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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.