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Fair Value Disclosures (Fair Value Hierarchy, Carrying Values, and Estimated Fair Values of Financial Instruments) (Details) (USD $)
Jan. 29, 2013
Convertible senior notes due February 1, 2019 at 1.375%
May 31, 2013
Carrying Value
Level 2
Nov. 30, 2012
Carrying Value
Level 2
May 31, 2013
Estimate of Fair Value, Fair Value Disclosure [Member]
Level 2
Nov. 30, 2012
Estimate of Fair Value, Fair Value Disclosure [Member]
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated Fair Value   $ 1,671,194,000 $ 1,670,504,000 $ 1,895,795,000 $ 1,831,596,000
Convertible Debt, Fair Value Disclosures   230,000,000 0 265,075,000 0
Debt instrument, face amount $ 230,000,000        
Debt Instrument, Interest Rate, Stated Percentage 1.375%