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Commitments and Contingencies (Narratives) (Details) (USD $) | 3 Months Ended |  |  | 0 Months Ended |
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Feb. 28, 2013 Home | Feb. 29, 2012 | Nov. 30, 2012 | Feb. 28, 2013 Damages from Product Defects [Member] Lawsuit | Mar. 12, 2013 Florida State Court Damages from Product Defects [Member] | Feb. 28, 2013 Florida State Court 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 | $ 15,900,000 |  |  |  |  |
Number of Homes Affected by Water Intrusion | 969 |  |  |  |  |
Accumulated number of affected homes on which repairs were resolved | 207 |  |  |  |  |
Payments Made for Repair of Homes With Water Intrusion | 5,400,000 |  |  |  |  |
Payments made as repair costs for homes containing defective drywall | 9,400,000 |  |  |  |  |
Estimated repair costs for homes containing defective drywall | 25,300,000 |  |  |  |  |
Estimated Insurance Recoveries for Water Intrusion | 9,400,000 |  |  |  |  |
Recoveries of warranty liability | 10,700,000 |  |  |  |  |
Number of lawsuits in which company is a defendant |  |  |  | 8 |  | 1
Number of omnibus class action lawsuits |  |  |  | 7 |  |
Litigation settlement, expense |  |  |  |  | 300,000 |
Adjustment to increase warranty liability | 1,674,000 | 33,000 |  |  |  |
Increase to estimated warranty costs | 12,400,000 |  |  |  |  |
Estimated liabilities for construction defect | 91,700,000 |  | 93,300,000 |  |  |
Expenses associated with self-insurance | 1,800,000 | 2,300,000 |  |  |  |
Performance bonds | 284,700,000 |  | 286,100,000 |  |  |
Letters of credit outstanding | 43,700,000 |  | 41,900,000 |  |  |
Total deposits | 21,600,000 |  |  |  |  |
Cash deposits | 21,402,000 |  | 25,682,000 |  |  |
Letters of credit | 200,000 |  | 500,000 |  |  |
Aggregate purchase price of land | $ 534,391,000 |  | $ 625,335,000 |  |  |

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