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Quarterly Results (Unaudited) (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
Consolidated Quarterly Results                      
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
Gross profits 84,853,000 75,887,000 52,490,000 26,365,000 72,941,000 63,579,000 20,570,000 25,279,000      
Pretax income (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)
Net income (loss) 7,724,000 3,261,000 (24,136,000) (45,802,000) 13,911,000 (9,649,000) (68,504,000) (114,526,000) (58,953,000) (178,768,000) (69,368,000)
Basic and diluted earnings (loss) per share $ 0.10 $ 0.04 $ (0.31) $ (0.59) $ 0.18 $ (0.13) $ (0.89) $ (1.49) $ (0.76) $ (2.32) $ (0.90)
Quarterly Results (Narrative) [Abstract]                      
Pretax, noncash inventory impairment charges 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
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
Insurance recovery as reduction to construction and land costs   16,500,000 10,000,000           26,500,000    
Loss on loan guaranty             14,600,000 22,800,000 0 30,765,000 0
Gain on loan guaranty         6,600,000            
Joint ventures impairment charges               $ 53,700,000 $ 0 $ 53,700,000 $ 0