Notes Payable (Details Textual) (USD $)	3 Months Ended				1 Months Ended			1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Letter of Credit One [Member]	Dec. 31, 2013 2% convertible senior notes [Member]	Jul. 24, 2013 Homebuilding [Member]	Dec. 31, 2013 Homebuilding [Member]	Sep. 30, 2013 Homebuilding [Member]	Jan. 31, 2014 Homebuilding [Member] Senior Note Five [Member]	Dec. 31, 2013 Financial Services [Member]	Sep. 30, 2013 Financial Services [Member]
Notes Payable [Abstract]
Base capacity of mortgage repurchase facility						$ 725,000,000			$ 300,000,000
Maximum capacity of mortgage repurchase facility						1,000,000,000			400,000,000
Letter of Credit, Maximum Borrowing Capacity						362,500,000
Line of Credit Facility, Amount Outstanding						0	0
Letters of Credit Outstanding, Amount	76,600,000		68,900,000
Debt Conversion, Converted Instrument, Shares Issued	77.18004
Principal amount				1,000
Debt Instrument, Convertible, Conversion Price				$ 12.96
Incremental Common Shares Attributable to Conversion of Debt Securities	38,600,000	38,600,000
Authorized repurchase of debt securities					500,000,000
Debt repurchase program, remaining authorized repurchase amount						500,000,000
Mortgage loans held for sale pledged under repurchase agreement									253,000,000
Mortgage loans, collateral value									238,900,000
Advance pay downs on mortgage repurchase facility									53,100,000
Assets Sold under Agreements to Repurchase, Repurchase Liability									185,800,000	238,600,000
Interest rate on mortgage repurchase facility									2.75%
Maturities of Senior Debt								$ 145,900,000