)
Net cash used in investing activities	(57.3)	152.2
FINANCING ACTIVITIES
Proceeds from notes payable	0	100.0
Repayment of notes payable	(55.8)	(18.4)
Proceeds from stock associated with certain employee benefit plans	3.3	2.1
Income tax benefit from employee stock awards	0.9	0
Cash dividends paid	0	(60.2)
Net cash provided by (used in) financing activities	(51.6)	23.5
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(116.4)	(480.8)
Cash and cash equivalents at beginning of period	936.5	1,047.7
Cash and cash equivalents at end of period	820.1	566.9
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