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Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Commitments and Contingencies [Abstract]        
Surety Bonds $ 999.7      
Outstanding letters of credit 97.4      
Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Liabilities for various claims, complaints and other legal actions 450.7 $ 457.6 $ 456.9 $ 482.0
Expenses related to legal claims 32.5 15.5    
Estimated insurance recoveries related to legal claims 129.6 $ 135.8 $ 138.4  
Earnest Money Deposits 67.9      
Remaining purchase price of land under option contracts $ 2,000.0      
Construction defect portion of loss contingency accrual 99.00%   99.00%  
Cash Deposits [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Earnest Money Deposits $ 59.9      
Promissory Notes and Surety Bonds [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Earnest Money Deposits 8.0      
Line of Credit [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 94.3      
Letter of Credit Two [Member]        
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 3.1      
Option Contracts Subject to Specific Performance Clauses [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Remaining purchase price of land under option contracts $ 31.1