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Commitments and Contingencies (Changes in the Warranty Liability) (Details) (USD $)
 3 Months Ended 9 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2012
Aug. 31, 2011
Changes in the Warranty Liability        
Balance at beginning of period $ 50,866,000 $ 82,630,000 $ 67,693,000 $ 93,988,000
Warranties issued 2,290,000 1,255,000 5,263,000 3,236,000
Payments (5,906,000) (6,012,000) (14,609,000) (20,483,000)
Adjustments 76,000 [1] (7,374,000) [1] (11,021,000) [1] (6,242,000) [1]
Balance at end of period 47,326,000 70,499,000 47,326,000 70,499,000
Warranty adjustment reduction of construction and land cost   $ 7,400,000 $ 11,200,000 $ 7,400,000
[1] The Company’s warranty adjustments for the nine months ended August 31, 2012 include $11.2 million of adjustments that were recorded to reflect the Company’s assessment of trends in its overall warranty claims experience on homes previously delivered. The Company's warranty adjustments for the nine months and three months ended August 31, 2011 include $7.4 million of adjustments that also resulted from the Company's assessment of trends in its overall warranty claims experience on homes previously delivered.