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Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Commitments and Contingencies [Abstract]        
Surety bonds $ 929.6      
Outstanding letters of credit 96.1      
Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Liabilities for various claims, complaints and other legal actions 426.4 $ 450.7 $ 451.0 $ 456.9
Expenses related to legal claims 34.2 32.5    
Estimated insurance recoveries related to legal claims 97.5 $ 129.6 $ 126.5  
Earnest money deposits 136.8      
Remaining purchase price of land under option contracts $ 3,400.0      
Construction defect portion of loss contingency accrual 99.00%   99.00%  
Cash [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Earnest money deposits $ 130.6      
Notes Payable, Other Payables [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Earnest money deposits 6.2      
Line of Credit [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 93.2      
Letter of Credit Two [Member]        
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 2.9      
Option Contracts Subject to Specific Performance Clauses [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Remaining purchase price of land under option contracts 34.6      
Variable Interest Entity, Not Primary Beneficiary [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Earnest money deposits $ 119.6   $ 74.4