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Fair Value Disclosures (Narratives) (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2012
Aug. 31, 2011
Nov. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-lived assets held and used, carrying value $ 53,500,000   $ 53,500,000   $ 56,700,000
Pretax, noncash inventory impairment charges 6,403,000 328,000 22,912,000 21,414,000 22,700,000
Fair Value, Measurements, Nonrecurring
          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-lived assets held and used     30,620,000 [1]   34,022,000 [1]
Estimate of Fair Value, Fair Value Disclosure
          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-lived assets held and used     $ 30,600,000   $ 34,000,000
[1] Amounts represent the aggregate fair values for communities or land parcels for which the Company recognized inventory impairment charges during the period, as of the date that the fair value measurements were made. The carrying value for these communities or land parcels may have subsequently increased or decreased from the fair value reflected due to activity that has occurred since the measurement date.