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Segment Information (Details) (USD $)
 3 Months Ended 12 Months Ended
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2011
May 31, 2011
Feb. 28, 2011
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2012
West Coast
Nov. 30, 2011
West Coast
Nov. 30, 2010
West Coast
Nov. 30, 2012
Southwest
Nov. 30, 2011
Southwest
Nov. 30, 2010
Southwest
Nov. 30, 2012
Central
Nov. 30, 2011
Central
Nov. 30, 2010
Central
Nov. 30, 2012
Southeast
Nov. 30, 2011
Southeast
Nov. 30, 2010
Southeast
Nov. 30, 2012
Corporate and Other
Nov. 30, 2011
Corporate and Other
Nov. 30, 2010
Corporate and Other
Jun. 30, 2011
KBA Mortgage
Segment Reporting Information [Line Items]                                                      
Ownership interest in joint venture                                                     50.00%
Revenues:                                                      
Total homebuilding revenues                 $ 1,548,432,000 $ 1,305,562,000 $ 1,581,763,000 $ 755,259,000 $ 589,387,000 $ 700,645,000 $ 132,438,000 $ 139,872,000 $ 187,736,000 $ 436,407,000 $ 369,705,000 $ 436,404,000 $ 224,328,000 $ 206,598,000 $ 256,978,000        
Financial services                 11,683,000 10,304,000 8,233,000                                
Total revenues 578,201,000 424,504,000 302,852,000 254,558,000 479,872,000 367,316,000 271,738,000 196,940,000 1,560,115,000 1,315,866,000 1,589,996,000                                
Pretax income (loss):                                                      
Total homebuilding pretax loss                 (89,936,000) (207,246,000) (88,511,000) (10,467,000) 19,639,000 60,250,000 (10,194,000) (108,265,000) (15,802,000) 1,449,000 (12,924,000) (1,772,000) (1,183,000) (37,983,000) (42,801,000) (69,541,000) [1] (67,713,000) [1] (88,386,000) [1]  
Financial services                 10,883,000 26,078,000 12,143,000                                
Total pretax loss 2,424,000 (7,439,000) (28,636,000) (45,402,000) 11,411,000 (9,649,000) (68,804,000) (114,126,000) (79,053,000) (181,168,000) (76,368,000)                                
Equity in income (loss) of unconsolidated joint ventures:                                                      
Total equity in income (loss) of unconsolidated joint ventures                 (394,000) (55,839,000) (6,257,000) (174,000) 68,000 1,476,000 (811,000) (55,902,000) (8,631,000) 0 0 0 591,000 (5,000) 898,000        
Inventory impairments:                                                      
Total inventory impairments 5,200,000 6,400,000 9,900,000 6,600,000 1,300,000 300,000 20,100,000 1,000,000 28,107,000 22,730,000 9,815,000 19,235,000 2,598,000 3,828,000 2,135,000 18,715,000 962,000 1,267,000 51,000 348,000 5,470,000 1,366,000 4,677,000        
Land option contract abandonments:                                                      
Total land option contract abandonment charges 400,000 0 0 0 1,000,000 800,000 500,000 800,000 426,000 3,061,000 10,110,000 0 704,000 797,000 0 296,000 0 133,000 1,310,000 6,511,000 293,000 751,000 2,802,000        
Joint venture impairments:                                                      
Total joint venture impairments                 0 53,727,000 0 0 0 0 0 53,727,000 0 0 0 0 0 0 0        
Assets:                                                      
Total homebuilding assets 2,557,243,000       2,480,369,000       2,557,243,000 2,480,369,000   930,450,000 995,888,000   319,863,000 338,586,000   369,294,000 336,553,000   341,460,000 317,308,000   596,176,000 492,034,000    
Financial services 4,455,000       32,173,000       4,455,000 32,173,000                                  
Total assets 2,561,698,000       2,512,542,000       2,561,698,000 2,512,542,000                                  
Investments in unconsolidated joint ventures:                                                      
Investments in unconsolidated joint ventures $ 123,674,000       $ 127,926,000       $ 123,674,000 $ 127,926,000   $ 38,372,000 $ 38,405,000   $ 75,920,000 $ 80,194,000   $ 0 $ 0   $ 9,382,000 $ 9,327,000          
[1] Corporate and other includes corporate general and administrative expenses.