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Financial Services (Details) (USD $)
 3 Months Ended 12 Months Ended
Nov. 30, 2013
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2010
Financial services:                        
Insurance commissions                 $ 7,177,000 $ 7,140,000 $ 7,188,000  
Title services                 3,172,000 2,362,000 1,983,000  
Marketing services fees                 1,800,000 2,175,000 1,125,000  
Interest income                 3,000 6,000 8,000  
Total                 12,152,000 11,683,000 10,304,000  
Expenses                        
Expenses                 (3,042,000) (2,991,000) (3,512,000)  
Operating income (loss)                 92,084,000 (20,256,000) (103,074,000)  
Income (Loss) from Equity Method Investments                 (933,000) 1,797,000 (36,553,000)  
Pretax income (loss) 28,316,000 26,578,000 (4,173,000) (12,358,000) 2,424,000 (7,439,000) (28,636,000) (45,402,000) 38,363,000 (79,053,000) (181,168,000)  
Assets                        
Cash and cash equivalents 532,523,000       525,688,000       532,523,000 525,688,000 418,074,000 908,430,000
Receivables 75,749,000       64,821,000       75,749,000 64,821,000    
Investments in unconsolidated joint ventures 130,192,000       123,674,000       130,192,000 123,674,000    
Other assets 107,076,000       95,050,000       107,076,000 95,050,000    
Total assets 3,193,635,000       2,561,698,000       3,193,635,000 2,561,698,000    
Liabilities                        
Accounts payable and accrued expenses 504,458,000       458,889,000       504,458,000 458,889,000    
Total liabilities 2,593,000       3,188,000       2,593,000 3,188,000    
Financial services (Textual) [Abstract]                        
Equity Method Investment, Realized Gain (Loss) on Disposal         2,100,000       1,100,000   19,800,000  
Financial services [Member]
                        
Expenses                        
Operating income (loss)                 9,110,000 8,692,000 6,792,000  
Income (Loss) from Equity Method Investments                 1,074,000 2,191,000 19,286,000  
Pretax income (loss)                 10,184,000 10,883,000 26,078,000  
Assets                        
Cash and cash equivalents 2,428,000       923,000       2,428,000 923,000 3,024,000  
Receivables 2,084,000       1,859,000       2,084,000 1,859,000    
Investments in unconsolidated joint ventures 5,490,000       1,630,000       5,490,000 1,630,000    
Other assets 38,000       43,000       38,000 43,000    
Total assets 10,040,000       4,455,000       10,040,000 4,455,000    
Liabilities                        
Accounts payable and accrued expenses $ 2,593,000       $ 3,188,000       $ 2,593,000 $ 3,188,000