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Commitments and Contingencies (Details Textual) (USD $)
 3 Months Ended 6 Months Ended
May 31, 2012
Home
Lawsuit
May 31, 2011
May 31, 2012
Home
Lawsuit
May 31, 2011
Feb. 29, 2012
Nov. 30, 2011
Home
Feb. 28, 2011
Nov. 30, 2010
Commitments and Contingencies (Textual) [Abstract]                
Warranty adjustment reduction of construction and land cost $ 11,200,000   $ 11,200,000          
Structural warranty provided by the company     10 years          
Maximum warranty on electrical and other building systems     5 years          
Minimum warranty on electrical and other building systems     2 years          
Warranty for other components of a home     1 year          
Company's warranty liability 50,866,000 82,630,000 50,866,000 82,630,000 64,607,000 67,693,000 87,061,000 93,988,000
Warranty liability associated with defective drywall 3,300,000   3,300,000     4,800,000    
Number of homes containing or suspected of containing defective drywall 54   54     87    
Number of affected homes on which repairs were resolved 35   35          
Additional Number of affected homes associated with repair costs 2   2          
Payments made for the repair of homes containing defective drywall     2,400,000 9,000,000        
Estimated additional charges for homes containing defective drywall     900,000 4,700,000        
Estimated repair costs for homes containing defective drywall     46,200,000          
Accumulated number of homes identified affected associated with overall warranty liability     469          
Accumulated Number of affected homes on which repairs were resolved 415   415          
Payments made as repair costs for homes containing defective drywall     42,900,000          
Number of lawsuits in which company is a defendant 11   11          
Insurance recovery as reduction to construction and land costs 10,000,000              
Company's estimated liabilities for construction defect 93,900,000   93,900,000     94,900,000    
Expenses associated with self-insurance 2,300,000 2,300,000 4,600,000 4,600,000        
Performance bonds 282,700,000   282,700,000     361,600,000    
Letters of Credit Outstanding, Amount 61,800,000   61,800,000     63,800,000    
Cash deposits 23,800,000   23,800,000     20,900,000    
Letters of credit 500,000   500,000     1,700,000    
Total deposits 24,300,000   24,300,000          
Aggregate purchase price of land $ 619,200,000   $ 619,200,000