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Fair Value Disclosures (Details Textual) (USD $)
3 Months Ended 12 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Nov. 30, 2011
Additional Fair Value Disclosures (Textual)      
Pretax, noncash inventory impairment charges $ 6,572,000 $ 992,000 $ 22,700,000
Fair Value Disclosures (Textual) [Abstract]      
Long-lived assets held and used, Carrying Value 18,800,000   56,700,000
Fair Value, Measurements, Nonrecurring [Member]
     
Additional Fair Value Disclosures (Textual)      
Long-lived assets held and used 12,239,000   34,022,000
Estimate of Fair Value, Fair Value Disclosure [Member]
     
Additional Fair Value Disclosures (Textual)      
Long-lived assets held and used $ 12,200,000   $ 34,000,000
Senior notes due 2014 at 5 3/4% [Member]
     
Debt Instrument [Line Items]      
Senior notes, rate 5.75%    
Senior notes due 2015 at 5 7/8% [Member]
     
Debt Instrument [Line Items]      
Senior notes, rate 5.875%    
Senior notes due 2015 at 6 1/4% [Member]
     
Debt Instrument [Line Items]      
Senior notes, rate 6.25%    
Senior notes due 2017 at 9.10% [Member]
     
Debt Instrument [Line Items]      
Senior notes, rate 9.10%    
Senior notes due 2018 at 7 1/4% [Member]
     
Debt Instrument [Line Items]      
Senior notes, rate 7.25%    
Senior notes due 2020 at 8.00% [Member]
     
Debt Instrument [Line Items]      
Senior notes, rate 8.00%