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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Sep. 30, 2011
Summary of Significant Accounting Policies [Abstract] 
Rollforward of capitalized homebuilding interest
 
                         
    Year Ended September 30,  
    2011     2010     2009  
    (In millions)  
 
Capitalized interest, beginning of year
  $ 91.5     $ 128.8     $ 160.6  
Interest incurred
    130.2       173.2       205.0  
Interest expensed:
                       
Directly to interest expense
    (50.5 )     (86.3 )     (100.2 )
Amortized to cost of sales
    (90.8 )     (122.1 )     (122.8 )
Written off with inventory impairments
    (1.2 )     (2.1 )     (13.8 )
                         
Capitalized interest, end of year
  $ 79.2     $ 91.5     $ 128.8