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Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Commitments and Contingencies [Abstract]        
Surety bonds $ 1,000.0      
Outstanding letters of credit 94.2      
Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Liabilities for various claims, complaints and other legal actions 426.2 $ 449.4 $ 451.0 $ 456.9
Expenses related to legal claims 19.9 20.4    
Estimated insurance recoveries related to legal claims 100.5 $ 134.1 $ 126.5  
Earnest money deposits 108.7      
Remaining purchase price of land under option contracts $ 3,000.0      
Construction defect portion of loss contingency accrual 99.00%   99.00%  
Cash Deposits [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Earnest money deposits $ 104.6      
Promissory Notes and Surety Bonds [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Earnest money deposits 4.1      
Line of Credit [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 91.1      
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 33.0      
Variable Interest Entity, Not Primary Beneficiary [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Earnest money deposits $ 103.2   $ 74.4