Notes Payable (Details Textuals 1) (USD $)	3 Months Ended					12 Months Ended						1 Months Ended						12 Months Ended			12 Months Ended			12 Months Ended			3 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 Letter of credit, under revolving credit facility [Member]	Sep. 30, 2013 2% convertible senior notes due 2014, net [Member]	Sep. 30, 2012 2% convertible senior notes due 2014, net [Member]	Aug. 31, 2013 Homebuilding [Member]	Sep. 30, 2013 Homebuilding [Member]	Jul. 24, 2013 Homebuilding [Member]	Sep. 30, 2013 Homebuilding [Member] Revolving credit facility, maturing 2018 [Member]	Jun. 30, 2013 Homebuilding [Member] Revolving credit facility, maturing 2018 [Member]	Sep. 30, 2012 Homebuilding [Member] Revolving credit facility, maturing 2018 [Member]	Sep. 30, 2013 Homebuilding [Member] 4.75 senior notes due 2023 [Member]		Jan. 31, 2013 Homebuilding [Member] 4.75 senior notes due 2023 [Member]	Sep. 30, 2013 Homebuilding [Member] 3.625% senior notes due 2018 [Member]		Jan. 31, 2013 Homebuilding [Member] 3.625% senior notes due 2018 [Member]	Sep. 30, 2013 Homebuilding [Member] 5.75% senior notes due 2023 [Member]		Aug. 01, 2013 Homebuilding [Member] 5.75% senior notes due 2023 [Member]	Jun. 30, 2013 Homebuilding [Member] Senior Note Four [Member]	Sep. 30, 2012 Homebuilding [Member] Senior Note Four [Member]	Sep. 30, 2013 Homebuilding [Member] Senior Notes Redeemable Prior to Maturity [Member]	Sep. 30, 2013 Homebuilding [Member] 2% convertible senior notes due 2014, net [Member]		Sep. 30, 2013 Homebuilding [Member] Senior Notes Subject to Repurchase Upon Change of Control [Member]	Sep. 30, 2013 Homebuilding [Member] 4.75% senior notes due 2017 and 4.375% senior notes due 2022 [Member]	Sep. 30, 2013 Accelerated Dividend [Member]
Maturities of Long-term Debt [Abstract]
Maturities of notes payable in fiscal 2014						$ 1,030,800,000
Maturities of notes payable in fiscal 2015						157,700,000
Maturities of notes payable in fiscal 2016						542,900,000
Maturities of notes payable in fiscal 2017						350,000,000
Maturities of notes payable in fiscal 2018						400,000,000
Maturities of notes payable after fiscal 2018						1,050,000,000
Debt Instrument [Line Items]
Line of credit, current borrowing capacity															725,000,000	600,000,000
Line of credit, maximum borrowing capacity														1,000,000,000
Letter of credit, maximum borrowing capacity														362,500,000
Line of credit, amount outstanding															0		0
Letters of credit, amount outstanding						70,100,000			61,600,000
Senior notes, date issued																		Feb. 01, 2013			Feb. 01, 2013			Aug. 01, 2013						May 01, 2009	[1]
Senior notes, principal amount issued										1,000										300,000,000			400,000,000			400,000,000
Senior notes, stated interest rate																		4.75%			3.625%			5.75%				6.875%		2.00%
Senior notes, date due																		Feb. 15, 2023			Feb. 15, 2018			Aug. 15, 2023						May 15, 2014	[1]
Convertible senior notes, Initial conversion price										$ 12.96	$ 13.06
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities						38,600,000	38,300,000	0
Debt Instrument, Interest Rate, Effective Percentage																		4.90%	[2]		3.80%	[2]		5.90%	[2]					9.90%	[1],[2]
Principal amount																		300,000,000			400,000,000			400,000,000						500,000,000	[1]	283,800,000	1,800,000,000
Debt Instrument, Redemption Price, Percentage																													100.00%			101.00%	101.00%
Authorized repurchase of debt securities												500,000,000
Debt repurchase program, remaining authorized repurchase amount													500,000,000
Maturities of Senior Debt																											$ 171,700,000
Common Stock, Dividends, Per Share, Declared	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.1875	$ 0.15	$ 0.15																										$ 0.15
Debt Conversion, Converted Instrument, Shares Issued						77.18004	76.5697

[1] Holders of the 2% convertible senior notes may convert all or any portion of their notes at their option at any time prior to maturity. The conversion rate is subject to adjustment in certain events, which include the payment of cash dividends in excess of $0.0375 per share in any fiscal quarter, but will not be adjusted for accrued interest, including any additional interest. As a result of the cash dividend of $0.15 per share which was paid in the first quarter of fiscal 2013 (see Note I), the conversion rate of the 2% convertible senior notes increased from 76.5697 to 77.18004 shares of the Company's common stock per $1,000 principal amount of senior notes. The new conversion rate is equivalent to a conversion price of approximately $12.96 per share of common stock, compared to the initial conversion price of $13.06 per share. If all of the 2% convertible senior notes due 2014 were converted into the Company's common stock, the Company would issue 38.6 million shares of its common stock as a result of the conversion. If the convertible senior notes are eligible for conversion at maturity, the Company may redeem them with cash, shares of its common stock or a combination thereof at its election. The effective interest rate of the convertible senior notes is 9.9% after giving effect to the amortization of the discount and financing costs.

[2] Interest is payable semi-annually on each of the series of senior and convertible senior notes. The annual effective interest rate is calculated after giving effect to the amortization of the financing costs and any discount associated with the note issuance.