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Fair Value Disclosures (Details Textual) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Nov. 30, 2011
Additional Fair Value Disclosures (Textual) [Abstract]          
Pretax, noncash inventory impairment charges $ 9,937,000 $ 20,094,000 $ 16,509,000 $ 21,086,000 $ 22,700,000
Fair Value Disclosures (Textual) [Abstract]          
Long-lived assets held and used, Carrying Value 43,900,000   43,900,000   56,700,000
Fair Value, Measurements, Nonrecurring [Member]
         
Additional Fair Value Disclosures (Textual) [Abstract]          
Long-lived assets held and used     27,396,000   34,022,000
Estimate of Fair Value, Fair Value Disclosure [Member]
         
Additional Fair Value Disclosures (Textual) [Abstract]          
Long-lived assets held and used     $ 27,400,000   $ 34,000,000
Senior notes due 2014 at 5 3/4% [Member]
         
Debt Instrument [Line Items]          
Senior notes, rate 5.75%   5.75%    
Senior notes due 2015 at 5 7/8% [Member]
         
Debt Instrument [Line Items]          
Senior notes, rate 5.875%   5.875%    
Senior notes due 2015 at 6 1/4% [Member]
         
Debt Instrument [Line Items]          
Senior notes, rate 6.25%   6.25%    
Senior notes due 2017 at 9.10% [Member]
         
Debt Instrument [Line Items]          
Senior notes, rate 9.10%   9.10%    
Senior notes due 2018 at 7 1/4% [Member]
         
Debt Instrument [Line Items]          
Senior notes, rate 7.25%   7.25%    
Senior notes due 2020 at 8.00% [Member]
         
Debt Instrument [Line Items]          
Senior notes, rate 8.00%   8.00%