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Fair Value Measurements (Tables)
9 Months Ended
Jun. 30, 2011
Fair Value Measurements [Abstract]  
Fair value measurements of assets and liabilities on a recurring basis
                             
        Fair Value at June 30, 2011
    Balance Sheet Location   Level 1     Level 2     Total  
        (In millions)  
Homebuilding:
                           
Marketable securities, available-for-sale
  Marketable securities   $ 9.1     $ 288.0     $ 297.1  
Financial Services:
                           
Mortgage loans held for sale (a)
  Mortgage loans held for sale           286.2       286.2  
Derivatives (b):
                           
Interest rate lock commitments
  Other assets           0.3       0.3  
Forward sales of MBS
  Other liabilities           (0.1 )     (0.1 )
Best-efforts and mandatory commitments
  Other assets           1.5       1.5  
 
        Fair Value at September 30, 2010
    Balance Sheet Location   Level 1     Level 2     Total  
        (In millions)  
Homebuilding:
                           
Marketable securities, available-for-sale
  Marketable securities   $ 1.0     $ 296.7     $ 297.7  
Financial Services:
                           
Mortgage loans held for sale (a)
  Mortgage loans held for sale           253.8       253.8  
Derivatives (b):
                           
Interest rate lock commitments
  Other assets           1.8       1.8  
Forward sales of MBS
  Other liabilities           (1.8 )     (1.8 )
Best-efforts and mandatory commitments
  Other assets           0.2       0.2  
 
 (a)   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.
 
 (b)   Fair value measurements of these derivatives represent changes in fair value since inception. These changes are reflected in the balance sheet and included in financial services revenues on the consolidated statement of operations.
Fair value measurements of assets on a non-recurring basis
                     
        Fair Value at   Fair Value at
        June 30, 2011   September 30, 2010
    Balance Sheet Location   Level 3   Level 3
        (In millions)
Homebuilding:
                   
Inventory held and used (a)
  Inventories   $ 20.3     $ 34.0  
Financial Services:
                   
Other mortgage loans (a)
  Other assets     30.8       27.5  
Real estate owned (a)
  Other assets     0.6       3.1  
 
 (a)   The fair values included in the table above represent only those assets whose carrying values were adjusted to fair value in the current quarter.