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Notes Payable - Narrative (Details) - USD ($)
Aug. 01, 2016
Mar. 31, 2017
Sep. 30, 2016
Debt Instrument [Line Items]      
Outstanding letters of credit   $ 78,700,000  
Homebuilding [Member]      
Debt Instrument [Line Items]      
Authorized repurchase of debt securities $ 500,000,000    
Debt repurchase program, remaining authorized repurchase amount   500,000,000  
Financial Services and Other [Member]      
Debt Instrument [Line Items]      
Borrowing capacity on revolving credit facility   600,000,000  
Maximum borrowing capacity on revolving credit facility   1,000,000,000  
Mortgage loans held for sale pledged under repurchase agreement   528,400,000  
Mortgage loans, collateral value   509,700,000  
Advance pay downs on mortgage repurchase facility   90,700,000  
Mortgage repurchase obligation outstanding   $ 419,000,000 $ 473,000,000
Interest rate on mortgage repurchase facility   3.10%  
Unsecured Debt [Member] | Homebuilding [Member]      
Debt Instrument [Line Items]      
Debt issuance costs   $ 11,300,000 13,300,000
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   50.00%  
Borrowings outstanding   $ 0 $ 0
Outstanding letters of credit   75,400,000  
Weighted Average [Member] | Financial Services and Other [Member]      
Debt Instrument [Line Items]      
Borrowing capacity on revolving credit facility   725,000,000  
Maximum [Member] | Financial Services and Other [Member]      
Debt Instrument [Line Items]      
Borrowing capacity on revolving credit facility   $ 800,000,000