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Notes Payable (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Aug. 01, 2014
Jul. 31, 2015
Mar. 31, 2015
Jun. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]          
Letters of Credit Outstanding, Amount       $ 97,400,000  
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] | Senior Note Member Thirty [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       4.00%  
Homebuilding [Member] | Senior Note Seven [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       5.25%  
Homebuilding [Member] | 3.75% senior notes due 2019 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       3.75%  
Homebuilding [Member] | Senior Note Eight [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       5.625%  
Homebuilding [Member] | Senior Note Nine [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       6.50%  
Homebuilding [Member] | Senior Note Twenty Four [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       4.75%  
Homebuilding [Member] | Senior Note Twenty Six [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       3.625%  
Homebuilding [Member] | Senior Note Twenty Seven [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       4.75%  
Homebuilding [Member] | SeniorNoteTwentyEight [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       5.75%  
Financial Services [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Current Borrowing Capacity       $ 400,000,000  
Line of Credit Facility, Maximum Borrowing Capacity       550,000,000  
Line of credit facility additional borrowing capacity       450,000,000  
Mortgage loans held for sale pledged under repurchase agreement       518,400,000  
Mortgage loans, collateral value       501,200,000  
Advance pay downs on mortgage repurchase facility       53,200,000  
Assets Sold under Agreements to Repurchase, Repurchase Liability       $ 448,000,000 $ 359,200,000
Interest rate on mortgage repurchase facility       2.40%  
Line of Credit [Member] | Homebuilding [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Current Borrowing Capacity       $ 975,000,000  
Line of Credit Facility, Maximum Borrowing Capacity       1,250,000,000  
Letter of Credit, Maximum Borrowing Capacity       0.50  
Line of Credit Facility, Amount Outstanding       0 $ 300,000,000
Letters of Credit Outstanding, Amount       $ 94,300,000  
Unsecured Debt [Member] | Homebuilding [Member] | Senior Note Member Thirty [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount     $ 500,000,000    
Debt Instrument, Interest Rate, Effective Percentage     4.20%    
Unsecured Debt [Member] | Homebuilding [Member] | Senior Note Seven [Member]          
Debt Instrument [Line Items]          
Maturities of Senior Debt     $ 157,700,000    
Scenario, Forecast [Member] | Homebuilding [Member]          
Debt Instrument [Line Items]          
Authorized repurchase of debt securities   $ 500,000,000