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Inventory Impairments and Land Option Contract Abandonments (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2013 | Aug. 31, 2012 | Aug. 31, 2013 lot | Aug. 31, 2012 | Nov. 30, 2012
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 0 |  | $ (6,400,000) |  | $ 0 |  | $ (22,900,000) |  | $ (28,100,000)
Land Option Contract Abandonment Charges | 0 |  | 0 |  | 284,000 |  | 0 |  |
Lot Option Contract Abandonments |  |  |  |  | 82 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Unobservable Input |  |  |  |  |  |  |  |  |
Average selling price | 0 | [1] | 115,000 | [1] | 0 | [1] | 115,200 | [1] |
Deliveries per month | 0 | [1] | 2 | [1] | 0 | [1] | 1 | [1] |
Discount rate | 0.00% | [1] | 17.00% | [1] | 0.00% | [1] | 17.00% | [1] |
Maximum [Member] |  |  |  |  |  |  |  |  |
Unobservable Input |  |  |  |  |  |  |  |  |
Average selling price | 0 | [1] | 246,200 | [1] | 0 | [1] | 497,900 | [1] |
Deliveries per month | 0 | [1] | 4 | [1] | 0 | [1] | 6 | [1] |
Discount rate | 0.00% | [1] | 20.00% | [1] | 0.00% | [1] | 20.00% | [1] |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Post Impairment Fair Value |  |  | $ 3,200,000 |  |  |  | $ 30,600,000 |  | $ 39,900,000
[1] | The ranges of inputs used primarily reflect the underlying variability among the various housing markets where each of the impacted communities or land parcels are located, rather than changes in prevailing market conditions.

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