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Commitments and Contingencies (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Sep. 30, 2012
Commitments and Contingencies [Abstract]        
Surety Bonds $ 736.1      
Outstanding letters of credit 76.6      
Homebuilding [Member]
       
Commitments and Contingencies [Abstract]        
Liabilities for various claims, complaints and other legal actions 469.6 529.8 482.0 544.9
Expenses related to legal claims 5.5 14.2    
Estimated insurance recoveries related to legal claims 148.1 202.0 162.1  
Earnest Money Deposits 43.8      
Remaining purchase price of land under option contracts 1,900.0      
Restricted Cash and Cash Equivalents 81.1   77.8  
Construction defect portion of loss contingency accrual 99.00%   99.00%  
Cash Deposits [Member] | Homebuilding [Member]
       
Commitments and Contingencies [Abstract]        
Earnest Money Deposits 36.9      
Promissory Notes and Surety Bonds [Member] | Homebuilding [Member]
       
Commitments and Contingencies [Abstract]        
Earnest Money Deposits 6.9      
Letter of Credit Two [Member]
       
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 7.7      
Letter of Credit [Member]
       
Commitments and Contingencies [Abstract]        
Restricted Cash and Cash Equivalents 77.3   73.6  
Letter of Credit One [Member]
       
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 68.9      
Option Contracts Subject to Specific Performance Clauses [Member] | Homebuilding [Member]
       
Commitments and Contingencies [Abstract]        
Remaining purchase price of land under option contracts $ 13.1