Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES
Net income	$ 290.4us-gaap_ProfitLoss	$ 254.1us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation	25.4	16.7
Amortization of discounts and fees	2.7	20.8
Stock based compensation expense	22.4us-gaap_StockOptionPlanExpense	10.8us-gaap_StockOptionPlanExpense
Income tax benefit from employee stock awards	(6.7)	(1.9)
Deferred income taxes	17.4	16.7
Inventory impairments and land option cost write-offs	18.6us-gaap_ImpairmentOfRealEstate	7.1us-gaap_ImpairmentOfRealEstate
Changes in operating assets and liabilities:
Increase in construction in progress and finished homes	(375.6)	(336.4)
(Increase) decrease in residential land and lots - developed, under development, and held for development	(71.2)	(226.8)
(Increase) decrease in other assets	(11.1)	40.2
Increase in mortgage loans held for sale	(40.7)	52.6
Increase (decrease) in accounts payable, accrued expenses and other liabilities	(40.4)	(119.7)
Net cash used in operating activities	(168.8)	(265.8)
INVESTING ACTIVITIES
Purchases of property and equipment	(24.0)	(32.8)
(Increase) decrease in restricted cash	(0.4)	(2.0)
Net principal increase of mortgage loans held in portfolio and real estate owned	(4.9)	(1.7)
Acquisition of a business	0	(34.5)
Net cash used in investing activities	(29.3)	(71.0)
FINANCING ACTIVITIES
Proceeds from notes payable	1,350.3us-gaap_ProceedsFromNotesPayable	497.0us-gaap_ProceedsFromNotesPayable
Repayment of notes payable	(1,098.3)us-gaap_RepaymentsOfNotesPayable	(163.6)us-gaap_RepaymentsOfNotesPayable
Proceeds from stock associated with certain employee benefit plans	21.0	29.6
Income tax benefit from employee stock awards	6.7	1.9
Cash dividends paid	(45.7)us-gaap_PaymentsOfDividendsCommonStock	(12.1)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by financing activities	234.0	352.8
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	35.9	16.0
Cash and cash equivalents at beginning of period	661.8	977.4
Cash and cash equivalents at end of period	697.7	993.4
Supplemental disclosures of non-cash activities:
Notes payable issued for inventory	8.1us-gaap_NotesIssued1	0us-gaap_NotesIssued1
Stock issued under Restricted Stock Unit and Performance Unit Plans	$ 8.3us-gaap_StockIssued1	$ 5.5us-gaap_StockIssued1

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

+ References

+ Details

Name:	us-gaap_StockOptionPlanExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration