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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Homebuilding [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments $ 20.3 $ 0
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale 0 298.0
Financial Services [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Mortgage loans held for sale 395.1 345.3
Recurring [Member] | Level 1 [Member] | Homebuilding [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments 0 [1]  
Recurring [Member] | Level 1 [Member] | Homebuilding [Member] | U.S. Treasury securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   75.7
Recurring [Member] | Level 1 [Member] | Homebuilding [Member] | Government agency and corporate debt securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   0
Recurring [Member] | Level 1 [Member] | Homebuilding [Member] | Certificates of deposit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   0
Recurring [Member] | Level 1 [Member] | Financial Services [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Mortgage loans held for sale 0 [2] 0 [2]
Recurring [Member] | Level 1 [Member] | Financial Services [Member] | Interest rate lock commitments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives 0 [3] 0 [3]
Recurring [Member] | Level 1 [Member] | Financial Services [Member] | Forward Sales Of MBS [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives 0 [3] 0 [3]
Recurring [Member] | Level 1 [Member] | Financial Services [Member] | Best-efforts and mandatory commitments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives 0 [3] 0 [3]
Recurring [Member] | Level 2 [Member] | Homebuilding [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments 0 [1]  
Recurring [Member] | Level 2 [Member] | Homebuilding [Member] | U.S. Treasury securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   0
Recurring [Member] | Level 2 [Member] | Homebuilding [Member] | Government agency and corporate debt securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   212.3
Recurring [Member] | Level 2 [Member] | Homebuilding [Member] | Certificates of deposit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   10.0
Recurring [Member] | Level 2 [Member] | Financial Services [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Mortgage loans held for sale 389.4 [2] 345.3 [2]
Recurring [Member] | Level 2 [Member] | Financial Services [Member] | Interest rate lock commitments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives 7.0 [3] 6.1 [3]
Recurring [Member] | Level 2 [Member] | Financial Services [Member] | Forward Sales Of MBS [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives (8.8) [3] (6.9) [3]
Recurring [Member] | Level 2 [Member] | Financial Services [Member] | Best-efforts and mandatory commitments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives (3.1) [3] (0.8) [3]
Recurring [Member] | Level 3 [Member] | Homebuilding [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments 20.3 [1] 0 [1]
Recurring [Member] | Level 3 [Member] | Homebuilding [Member] | U.S. Treasury securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   0
Recurring [Member] | Level 3 [Member] | Homebuilding [Member] | Government agency and corporate debt securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   0
Recurring [Member] | Level 3 [Member] | Homebuilding [Member] | Certificates of deposit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   0
Recurring [Member] | Level 3 [Member] | Financial Services [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Mortgage loans held for sale 5.7 [2] 0 [2]
Recurring [Member] | Level 3 [Member] | Financial Services [Member] | Interest rate lock commitments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives 0 0 [3]
Recurring [Member] | Level 3 [Member] | Financial Services [Member] | Forward Sales Of MBS [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives 0 0 [3]
Recurring [Member] | Level 3 [Member] | Financial Services [Member] | Best-efforts and mandatory commitments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives 0 0 [3]
Recurring [Member] | Estimate fair value [Member] | Homebuilding [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments 20.3 [1]  
Recurring [Member] | Estimate fair value [Member] | Homebuilding [Member] | U.S. Treasury securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   75.7
Recurring [Member] | Estimate fair value [Member] | Homebuilding [Member] | Government agency and corporate debt securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   212.3
Recurring [Member] | Estimate fair value [Member] | Homebuilding [Member] | Certificates of deposit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Marketable securities, available-for-sale   10.0
Recurring [Member] | Estimate fair value [Member] | Financial Services [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Mortgage loans held for sale 395.1 [2] 345.3 [2]
Recurring [Member] | Estimate fair value [Member] | Financial Services [Member] | Interest rate lock commitments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives 7.0 [3] 6.1
Recurring [Member] | Estimate fair value [Member] | Financial Services [Member] | Forward Sales Of MBS [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives (8.8) [3] (6.9)
Recurring [Member] | Estimate fair value [Member] | Financial Services [Member] | Best-efforts and mandatory commitments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Fair value of interest rate derivatives $ (3.1) [3] $ (0.8)
[1] In October 2012, the Company purchased $18.6 million of defaulted debt securities which are secured by residential real estate. The Company intends to foreclose on the property or negotiate an agreement to obtain the right to take possession of the residential real estate in order to develop the property and ultimately build and sell homes. These securities, which are included in other assets on the consolidated balance sheets, are classified as available for sale and are reflected at fair value. The fair value of these securities was determined by estimating the future cash flows of the securities and the residential real estate utilizing discount rates of 6% and 18%, respectively. Unrealized gains or losses on these securities, net of tax, are recorded in accumulated other comprehensive income (loss) on the consolidated balance sheets.
[2] Mortgage loans held for sale are reflected at fair value. Interest income earned on mortgage loans held for sale is based on contractual interest rates and included in financial services interest and other (income) expense. Mortgage loans held for sale at September 30, 2013 includes $5.7 million of originated loans for which the Company elected the fair value option upon origination and for which the Company has not sold into the secondary market, but plans to sell as market conditions permit. The fair value of these mortgage loans held for sale is generally calculated considering the secondary market and adjusted for the value of the underlying collateral, including interest rate risk, liquidity risk and prepayment risk; therefore, they were transferred from a Level 2 valuation to a Level 3 valuation during fiscal 2013.
[3] Fair value measurements of these derivatives represent changes in fair value since inception and are reflected in the balance sheet. Changes in these fair values during the periods presented are included in financial services revenues on the consolidated statement of operations.