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Commitments and Contingencies (Narratives) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended |  | 9 Months Ended |
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Aug. 31, 2013 | Aug. 31, 2012 | Aug. 31, 2013 | Aug. 31, 2012 | Nov. 30, 2012 | Mar. 12, 2013 Damages from Product Defects [Member] | Aug. 31, 2013 Damages from Product Defects [Member] Lawsuit | Aug. 31, 2013 Water Intrusion [Member] Home | Aug. 31, 2013 Florida State Court Damages from Product Defects [Member] Lawsuit | Aug. 31, 2013 Class Action Lawsuits [Member] Damages from Product Defects [Member] Lawsuit
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 Associated with Water Intrustion |  |  |  |  |  |  |  | $ 23,700,000 |  |
Number of Homes Affected by Water Intrusion |  |  |  |  |  |  |  | 1,341 |  |
Accumulated number of affected homes on which repairs were resolved |  |  |  |  |  |  |  | 583 |  |
Payments Made for Repair of Homes With Water Intrusion | 12,654,000 | 5,906,000 | 30,867,000 | 14,609,000 |  |  |  | 21,400,000 |  |
Payments made as repair costs for homes with Water Intrusion |  |  |  |  |  |  |  | 25,400,000 |  |
Estimated repair costs for homes with Water Intrusion |  |  |  |  |  |  |  | 49,100,000 |  |
Number of lawsuits in which company is a defendant |  |  |  |  |  |  | 8 |  | 1 | 7
Litigation settlement, expense |  |  |  |  |  | 300,000 |  |  |  |
Adjustment to increase warranty liability | 5,931,000 | 76,000 | 23,478,000 | (11,021,000) |  |  |  |  |  |
Number Of Affected Homes, Period Increase (Decrease) |  |  |  |  |  |  |  | 201 |  |
Estimated liabilities for construction defect | 92,100,000 |  | 92,100,000 |  | 93,300,000 |  |  |  |  |
Expenses associated with self-insurance | 2,100,000 | 1,200,000 | 5,500,000 | 5,800,000 |  |  |  |  |  |
Performance bonds | 364,700,000 |  | 364,700,000 |  | 286,100,000 |  |  |  |  |
Letters of credit outstanding | 41,100,000 |  | 41,100,000 |  | 41,900,000 |  |  |  |  |
Total deposits | 44,100,000 |  | 44,100,000 |  |  |  |  |  |  |
Cash deposits | 44,043,000 |  | 44,043,000 |  | 25,682,000 |  |  |  |  |
Letters of credit | 100,000 |  | 100,000 |  | 500,000 |  |  |  |  |
Aggregate purchase price of land | 825,027,000 |  | 825,027,000 |  | 625,335,000 |  |  |  |  |
Product Liability Contingency, Loss Exposure Not Accrued, Best Estimate |  |  |  |  |  |  |  | $ 10,000,000 |  |

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