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Notes Payable (Details Textuals 1) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2015
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Maturities of Long-term Debt [Abstract]        
Maturities of notes payable in fiscal 2015     $ 1,000,000,000  
Maturities of notes payable in fiscal 2016     351,500,000  
Maturities of notes payable in fiscal 2017     400,900,000  
Maturities of notes payable in fiscal 2018     500,000,000  
Maturities of notes payable in fiscal 2019     500,000,000  
Maturities of notes payable after fiscal 2019     1,100,000,000  
Debt Instrument [Line Items]        
Letters of credit, amount outstanding     113,000,000  
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities       38,600,000
Debt Conversion, Converted Instrument, Shares Issued       38,589,451
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] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense     17,300,000 $ 17,100,000
Homebuilding [Member] | Revolving credit facility, maturing 2018 [Member]        
Debt Instrument [Line Items]        
Line of credit, current borrowing capacity     975,000,000  
Line of credit, maximum borrowing capacity     1,250,000,000  
Letter of Credit, Maximum Borrowing Capacity     0.50  
Line of credit, amount outstanding     0 [1] $ 300,000,000
Letters of credit, amount outstanding     $ 109,900,000  
SeniorNoteTwentyEight [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Senior notes, date issued     Aug. 01, 2013  
Senior notes, stated interest rate     5.75%  
Senior notes, date due     Aug. 15, 2023  
Debt Instrument, Call Feature [2]     Yes  
Debt Instrument, Interest Rate, Effective Percentage [3]     5.90%  
Principal amount     $ 400,000,000  
Senior Note Member Twenty Five [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Senior notes, date issued     Sep. 01, 2012  
Senior notes, stated interest rate     4.375%  
Senior notes, date due     Sep. 15, 2022  
Debt Instrument, Call Feature [2]     Yes  
Debt Instrument, Interest Rate, Effective Percentage [3]     4.50%  
Principal amount     $ 350,000,000  
Senior Note Twenty Seven [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Senior notes, date issued     Feb. 01, 2013  
Senior notes, stated interest rate     4.75%  
Senior notes, date due     Feb. 15, 2023  
Debt Instrument, Call Feature [2]     Yes  
Debt Instrument, Interest Rate, Effective Percentage [3]     4.90%  
Principal amount     $ 300,000,000  
Senior Note Seven [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Senior notes, stated interest rate     5.25%  
Maturities of Senior Debt   $ 157,700,000    
Senior Note Eight [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Senior notes, date issued     Dec. 01, 2004  
Senior notes, stated interest rate     5.625%  
Senior notes, date due     Jan. 15, 2016  
Debt Instrument, Call Feature [2]     Yes  
Debt Instrument, Interest Rate, Effective Percentage [3]     5.80%  
Principal amount     $ 170,200,000  
Senior Note Nine [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Senior notes, date issued     Apr. 01, 2006  
Senior notes, stated interest rate     6.50%  
Senior notes, date due     Apr. 15, 2016  
Debt Instrument, Call Feature [2]     Yes  
Debt Instrument, Interest Rate, Effective Percentage [3]     6.60%  
Principal amount     $ 372,700,000  
Senior Note Twenty Four [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Senior notes, date issued     May 01, 2012  
Senior notes, stated interest rate     4.75%  
Senior notes, date due     May 15, 2017  
Debt Instrument, Call Feature [2]     Yes  
Debt Instrument, Interest Rate, Effective Percentage [3]     5.00%  
Principal amount     $ 350,000,000  
Senior Note Twenty Six [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Senior notes, date issued     Feb. 01, 2013  
Senior notes, stated interest rate     3.625%  
Senior notes, date due     Feb. 15, 2018  
Debt Instrument, Call Feature [2]     Yes  
Debt Instrument, Interest Rate, Effective Percentage [3]     3.80%  
Principal amount     $ 400,000,000  
Senior Note Twenty Nine [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Senior notes, date issued     Feb. 01, 2014  
Senior notes, stated interest rate     3.75%  
Senior notes, date due     Mar. 01, 2019  
Debt Instrument, Call Feature [2]     Yes  
Debt Instrument, Interest Rate, Effective Percentage [3]     3.90%  
Principal amount     $ 500,000,000  
Senior Note Member Thirty [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Senior notes, date issued     Feb. 01, 2015  
Senior notes, principal amount issued   $ 500,000,000    
Senior notes, stated interest rate     4.00%  
Senior notes, date due     Feb. 15, 2020  
Debt Instrument, Call Feature [2]     Yes  
Debt Instrument, Interest Rate, Effective Percentage [3]     4.20%  
Principal amount     $ 500,000,000  
Senior Notes Redeemable Prior to Maturity [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Redemption Price, Percentage     100.00%  
Senior Notes Subject to Repurchase Upon Change of Control and Ratings Downgrade [Member] | Homebuilding [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Principal amount     $ 2,800,000,000  
Debt Instrument, Redemption Price, Percentage     101.00%  
[1] The fair value approximates carrying value due to its short-term nature, short maturity or floating interest rate terms, as applicable.
[2] Interest is payable semi-annually on each of the series of senior notes. The annual effective interest rate is calculated after giving effect to the amortization of the financing costs and any discount associated with the note issuance.
[3] The Company may redeem the notes in whole at any time or in part from time to time, at a redemption price equal to the greater of 100% of their principal amount or the present value of the remaining scheduled payments on the redemption date, plus accrued interest.