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Commitments and Contingencies (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |
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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 |  |  |  |  |

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