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Notes Payable (Details Textual) - USD ($)
3 Months Ended
Apr. 15, 2016
Aug. 01, 2015
Mar. 31, 2016
Sep. 30, 2015
Debt Instrument [Line Items]        
Outstanding letters of credit     $ 94,200,000  
Homebuilding [Member]        
Debt Instrument [Line Items]        
Authorized repurchase of debt securities   $ 500,000,000    
Debt repurchase program, remaining authorized repurchase amount     $ 500,000,000  
Homebuilding [Member] | 5.625% senior notes due 2016 [Member]        
Debt Instrument [Line Items]        
Stated interest rate     5.625%  
Homebuilding [Member] | 6.5% senior notes due 2016 [Member]        
Debt Instrument [Line Items]        
Stated interest rate     6.50%  
Financial Services [Member]        
Debt Instrument [Line Items]        
Borrowing capacity on revolving credit facility     $ 475,000,000  
Maximum borrowing capacity on revolving credit facility     650,000,000  
Line of credit facility additional borrowing capacity     550,000,000  
Mortgage loans held for sale pledged under repurchase agreement     564,700,000  
Mortgage loans, collateral value     545,800,000  
Advance pay downs on mortgage repurchase facility     50,400,000  
Mortgage repurchase obligation outstanding     $ 495,400,000 $ 477,900,000
Interest rate on mortgage repurchase facility     2.60%  
Unsecured Debt [Member] | Homebuilding [Member]        
Debt Instrument [Line Items]        
Debt issuance costs     $ 15,200,000 17,300,000
Unsecured Debt [Member] | Homebuilding [Member] | 5.625% senior notes due 2016 [Member]        
Debt Instrument [Line Items]        
Remaining unpaid principal amount     $ 170,200,000  
Stated interest rate     5.625%  
Unsecured Debt [Member] | Homebuilding [Member] | 6.5% senior notes due 2016 [Member]        
Debt Instrument [Line Items]        
Stated interest rate     6.50%  
Line of Credit [Member] | Homebuilding [Member]        
Debt Instrument [Line Items]        
Borrowing capacity on revolving credit facility     $ 975,000,000  
Maximum borrowing capacity on revolving credit facility     1,250,000,000  
Letters of credit, sublimit borrowing capacity, as a percentage     0.50  
Borrowings outstanding     0 $ 0
Outstanding letters of credit     $ 91,100,000  
Subsequent Event [Member] | Unsecured Debt [Member] | Homebuilding [Member] | 6.5% senior notes due 2016 [Member]        
Debt Instrument [Line Items]        
Remaining unpaid principal amount $ 372,700,000