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Commitments and Contingencies (Details Textual) (USD $)
9 Months Ended
Jun. 30, 2012
Claims
Homeowners
Jun. 30, 2011
Sep. 30, 2011
Commitments and Contingencies [Abstract]      
Outstanding letters of credit $ 39,500,000    
Surety bonds 534,500,000    
Cash collateral on letters of credit 39,600,000   47,500,000
Homebuilding [Member]
     
Commitments and Contingencies [Abstract]      
Limited warranty for major defects in structural components and foundation systems 10 years    
Limited warranty on major mechanical systems 2 years    
Limited warranty on other construction components 1 year    
Liability related to homes containing Chinese drywall 600,000    
Proceeds from third party recoveries of warranty claims 2,400,000    
Number of Chinese Drywall lawsuits filed 4    
Number of homeowners with Chinese drywall claims, upper limit 10    
Liabilities for various claims, complaints and other legal actions 539,900,000   529,600,000
Construction defect portion of loss contingency accrual 99.00%   99.00%
Expenses related to legal claims 29,500,000 18,700,000  
Estimated insurance recoveries related to legal claims 220,800,000   218,300,000
Land option contract deposits 20,400,000    
Remaining purchase price of land under option contracts 1,300,000,000    
Land and lot option purchase contracts remaining purchase obligation subject to specific performance clauses 9,500,000    
Cash Deposits [Member] | Homebuilding [Member]
     
Commitments and Contingencies [Abstract]      
Land option contract deposits 18,900,000    
Promissory Notes and Surety Bonds [Member] | Homebuilding [Member]
     
Commitments and Contingencies [Abstract]      
Land option contract deposits $ 1,500,000