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Commitments and Contingencies (Details Textual) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Commitments and Contingencies [Abstract]        
Surety Bonds $ 748.3      
Outstanding letters of credit 75.2      
Homebuilding [Member]
       
Commitments and Contingencies [Abstract]        
Liabilities for various claims, complaints and other legal actions 454.2 519.7 482.0 544.9
Expenses related to legal claims 5.4 15.0    
Estimated insurance recoveries related to legal claims 136.1 195.8 162.1  
Earnest Money Deposits 41.3      
Remaining purchase price of land under option contracts 1,800.0      
Restricted Cash and Cash Equivalents 79.8   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 34.1      
Promissory Notes and Surety Bonds [Member] | Homebuilding [Member]
       
Commitments and Contingencies [Abstract]        
Earnest Money Deposits 7.2      
Letter of Credit Two [Member]
       
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 4.7      
Letter of Credit [Member]
       
Commitments and Contingencies [Abstract]        
Restricted Cash and Cash Equivalents 75.2   73.6  
Letter of Credit One [Member]
       
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 70.5      
Option Contracts Subject to Specific Performance Clauses [Member] | Homebuilding [Member]
       
Commitments and Contingencies [Abstract]        
Remaining purchase price of land under option contracts $ 11.6