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Commitments and Contingencies (Narratives) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2012 Home | May 31, 2012 | Aug. 31, 2011 | Aug. 31, 2012 Home | Aug. 31, 2011 | Nov. 30, 2011 Home | May 31, 2011 | Nov. 30, 2010
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 |  |  |  |
Warranty liability | $ 47,326,000 | $ 50,866,000 | $ 70,499,000 | $ 47,326,000 | $ 70,499,000 | $ 67,693,000 | $ 82,630,000 | $ 93,988,000
Warranty liability associated with defective drywall | 3,000,000 |  |  | 3,000,000 |  | 4,800,000 |  |
Number of homes containing or suspected of containing defective drywall | 33 |  |  | 33 |  | 87 |  |
Number of affected homes on which repairs were resolved | 56 |  |  | 56 |  |  |  |
Additional number of affected homes associated with repair costs | 2 |  |  | 2 |  |  |  |
Payments made for the repair of homes containing defective drywall |  |  |  | 2,700,000 | 11,800,000 |  |  |
Estimated additional charges for homes containing defective drywall |  |  |  | 900,000 | 6,300,000 |  |  |
Accumulated number of homes identified affected associated with overall warranty liability |  |  |  | 469 |  |  |  |
Accumulated number of affected homes on which repairs were resolved | 436 |  |  | 436 |  |  |  |
Payments made as repair costs for homes containing defective drywall |  |  |  | 43,200,000 |  |  |  |
Estimated repair costs for homes containing defective drywall |  |  |  | 46,200,000 |  |  |  |
Warranty adjustment reduction of construction and land cost |  |  | 7,400,000 | 11,200,000 | 7,400,000 |  |  |
Insurance recovery as reduction to construction and land costs | 16,500,000 | 10,000,000 |  |  |  |  |  |
Estimated liabilities for construction defect | 93,000,000 |  |  | 93,000,000 |  | 94,900,000 |  |
Expenses associated with self-insurance | 1,200,000 |  | 2,100,000 | 5,800,000 | 6,700,000 |  |  |
Performance bonds | 290,900,000 |  |  | 290,900,000 |  | 361,600,000 |  |
Letters of credit outstanding | 45,200,000 |  |  | 45,200,000 |  | 63,800,000 |  |
Total deposits | 29,800,000 |  |  | 29,800,000 |  |  |  |
Cash deposits | 29,300,000 |  |  | 29,300,000 |  | 20,900,000 |  |
Letters of credit | 500,000 |  |  | 500,000 |  | 1,700,000 |  |
Aggregate purchase price of land | $ 599,000,000 |  |  | $ 599,000,000 |  |  |  |
Defective Drywall Material |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of lawsuits in which company is a defendant | 10 |  |  | 10 |  |  |  |
Number of omnibus class action lawsuits | 7 |  |  | 7 |  |  |  |
Florida State Court | Defective Drywall Material |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of lawsuits in which company is a defendant | 2 |  |  | 2 |  |  |  |
Louisiana Federal Court | Defective Drywall Material |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of lawsuits in which company is a defendant | 1 |  |  | 1 |  |  |  |

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