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Inventory Impairments and Land Option Contract Abandonments (Narratives) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2013 property | Aug. 31, 2012 property | Aug. 31, 2013 property | Aug. 31, 2012 property | Nov. 30, 2012 property
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Number of land parcels or communities evaluated for recoverability | 16 | 33 | 54 | 109 |
Pretax, noncash inventory impairment charges | $ 0 | $ 6,400,000 | $ 0 | $ 22,900,000 | $ 28,100,000
Number of land parcels or communities associated with non cash inventory impairment charges |  | 4 |  | 11 |
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges | 306,700,000 |  | 306,700,000 |  | 307,200,000
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges | 42 |  | 42 |  | 46
Land option contract abandonment charges | 0 | 0 | 284,000 | 0 |
Remaining useful life in addition to specified useful lives (in years) |  |  | 1 year |  |
Specified period of remaining useful lives (in years) |  |  | 10 years |  |
Expected Realization Period of Inventory (in years) |  |  | 5 years |  |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Post impairment fair value |  | $ 3,200,000 |  | $ 30,600,000 | $ 39,900,000

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