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Notes Payable - Narrative (Details) - USD ($)
3 Months Ended
Aug. 01, 2017
Aug. 01, 2016
Jun. 30, 2017
Sep. 30, 2016
Debt Instrument [Line Items]        
Outstanding letters of credit     $ 77,900,000  
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] | 4.75% senior notes due 2017 [Member]        
Debt Instrument [Line Items]        
Stated interest rate     4.75%  
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     584,500,000  
Mortgage loans held for sale pledged under repurchase agreement, collateral value     564,100,000  
Advance pay downs on mortgage repurchase facility     90,700,000  
Mortgage repurchase obligation outstanding     $ 473,400,000 $ 473,000,000
Interest rate on mortgage repurchase facility     3.30%  
Unsecured Debt [Member] | Homebuilding [Member]        
Debt Instrument [Line Items]        
Debt issuance costs     $ 10,300,000 13,300,000
Unsecured Debt [Member] | Homebuilding [Member] | 4.75% senior notes due 2017 [Member]        
Debt Instrument [Line Items]        
Maturities of Senior Debt     $ 350,000,000  
Stated interest rate     4.75%  
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%  
Proceeds from revolving credit facility     $ 700,000,000  
Repayments of revolving credit facility     700,000,000  
Borrowings outstanding     0 $ 0
Outstanding letters of credit     75,100,000  
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  
Subsequent Event [Member] | Homebuilding [Member]        
Debt Instrument [Line Items]        
Authorized repurchase of debt securities $ 500,000,000