Notes Payable (Details Textual) (USD $)	3 Months Ended		9 Months Ended				1 Months Ended			1 Months Ended						1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Letter of Credit One [Member]	Jun. 30, 2014 2% convertible senior notes [Member]	Jul. 24, 2013 Homebuilding [Member]	Jun. 30, 2014 Homebuilding [Member]	Sep. 30, 2013 Homebuilding [Member]	Jan. 31, 2014 Homebuilding [Member] Senior Note Five [Member]	Jun. 30, 2014 Homebuilding [Member] 3.75% senior notes due 2019 [Member]	Feb. 01, 2014 Homebuilding [Member] 3.75% senior notes due 2019 [Member]	Jun. 30, 2014 Financial Services [Member]	Sep. 30, 2013 Financial Services [Member]	Jun. 30, 2014 Maximum [Member] Financial Services [Member]	Jul. 24, 2014 Scenario, Forecast [Member] Homebuilding [Member]
Notes Payable [Abstract]
Base capacity of mortgage repurchase facility								$ 725,000,000					$ 300,000,000		$ 325,000,000
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	77,900,000		77,900,000		68,000,000
Debt Conversion, Converted Instrument, Shares Issued	77.18004
Principal amount						1,000						500,000,000
Debt Instrument, Interest Rate, Effective Percentage											3.90%
Conversion of Stock, Shares Issued	38,600,000
Debt Instrument, Convertible, Conversion Price						$ 12.96
Incremental Common Shares Attributable to Conversion of Debt Securities	14,900,000	38,600,000	30,700,000	38,600,000
Authorized repurchase of debt securities							500,000,000									500,000,000
Debt repurchase program, remaining authorized repurchase amount								500,000,000
Mortgage loans held for sale pledged under repurchase agreement													383,300,000
Mortgage loans, collateral value													367,200,000
Advance pay downs on mortgage repurchase facility													64,300,000
Assets Sold under Agreements to Repurchase, Repurchase Liability													302,900,000	238,600,000
Interest rate on mortgage repurchase facility													2.60%
Maturities of Senior Debt										$ 145,900,000