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Supplemental Guarantor Information (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
May 31, 2013
Jan. 29, 2013
Convertible senior notes due February 1, 2019 at 1.375%
May 31, 2013
Convertible Notes Payable [Member]
Convertible senior notes due February 1, 2019 at 1.375%
Jan. 29, 2013
Convertible Notes Payable [Member]
Convertible senior notes due February 1, 2019 at 1.375%
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 230.0 $ 230.0 $ 230.0
Ownership share in guarantor subsidiaries (percent) 100.00%      
Line of credit facility, significant subsidiary threshold, percent 5.00%      
Line of credit facility, non guarantor subsidiary threshold, percent 10.00%