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Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, carrying value $ 936.5 $ 1,047.7 $ 732.6 $ 1,309.3
Notes payable, carrying value 3,509.0 2,493.1    
Homebuilding [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, carrying value 913.3 [1] 1,030.4 [1]    
Restricted cash, carrying value 77.8 [1] 49.3 [1]    
Notes payable, carrying value 3,270.4 2,305.3    
Homebuilding [Member] | Senior notes [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, carrying value 2,783.3 [2] 1,854.2 [2]    
Homebuilding [Member] | Convertible Senior Note One [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, carrying value 478.7 [2] 447.0 [2]    
Financial Services [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, carrying value 23.2 [1] 17.3 [1]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 238.6 [1] 187.8 [1]    
Level 1 [Member] | Homebuilding [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, fair value 913.3 [1] 1,030.4 [1]    
Restricted cash, fair value 77.8 [1] 49.3 [1]    
Level 1 [Member] | Financial Services [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, fair value 23.2 [1] 17.3 [1]    
Level 2 [Member] | Homebuilding [Member] | Senior notes [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, fair value 2,811.5 [2] 1,973.9 [2]    
Level 2 [Member] | Homebuilding [Member] | Convertible Senior Note One [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, fair value 762.4 [2] 821.2 [2]    
Level 3 [Member] | Financial Services [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgage repurchase facility, fair value 238.6 [1] 187.8 [1]    
Estimate fair value [Member] | Homebuilding [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, fair value 913.3 [1] 1,030.4 [1]    
Restricted cash, fair value 77.8 [1] 49.3 [1]    
Estimate fair value [Member] | Homebuilding [Member] | Senior notes [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, fair value 2,811.5 [2] 1,973.9 [2]    
Estimate fair value [Member] | Homebuilding [Member] | Convertible Senior Note One [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, fair value 762.4 [2] 821.2 [2]    
Estimate fair value [Member] | Financial Services [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, fair value 23.2 [1] 17.3 [1]    
Mortgage repurchase facility, fair value $ 238.6 [1] $ 187.8 [1]    
[1] The fair value approximates carrying value due to its short-term nature, short maturity or floating interest rate terms, as applicable.
[2] The fair value is determined based on quoted market prices of recent transactions of the notes, which is classified as Level 2 within the fair value hierarchy.