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Commitments and Contingencies (Narratives) (Details) (USD $)
 3 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Nov. 30, 2013
Loss Contingencies [Line Items]      
Structural warranty provided by the company (in years) 10 years    
Minimum warranty on electrical and other building systems (in years) 2 years    
Maximum warranty on electrical and other building systems (in years) 5 years    
Warranty for other components of a home (in years) 1 year    
Payments $ (8,711,000) $ (8,929,000)  
Adjustment to increase warranty liability 0 1,674,000  
Performance bonds 427,000,000   410,800,000
Letters of credit outstanding 41,700,000   41,500,000
Total deposits 55,700,000    
Cash deposits 55,634,000   41,565,000
Letters of credit 100,000   100,000
Aggregate purchase price of land 1,090,566,000   1,151,496,000
Water Intrusion [Member]
      
Loss Contingencies [Line Items]      
Warranty Liability Associated with Water Intrusion 22,900,000   28,900,000
Number of Homes Affected by Water Intrusion 352   710
Number of Affected Homes on which Repairs Were Resolved 371    
Accumulated number of affected homes on which repairs were resolved 1,125    
Payments (6,000,000) (5,400,000)  
Accumulated Number of Affected Homes 1,477    
Payments made as repair costs for homes with Water Intrusion 42,700,000    
Estimated repair costs for homes with Water Intrusion 65,600,000    
Number of Affected Attached Home Communities 2    
Number Of Affected Homes, Period Increase (Decrease) 13    
Product Liability Contingency, Loss Exposure Not Accrued, Best Estimate $ 6,000,000